diff --git a/dist/mixpanel.amd.js b/dist/mixpanel.amd.js
index dafe242c..1e8fbb64 100644
--- a/dist/mixpanel.amd.js
+++ b/dist/mixpanel.amd.js
@@ -1220,201 +1220,15 @@ define(function () { 'use strict';
     })();
 
 
-    var TOKEN_MATCH_REGEX = new RegExp('^(\\w*)\\[(\\w+)([=~\\|\\^\\$\\*]?)=?"?([^\\]"]*)"?\\]$');
-
-    _.dom_query = (function() {
-        /* document.getElementsBySelector(selector)
-        - returns an array of element objects from the current document
-        matching the CSS selector. Selectors can contain element names,
-        class names and ids and can be nested. For example:
-
-        elements = document.getElementsBySelector('div#main p a.external')
-
-        Will return an array of all 'a' elements with 'external' in their
-        class attribute that are contained inside 'p' elements that are
-        contained inside the 'div' element which has id="main"
-
-        New in version 0.4: Support for CSS2 and CSS3 attribute selectors:
-        See http://www.w3.org/TR/css3-selectors/#attribute-selectors
-
-        Version 0.4 - Simon Willison, March 25th 2003
-        -- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows
-        -- Opera 7 fails
-
-        Version 0.5 - Carl Sverre, Jan 7th 2013
-        -- Now uses jQuery-esque `hasClass` for testing class name
-        equality.  This fixes a bug related to '-' characters being
-        considered not part of a 'word' in regex.
-        */
-
-        function getAllChildren(e) {
-            // Returns all children of element. Workaround required for IE5/Windows. Ugh.
-            return e.all ? e.all : e.getElementsByTagName('*');
-        }
-
-        var bad_whitespace = /[\t\r\n]/g;
-
-        function hasClass(elem, selector) {
-            var className = ' ' + selector + ' ';
-            return ((' ' + elem.className + ' ').replace(bad_whitespace, ' ').indexOf(className) >= 0);
-        }
-
-        function getElementsBySelector(selector) {
-            // Attempt to fail gracefully in lesser browsers
-            if (!document$1.getElementsByTagName) {
-                return [];
-            }
-            // Split selector in to tokens
-            var tokens = selector.split(' ');
-            var token, bits, tagName, found, foundCount, i, j, k, elements, currentContextIndex;
-            var currentContext = [document$1];
-            for (i = 0; i < tokens.length; i++) {
-                token = tokens[i].replace(/^\s+/, '').replace(/\s+$/, '');
-                if (token.indexOf('#') > -1) {
-                    // Token is an ID selector
-                    bits = token.split('#');
-                    tagName = bits[0];
-                    var id = bits[1];
-                    var element = document$1.getElementById(id);
-                    if (!element || (tagName && element.nodeName.toLowerCase() != tagName)) {
-                        // element not found or tag with that ID not found, return false
-                        return [];
-                    }
-                    // Set currentContext to contain just this element
-                    currentContext = [element];
-                    continue; // Skip to next token
-                }
-                if (token.indexOf('.') > -1) {
-                    // Token contains a class selector
-                    bits = token.split('.');
-                    tagName = bits[0];
-                    var className = bits[1];
-                    if (!tagName) {
-                        tagName = '*';
-                    }
-                    // Get elements matching tag, filter them for class selector
-                    found = [];
-                    foundCount = 0;
-                    for (j = 0; j < currentContext.length; j++) {
-                        if (tagName == '*') {
-                            elements = getAllChildren(currentContext[j]);
-                        } else {
-                            elements = currentContext[j].getElementsByTagName(tagName);
-                        }
-                        for (k = 0; k < elements.length; k++) {
-                            found[foundCount++] = elements[k];
-                        }
-                    }
-                    currentContext = [];
-                    currentContextIndex = 0;
-                    for (j = 0; j < found.length; j++) {
-                        if (found[j].className &&
-                            _.isString(found[j].className) && // some SVG elements have classNames which are not strings
-                            hasClass(found[j], className)
-                        ) {
-                            currentContext[currentContextIndex++] = found[j];
-                        }
-                    }
-                    continue; // Skip to next token
-                }
-                // Code to deal with attribute selectors
-                var token_match = token.match(TOKEN_MATCH_REGEX);
-                if (token_match) {
-                    tagName = token_match[1];
-                    var attrName = token_match[2];
-                    var attrOperator = token_match[3];
-                    var attrValue = token_match[4];
-                    if (!tagName) {
-                        tagName = '*';
-                    }
-                    // Grab all of the tagName elements within current context
-                    found = [];
-                    foundCount = 0;
-                    for (j = 0; j < currentContext.length; j++) {
-                        if (tagName == '*') {
-                            elements = getAllChildren(currentContext[j]);
-                        } else {
-                            elements = currentContext[j].getElementsByTagName(tagName);
-                        }
-                        for (k = 0; k < elements.length; k++) {
-                            found[foundCount++] = elements[k];
-                        }
-                    }
-                    currentContext = [];
-                    currentContextIndex = 0;
-                    var checkFunction; // This function will be used to filter the elements
-                    switch (attrOperator) {
-                        case '=': // Equality
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName) == attrValue);
-                            };
-                            break;
-                        case '~': // Match one of space seperated words
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName).match(new RegExp('\\b' + attrValue + '\\b')));
-                            };
-                            break;
-                        case '|': // Match start with value followed by optional hyphen
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName).match(new RegExp('^' + attrValue + '-?')));
-                            };
-                            break;
-                        case '^': // Match starts with value
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName).indexOf(attrValue) === 0);
-                            };
-                            break;
-                        case '$': // Match ends with value - fails with "Warning" in Opera 7
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length);
-                            };
-                            break;
-                        case '*': // Match ends with value
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName).indexOf(attrValue) > -1);
-                            };
-                            break;
-                        default:
-                            // Just test for existence of attribute
-                            checkFunction = function(e) {
-                                return e.getAttribute(attrName);
-                            };
-                    }
-                    currentContext = [];
-                    currentContextIndex = 0;
-                    for (j = 0; j < found.length; j++) {
-                        if (checkFunction(found[j])) {
-                            currentContext[currentContextIndex++] = found[j];
-                        }
-                    }
-                    // alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue);
-                    continue; // Skip to next token
-                }
-                // If we get here, token is JUST an element (not a class or ID selector)
-                tagName = token;
-                found = [];
-                foundCount = 0;
-                for (j = 0; j < currentContext.length; j++) {
-                    elements = currentContext[j].getElementsByTagName(tagName);
-                    for (k = 0; k < elements.length; k++) {
-                        found[foundCount++] = elements[k];
-                    }
-                }
-                currentContext = found;
-            }
-            return currentContext;
+    _.dom_query = function(query) {
+        if (_.isElement(query)) {
+            return [query];
+        } else if (typeof query === 'string') {
+            return Array.from(document$1.querySelectorAll(query));
+        } else {
+            return query;
         }
-
-        return function(query) {
-            if (_.isElement(query)) {
-                return [query];
-            } else if (_.isObject(query) && !_.isUndefined(query.length)) {
-                return query;
-            } else {
-                return getElementsBySelector.call(this, query);
-            }
-        };
-    })();
+    };
 
     var CAMPAIGN_KEYWORDS = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_content', 'utm_term'];
     var CLICK_IDS = ['dclid', 'fbclid', 'gclid', 'ko_click_id', 'li_fat_id', 'msclkid', 'ttclid', 'twclid', 'wbraid'];
diff --git a/dist/mixpanel.cjs.js b/dist/mixpanel.cjs.js
index a5c6bc67..77700917 100644
--- a/dist/mixpanel.cjs.js
+++ b/dist/mixpanel.cjs.js
@@ -1220,201 +1220,15 @@ _.register_event = (function() {
 })();
 
 
-var TOKEN_MATCH_REGEX = new RegExp('^(\\w*)\\[(\\w+)([=~\\|\\^\\$\\*]?)=?"?([^\\]"]*)"?\\]$');
-
-_.dom_query = (function() {
-    /* document.getElementsBySelector(selector)
-    - returns an array of element objects from the current document
-    matching the CSS selector. Selectors can contain element names,
-    class names and ids and can be nested. For example:
-
-    elements = document.getElementsBySelector('div#main p a.external')
-
-    Will return an array of all 'a' elements with 'external' in their
-    class attribute that are contained inside 'p' elements that are
-    contained inside the 'div' element which has id="main"
-
-    New in version 0.4: Support for CSS2 and CSS3 attribute selectors:
-    See http://www.w3.org/TR/css3-selectors/#attribute-selectors
-
-    Version 0.4 - Simon Willison, March 25th 2003
-    -- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows
-    -- Opera 7 fails
-
-    Version 0.5 - Carl Sverre, Jan 7th 2013
-    -- Now uses jQuery-esque `hasClass` for testing class name
-    equality.  This fixes a bug related to '-' characters being
-    considered not part of a 'word' in regex.
-    */
-
-    function getAllChildren(e) {
-        // Returns all children of element. Workaround required for IE5/Windows. Ugh.
-        return e.all ? e.all : e.getElementsByTagName('*');
-    }
-
-    var bad_whitespace = /[\t\r\n]/g;
-
-    function hasClass(elem, selector) {
-        var className = ' ' + selector + ' ';
-        return ((' ' + elem.className + ' ').replace(bad_whitespace, ' ').indexOf(className) >= 0);
-    }
-
-    function getElementsBySelector(selector) {
-        // Attempt to fail gracefully in lesser browsers
-        if (!document$1.getElementsByTagName) {
-            return [];
-        }
-        // Split selector in to tokens
-        var tokens = selector.split(' ');
-        var token, bits, tagName, found, foundCount, i, j, k, elements, currentContextIndex;
-        var currentContext = [document$1];
-        for (i = 0; i < tokens.length; i++) {
-            token = tokens[i].replace(/^\s+/, '').replace(/\s+$/, '');
-            if (token.indexOf('#') > -1) {
-                // Token is an ID selector
-                bits = token.split('#');
-                tagName = bits[0];
-                var id = bits[1];
-                var element = document$1.getElementById(id);
-                if (!element || (tagName && element.nodeName.toLowerCase() != tagName)) {
-                    // element not found or tag with that ID not found, return false
-                    return [];
-                }
-                // Set currentContext to contain just this element
-                currentContext = [element];
-                continue; // Skip to next token
-            }
-            if (token.indexOf('.') > -1) {
-                // Token contains a class selector
-                bits = token.split('.');
-                tagName = bits[0];
-                var className = bits[1];
-                if (!tagName) {
-                    tagName = '*';
-                }
-                // Get elements matching tag, filter them for class selector
-                found = [];
-                foundCount = 0;
-                for (j = 0; j < currentContext.length; j++) {
-                    if (tagName == '*') {
-                        elements = getAllChildren(currentContext[j]);
-                    } else {
-                        elements = currentContext[j].getElementsByTagName(tagName);
-                    }
-                    for (k = 0; k < elements.length; k++) {
-                        found[foundCount++] = elements[k];
-                    }
-                }
-                currentContext = [];
-                currentContextIndex = 0;
-                for (j = 0; j < found.length; j++) {
-                    if (found[j].className &&
-                        _.isString(found[j].className) && // some SVG elements have classNames which are not strings
-                        hasClass(found[j], className)
-                    ) {
-                        currentContext[currentContextIndex++] = found[j];
-                    }
-                }
-                continue; // Skip to next token
-            }
-            // Code to deal with attribute selectors
-            var token_match = token.match(TOKEN_MATCH_REGEX);
-            if (token_match) {
-                tagName = token_match[1];
-                var attrName = token_match[2];
-                var attrOperator = token_match[3];
-                var attrValue = token_match[4];
-                if (!tagName) {
-                    tagName = '*';
-                }
-                // Grab all of the tagName elements within current context
-                found = [];
-                foundCount = 0;
-                for (j = 0; j < currentContext.length; j++) {
-                    if (tagName == '*') {
-                        elements = getAllChildren(currentContext[j]);
-                    } else {
-                        elements = currentContext[j].getElementsByTagName(tagName);
-                    }
-                    for (k = 0; k < elements.length; k++) {
-                        found[foundCount++] = elements[k];
-                    }
-                }
-                currentContext = [];
-                currentContextIndex = 0;
-                var checkFunction; // This function will be used to filter the elements
-                switch (attrOperator) {
-                    case '=': // Equality
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName) == attrValue);
-                        };
-                        break;
-                    case '~': // Match one of space seperated words
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName).match(new RegExp('\\b' + attrValue + '\\b')));
-                        };
-                        break;
-                    case '|': // Match start with value followed by optional hyphen
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName).match(new RegExp('^' + attrValue + '-?')));
-                        };
-                        break;
-                    case '^': // Match starts with value
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName).indexOf(attrValue) === 0);
-                        };
-                        break;
-                    case '$': // Match ends with value - fails with "Warning" in Opera 7
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length);
-                        };
-                        break;
-                    case '*': // Match ends with value
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName).indexOf(attrValue) > -1);
-                        };
-                        break;
-                    default:
-                        // Just test for existence of attribute
-                        checkFunction = function(e) {
-                            return e.getAttribute(attrName);
-                        };
-                }
-                currentContext = [];
-                currentContextIndex = 0;
-                for (j = 0; j < found.length; j++) {
-                    if (checkFunction(found[j])) {
-                        currentContext[currentContextIndex++] = found[j];
-                    }
-                }
-                // alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue);
-                continue; // Skip to next token
-            }
-            // If we get here, token is JUST an element (not a class or ID selector)
-            tagName = token;
-            found = [];
-            foundCount = 0;
-            for (j = 0; j < currentContext.length; j++) {
-                elements = currentContext[j].getElementsByTagName(tagName);
-                for (k = 0; k < elements.length; k++) {
-                    found[foundCount++] = elements[k];
-                }
-            }
-            currentContext = found;
-        }
-        return currentContext;
+_.dom_query = function(query) {
+    if (_.isElement(query)) {
+        return [query];
+    } else if (typeof query === 'string') {
+        return Array.from(document$1.querySelectorAll(query));
+    } else {
+        return query;
     }
-
-    return function(query) {
-        if (_.isElement(query)) {
-            return [query];
-        } else if (_.isObject(query) && !_.isUndefined(query.length)) {
-            return query;
-        } else {
-            return getElementsBySelector.call(this, query);
-        }
-    };
-})();
+};
 
 var CAMPAIGN_KEYWORDS = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_content', 'utm_term'];
 var CLICK_IDS = ['dclid', 'fbclid', 'gclid', 'ko_click_id', 'li_fat_id', 'msclkid', 'ttclid', 'twclid', 'wbraid'];
diff --git a/dist/mixpanel.globals.js b/dist/mixpanel.globals.js
index ddb8877a..9884348d 100644
--- a/dist/mixpanel.globals.js
+++ b/dist/mixpanel.globals.js
@@ -1221,201 +1221,15 @@
     })();
 
 
-    var TOKEN_MATCH_REGEX = new RegExp('^(\\w*)\\[(\\w+)([=~\\|\\^\\$\\*]?)=?"?([^\\]"]*)"?\\]$');
-
-    _.dom_query = (function() {
-        /* document.getElementsBySelector(selector)
-        - returns an array of element objects from the current document
-        matching the CSS selector. Selectors can contain element names,
-        class names and ids and can be nested. For example:
-
-        elements = document.getElementsBySelector('div#main p a.external')
-
-        Will return an array of all 'a' elements with 'external' in their
-        class attribute that are contained inside 'p' elements that are
-        contained inside the 'div' element which has id="main"
-
-        New in version 0.4: Support for CSS2 and CSS3 attribute selectors:
-        See http://www.w3.org/TR/css3-selectors/#attribute-selectors
-
-        Version 0.4 - Simon Willison, March 25th 2003
-        -- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows
-        -- Opera 7 fails
-
-        Version 0.5 - Carl Sverre, Jan 7th 2013
-        -- Now uses jQuery-esque `hasClass` for testing class name
-        equality.  This fixes a bug related to '-' characters being
-        considered not part of a 'word' in regex.
-        */
-
-        function getAllChildren(e) {
-            // Returns all children of element. Workaround required for IE5/Windows. Ugh.
-            return e.all ? e.all : e.getElementsByTagName('*');
-        }
-
-        var bad_whitespace = /[\t\r\n]/g;
-
-        function hasClass(elem, selector) {
-            var className = ' ' + selector + ' ';
-            return ((' ' + elem.className + ' ').replace(bad_whitespace, ' ').indexOf(className) >= 0);
-        }
-
-        function getElementsBySelector(selector) {
-            // Attempt to fail gracefully in lesser browsers
-            if (!document$1.getElementsByTagName) {
-                return [];
-            }
-            // Split selector in to tokens
-            var tokens = selector.split(' ');
-            var token, bits, tagName, found, foundCount, i, j, k, elements, currentContextIndex;
-            var currentContext = [document$1];
-            for (i = 0; i < tokens.length; i++) {
-                token = tokens[i].replace(/^\s+/, '').replace(/\s+$/, '');
-                if (token.indexOf('#') > -1) {
-                    // Token is an ID selector
-                    bits = token.split('#');
-                    tagName = bits[0];
-                    var id = bits[1];
-                    var element = document$1.getElementById(id);
-                    if (!element || (tagName && element.nodeName.toLowerCase() != tagName)) {
-                        // element not found or tag with that ID not found, return false
-                        return [];
-                    }
-                    // Set currentContext to contain just this element
-                    currentContext = [element];
-                    continue; // Skip to next token
-                }
-                if (token.indexOf('.') > -1) {
-                    // Token contains a class selector
-                    bits = token.split('.');
-                    tagName = bits[0];
-                    var className = bits[1];
-                    if (!tagName) {
-                        tagName = '*';
-                    }
-                    // Get elements matching tag, filter them for class selector
-                    found = [];
-                    foundCount = 0;
-                    for (j = 0; j < currentContext.length; j++) {
-                        if (tagName == '*') {
-                            elements = getAllChildren(currentContext[j]);
-                        } else {
-                            elements = currentContext[j].getElementsByTagName(tagName);
-                        }
-                        for (k = 0; k < elements.length; k++) {
-                            found[foundCount++] = elements[k];
-                        }
-                    }
-                    currentContext = [];
-                    currentContextIndex = 0;
-                    for (j = 0; j < found.length; j++) {
-                        if (found[j].className &&
-                            _.isString(found[j].className) && // some SVG elements have classNames which are not strings
-                            hasClass(found[j], className)
-                        ) {
-                            currentContext[currentContextIndex++] = found[j];
-                        }
-                    }
-                    continue; // Skip to next token
-                }
-                // Code to deal with attribute selectors
-                var token_match = token.match(TOKEN_MATCH_REGEX);
-                if (token_match) {
-                    tagName = token_match[1];
-                    var attrName = token_match[2];
-                    var attrOperator = token_match[3];
-                    var attrValue = token_match[4];
-                    if (!tagName) {
-                        tagName = '*';
-                    }
-                    // Grab all of the tagName elements within current context
-                    found = [];
-                    foundCount = 0;
-                    for (j = 0; j < currentContext.length; j++) {
-                        if (tagName == '*') {
-                            elements = getAllChildren(currentContext[j]);
-                        } else {
-                            elements = currentContext[j].getElementsByTagName(tagName);
-                        }
-                        for (k = 0; k < elements.length; k++) {
-                            found[foundCount++] = elements[k];
-                        }
-                    }
-                    currentContext = [];
-                    currentContextIndex = 0;
-                    var checkFunction; // This function will be used to filter the elements
-                    switch (attrOperator) {
-                        case '=': // Equality
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName) == attrValue);
-                            };
-                            break;
-                        case '~': // Match one of space seperated words
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName).match(new RegExp('\\b' + attrValue + '\\b')));
-                            };
-                            break;
-                        case '|': // Match start with value followed by optional hyphen
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName).match(new RegExp('^' + attrValue + '-?')));
-                            };
-                            break;
-                        case '^': // Match starts with value
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName).indexOf(attrValue) === 0);
-                            };
-                            break;
-                        case '$': // Match ends with value - fails with "Warning" in Opera 7
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length);
-                            };
-                            break;
-                        case '*': // Match ends with value
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName).indexOf(attrValue) > -1);
-                            };
-                            break;
-                        default:
-                            // Just test for existence of attribute
-                            checkFunction = function(e) {
-                                return e.getAttribute(attrName);
-                            };
-                    }
-                    currentContext = [];
-                    currentContextIndex = 0;
-                    for (j = 0; j < found.length; j++) {
-                        if (checkFunction(found[j])) {
-                            currentContext[currentContextIndex++] = found[j];
-                        }
-                    }
-                    // alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue);
-                    continue; // Skip to next token
-                }
-                // If we get here, token is JUST an element (not a class or ID selector)
-                tagName = token;
-                found = [];
-                foundCount = 0;
-                for (j = 0; j < currentContext.length; j++) {
-                    elements = currentContext[j].getElementsByTagName(tagName);
-                    for (k = 0; k < elements.length; k++) {
-                        found[foundCount++] = elements[k];
-                    }
-                }
-                currentContext = found;
-            }
-            return currentContext;
+    _.dom_query = function(query) {
+        if (_.isElement(query)) {
+            return [query];
+        } else if (typeof query === 'string') {
+            return Array.from(document$1.querySelectorAll(query));
+        } else {
+            return query;
         }
-
-        return function(query) {
-            if (_.isElement(query)) {
-                return [query];
-            } else if (_.isObject(query) && !_.isUndefined(query.length)) {
-                return query;
-            } else {
-                return getElementsBySelector.call(this, query);
-            }
-        };
-    })();
+    };
 
     var CAMPAIGN_KEYWORDS = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_content', 'utm_term'];
     var CLICK_IDS = ['dclid', 'fbclid', 'gclid', 'ko_click_id', 'li_fat_id', 'msclkid', 'ttclid', 'twclid', 'wbraid'];
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+b,d.days):("undefined"===typeof b&&(b="None"),c.a(a,function(a,c){if(!this.M.hasOwnProperty(c)||this.M[c]===b)this.M[c]=a},this))};e.prototype.aa=function(a,b){b=ba(b);b.persistent?this.persistence.aa(a):delete this.M[a]};e.prototype.cb=function(a,b){var c={};c[a]=b;this.m(c)};e.prototype.Na=function(a,b,c,e,g,i,j,h){var m=this.J();if(a&&m!==a){if("string"===typeof a&&0===a.indexOf("$device:"))return this.l("distinct_id cannot have $device: prefix"),-1;this.m({$user_id:a})}this.s("$device_id")||this.w({$had_persisted_distinct_id:l,
+$device_id:m},"");a!==m&&a!==this.s("__alias")&&(this.aa("__alias"),this.m({distinct_id:a}));this.Q.rb=l;this.people.ic(b,c,e,g,i,j,h);a!==m&&this.o("$identify",{distinct_id:a,$anon_distinct_id:m},{Sb:l})};e.prototype.reset=function(){this.persistence.clear();this.Q.rb=B;var a=c.Ya();this.w({distinct_id:"$device:"+a,$device_id:a},"")};e.prototype.J=function(){return this.s("distinct_id")};e.prototype.lc=function(a,b){if(a===this.s("$people_distinct_id"))return this.l("Attempting to create alias for existing People user - aborting."),
+-2;var d=this;c.g(b)&&(b=this.J());if(a!==b)return this.cb("__alias",a),this.o("$create_alias",{alias:a,distinct_id:b},{Sb:l},function(){d.Na(a)});this.l("alias matches current distinct_id - skipping api call.");this.Na(a);return-1};e.prototype.Gc=function(a){this.cb("mp_name_tag",a)};e.prototype.Pb=function(a){if(c.e(a))c.extend(this.config,a),a.batch_size&&c.a(this.p,function(a){a.Lb()}),this.c("persistence_name")||(this.config.persistence_name=this.config.cookie_name),this.c("disable_persistence")||
+(this.config.disable_persistence=this.config.disable_cookie),this.persistence&&this.persistence.bc(this.config),H=H||this.c("debug")};e.prototype.c=function(a){return this.config[a]};e.prototype.eb=function(a){var b=(this.config.hooks[a]||Ca).apply(this,I.call(arguments,1));"undefined"===typeof b&&(this.l(a+" hook did not return a value"),b=r);return b};e.prototype.s=function(a){return this.persistence.props[a]};e.prototype.toString=function(){var a=this.c("name");"mixpanel"!==a&&(a="mixpanel."+a);
+return a};e.prototype.ab=function(a){return c.wb(y)||this.Q.qc||c.tb(this.ta,a)};e.prototype.jc=function(){"localStorage"===this.c("opt_out_tracking_persistence_type")&&c.localStorage.oa()&&(!this.ma()&&this.ma({persistence_type:"cookie"})&&this.Bb({enable_persistence:B}),!this.U()&&this.U({persistence_type:"cookie"})&&this.Ra({clear_persistence:B}),this.ib({persistence_type:"cookie",enable_persistence:B}));if(this.U())this.ca({clear_persistence:l});else if(!this.ma()&&(this.c("opt_out_tracking_by_default")||
+c.cookie.get("mp_optout")))c.cookie.remove("mp_optout"),this.Ra({clear_persistence:this.c("opt_out_persistence_by_default")})};e.prototype.ca=function(a){if(a&&a.clear_persistence)a=l;else if(a&&a.enable_persistence)a=B;else return;!this.c("disable_persistence")&&this.persistence.disabled!==a&&this.persistence.Qb(a);a&&c.a(this.p,function(a){a.clear()})};e.prototype.S=function(a,b){b=c.extend({track:c.bind(this.o,this),persistence_type:this.c("opt_out_tracking_persistence_type"),cookie_prefix:this.c("opt_out_tracking_cookie_prefix"),
+cookie_expiration:this.c("cookie_expiration"),cross_site_cookie:this.c("cross_site_cookie"),cross_subdomain_cookie:this.c("cross_subdomain_cookie"),cookie_domain:this.c("cookie_domain"),secure_cookie:this.c("secure_cookie"),ignore_dnt:this.c("ignore_dnt")},b);c.localStorage.oa()||(b.persistence_type="cookie");return a(this.c("token"),{o:b.track,ed:b.track_event_name,fd:b.track_properties,Fb:b.persistence_type,Eb:b.cookie_prefix,kb:b.cookie_domain,lb:b.cookie_expiration,pc:b.cross_site_cookie,mb:b.cross_subdomain_cookie,
+Pc:b.secure_cookie,sb:b.ignore_dnt})};e.prototype.Bb=function(a){a=c.extend({enable_persistence:l},a);this.S(Fa,a);this.ca(a)};e.prototype.Ra=function(a){a=c.extend({clear_persistence:l,delete_user:l},a);a.delete_user&&this.people&&this.people.Aa()&&(this.people.pb(),this.people.hb());this.S(Ga,a);this.ca(a)};e.prototype.ma=function(a){return this.S(Ha,a)};e.prototype.U=function(a){return this.S(ra,a)};e.prototype.ib=function(a){a=c.extend({enable_persistence:l},a);this.S(Ja,a);this.ca(a)};e.prototype.l=
+function(a,b){q.error.apply(q.error,arguments);try{!b&&!(a instanceof Error)&&(a=Error(a)),this.c("error_reporter")(a,b)}catch(c){q.error(c)}};e.prototype.init=e.prototype.Oa;e.prototype.reset=e.prototype.reset;e.prototype.disable=e.prototype.disable;e.prototype.time_event=e.prototype.cd;e.prototype.track=e.prototype.o;e.prototype.track_links=e.prototype.jd;e.prototype.track_forms=e.prototype.hd;e.prototype.track_pageview=e.prototype.Yb;e.prototype.register=e.prototype.m;e.prototype.register_once=
+e.prototype.w;e.prototype.unregister=e.prototype.aa;e.prototype.identify=e.prototype.Na;e.prototype.alias=e.prototype.lc;e.prototype.name_tag=e.prototype.Gc;e.prototype.set_config=e.prototype.Pb;e.prototype.get_config=e.prototype.c;e.prototype.get_property=e.prototype.s;e.prototype.get_distinct_id=e.prototype.J;e.prototype.toString=e.prototype.toString;e.prototype.opt_out_tracking=e.prototype.Ra;e.prototype.opt_in_tracking=e.prototype.Bb;e.prototype.has_opted_out_tracking=e.prototype.U;e.prototype.has_opted_in_tracking=
+e.prototype.ma;e.prototype.clear_opt_in_out_tracking=e.prototype.ib;e.prototype.get_group=e.prototype.wc;e.prototype.set_group=e.prototype.Xc;e.prototype.add_group=e.prototype.kc;e.prototype.remove_group=e.prototype.Mc;e.prototype.track_with_groups=e.prototype.kd;e.prototype.start_batch_senders=e.prototype.Tb;e.prototype.stop_batch_senders=e.prototype.Ub;j.prototype.properties=j.prototype.V;j.prototype.update_search_keyword=j.prototype.cc;j.prototype.update_referrer_info=j.prototype.Wa;j.prototype.get_cross_subdomain=
+j.prototype.vc;j.prototype.clear=j.prototype.clear;var D={};(function(){aa=1;w=t.mixpanel;c.g(w)?q.H('"mixpanel" object not initialized. Ensure you are using the latest version of the Mixpanel JS Library along with the snippet we provide.'):w.__loaded||w.config&&w.persistence?q.H("The Mixpanel library has already been downloaded at least once. Ensure that the Mixpanel code snippet only appears once on the page (and is not double-loaded by a tag manager) in order to avoid errors."):1.1>(w.__SV||0)?
+q.H("Version mismatch; please ensure you're using the latest version of the Mixpanel code snippet."):(c.a(w._i,function(a){a&&c.isArray(a)&&(D[a[a.length-1]]=Q.apply(this,a))}),za(),w.init(),c.a(D,function(a){a.ea()}),ya())})()})();
 })();
diff --git a/dist/mixpanel.umd.js b/dist/mixpanel.umd.js
index 4a4c8f62..fbc28058 100644
--- a/dist/mixpanel.umd.js
+++ b/dist/mixpanel.umd.js
@@ -1224,201 +1224,15 @@
     })();
 
 
-    var TOKEN_MATCH_REGEX = new RegExp('^(\\w*)\\[(\\w+)([=~\\|\\^\\$\\*]?)=?"?([^\\]"]*)"?\\]$');
-
-    _.dom_query = (function() {
-        /* document.getElementsBySelector(selector)
-        - returns an array of element objects from the current document
-        matching the CSS selector. Selectors can contain element names,
-        class names and ids and can be nested. For example:
-
-        elements = document.getElementsBySelector('div#main p a.external')
-
-        Will return an array of all 'a' elements with 'external' in their
-        class attribute that are contained inside 'p' elements that are
-        contained inside the 'div' element which has id="main"
-
-        New in version 0.4: Support for CSS2 and CSS3 attribute selectors:
-        See http://www.w3.org/TR/css3-selectors/#attribute-selectors
-
-        Version 0.4 - Simon Willison, March 25th 2003
-        -- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows
-        -- Opera 7 fails
-
-        Version 0.5 - Carl Sverre, Jan 7th 2013
-        -- Now uses jQuery-esque `hasClass` for testing class name
-        equality.  This fixes a bug related to '-' characters being
-        considered not part of a 'word' in regex.
-        */
-
-        function getAllChildren(e) {
-            // Returns all children of element. Workaround required for IE5/Windows. Ugh.
-            return e.all ? e.all : e.getElementsByTagName('*');
-        }
-
-        var bad_whitespace = /[\t\r\n]/g;
-
-        function hasClass(elem, selector) {
-            var className = ' ' + selector + ' ';
-            return ((' ' + elem.className + ' ').replace(bad_whitespace, ' ').indexOf(className) >= 0);
-        }
-
-        function getElementsBySelector(selector) {
-            // Attempt to fail gracefully in lesser browsers
-            if (!document$1.getElementsByTagName) {
-                return [];
-            }
-            // Split selector in to tokens
-            var tokens = selector.split(' ');
-            var token, bits, tagName, found, foundCount, i, j, k, elements, currentContextIndex;
-            var currentContext = [document$1];
-            for (i = 0; i < tokens.length; i++) {
-                token = tokens[i].replace(/^\s+/, '').replace(/\s+$/, '');
-                if (token.indexOf('#') > -1) {
-                    // Token is an ID selector
-                    bits = token.split('#');
-                    tagName = bits[0];
-                    var id = bits[1];
-                    var element = document$1.getElementById(id);
-                    if (!element || (tagName && element.nodeName.toLowerCase() != tagName)) {
-                        // element not found or tag with that ID not found, return false
-                        return [];
-                    }
-                    // Set currentContext to contain just this element
-                    currentContext = [element];
-                    continue; // Skip to next token
-                }
-                if (token.indexOf('.') > -1) {
-                    // Token contains a class selector
-                    bits = token.split('.');
-                    tagName = bits[0];
-                    var className = bits[1];
-                    if (!tagName) {
-                        tagName = '*';
-                    }
-                    // Get elements matching tag, filter them for class selector
-                    found = [];
-                    foundCount = 0;
-                    for (j = 0; j < currentContext.length; j++) {
-                        if (tagName == '*') {
-                            elements = getAllChildren(currentContext[j]);
-                        } else {
-                            elements = currentContext[j].getElementsByTagName(tagName);
-                        }
-                        for (k = 0; k < elements.length; k++) {
-                            found[foundCount++] = elements[k];
-                        }
-                    }
-                    currentContext = [];
-                    currentContextIndex = 0;
-                    for (j = 0; j < found.length; j++) {
-                        if (found[j].className &&
-                            _.isString(found[j].className) && // some SVG elements have classNames which are not strings
-                            hasClass(found[j], className)
-                        ) {
-                            currentContext[currentContextIndex++] = found[j];
-                        }
-                    }
-                    continue; // Skip to next token
-                }
-                // Code to deal with attribute selectors
-                var token_match = token.match(TOKEN_MATCH_REGEX);
-                if (token_match) {
-                    tagName = token_match[1];
-                    var attrName = token_match[2];
-                    var attrOperator = token_match[3];
-                    var attrValue = token_match[4];
-                    if (!tagName) {
-                        tagName = '*';
-                    }
-                    // Grab all of the tagName elements within current context
-                    found = [];
-                    foundCount = 0;
-                    for (j = 0; j < currentContext.length; j++) {
-                        if (tagName == '*') {
-                            elements = getAllChildren(currentContext[j]);
-                        } else {
-                            elements = currentContext[j].getElementsByTagName(tagName);
-                        }
-                        for (k = 0; k < elements.length; k++) {
-                            found[foundCount++] = elements[k];
-                        }
-                    }
-                    currentContext = [];
-                    currentContextIndex = 0;
-                    var checkFunction; // This function will be used to filter the elements
-                    switch (attrOperator) {
-                        case '=': // Equality
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName) == attrValue);
-                            };
-                            break;
-                        case '~': // Match one of space seperated words
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName).match(new RegExp('\\b' + attrValue + '\\b')));
-                            };
-                            break;
-                        case '|': // Match start with value followed by optional hyphen
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName).match(new RegExp('^' + attrValue + '-?')));
-                            };
-                            break;
-                        case '^': // Match starts with value
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName).indexOf(attrValue) === 0);
-                            };
-                            break;
-                        case '$': // Match ends with value - fails with "Warning" in Opera 7
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length);
-                            };
-                            break;
-                        case '*': // Match ends with value
-                            checkFunction = function(e) {
-                                return (e.getAttribute(attrName).indexOf(attrValue) > -1);
-                            };
-                            break;
-                        default:
-                            // Just test for existence of attribute
-                            checkFunction = function(e) {
-                                return e.getAttribute(attrName);
-                            };
-                    }
-                    currentContext = [];
-                    currentContextIndex = 0;
-                    for (j = 0; j < found.length; j++) {
-                        if (checkFunction(found[j])) {
-                            currentContext[currentContextIndex++] = found[j];
-                        }
-                    }
-                    // alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue);
-                    continue; // Skip to next token
-                }
-                // If we get here, token is JUST an element (not a class or ID selector)
-                tagName = token;
-                found = [];
-                foundCount = 0;
-                for (j = 0; j < currentContext.length; j++) {
-                    elements = currentContext[j].getElementsByTagName(tagName);
-                    for (k = 0; k < elements.length; k++) {
-                        found[foundCount++] = elements[k];
-                    }
-                }
-                currentContext = found;
-            }
-            return currentContext;
+    _.dom_query = function(query) {
+        if (_.isElement(query)) {
+            return [query];
+        } else if (typeof query === 'string') {
+            return Array.from(document$1.querySelectorAll(query));
+        } else {
+            return query;
         }
-
-        return function(query) {
-            if (_.isElement(query)) {
-                return [query];
-            } else if (_.isObject(query) && !_.isUndefined(query.length)) {
-                return query;
-            } else {
-                return getElementsBySelector.call(this, query);
-            }
-        };
-    })();
+    };
 
     var CAMPAIGN_KEYWORDS = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_content', 'utm_term'];
     var CLICK_IDS = ['dclid', 'fbclid', 'gclid', 'ko_click_id', 'li_fat_id', 'msclkid', 'ttclid', 'twclid', 'wbraid'];
diff --git a/examples/commonjs-browserify/bundle.js b/examples/commonjs-browserify/bundle.js
index 6f7e2c78..edc85e26 100644
--- a/examples/commonjs-browserify/bundle.js
+++ b/examples/commonjs-browserify/bundle.js
@@ -1221,201 +1221,15 @@ _.register_event = (function() {
 })();
 
 
-var TOKEN_MATCH_REGEX = new RegExp('^(\\w*)\\[(\\w+)([=~\\|\\^\\$\\*]?)=?"?([^\\]"]*)"?\\]$');
-
-_.dom_query = (function() {
-    /* document.getElementsBySelector(selector)
-    - returns an array of element objects from the current document
-    matching the CSS selector. Selectors can contain element names,
-    class names and ids and can be nested. For example:
-
-    elements = document.getElementsBySelector('div#main p a.external')
-
-    Will return an array of all 'a' elements with 'external' in their
-    class attribute that are contained inside 'p' elements that are
-    contained inside the 'div' element which has id="main"
-
-    New in version 0.4: Support for CSS2 and CSS3 attribute selectors:
-    See http://www.w3.org/TR/css3-selectors/#attribute-selectors
-
-    Version 0.4 - Simon Willison, March 25th 2003
-    -- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows
-    -- Opera 7 fails
-
-    Version 0.5 - Carl Sverre, Jan 7th 2013
-    -- Now uses jQuery-esque `hasClass` for testing class name
-    equality.  This fixes a bug related to '-' characters being
-    considered not part of a 'word' in regex.
-    */
-
-    function getAllChildren(e) {
-        // Returns all children of element. Workaround required for IE5/Windows. Ugh.
-        return e.all ? e.all : e.getElementsByTagName('*');
-    }
-
-    var bad_whitespace = /[\t\r\n]/g;
-
-    function hasClass(elem, selector) {
-        var className = ' ' + selector + ' ';
-        return ((' ' + elem.className + ' ').replace(bad_whitespace, ' ').indexOf(className) >= 0);
-    }
-
-    function getElementsBySelector(selector) {
-        // Attempt to fail gracefully in lesser browsers
-        if (!document$1.getElementsByTagName) {
-            return [];
-        }
-        // Split selector in to tokens
-        var tokens = selector.split(' ');
-        var token, bits, tagName, found, foundCount, i, j, k, elements, currentContextIndex;
-        var currentContext = [document$1];
-        for (i = 0; i < tokens.length; i++) {
-            token = tokens[i].replace(/^\s+/, '').replace(/\s+$/, '');
-            if (token.indexOf('#') > -1) {
-                // Token is an ID selector
-                bits = token.split('#');
-                tagName = bits[0];
-                var id = bits[1];
-                var element = document$1.getElementById(id);
-                if (!element || (tagName && element.nodeName.toLowerCase() != tagName)) {
-                    // element not found or tag with that ID not found, return false
-                    return [];
-                }
-                // Set currentContext to contain just this element
-                currentContext = [element];
-                continue; // Skip to next token
-            }
-            if (token.indexOf('.') > -1) {
-                // Token contains a class selector
-                bits = token.split('.');
-                tagName = bits[0];
-                var className = bits[1];
-                if (!tagName) {
-                    tagName = '*';
-                }
-                // Get elements matching tag, filter them for class selector
-                found = [];
-                foundCount = 0;
-                for (j = 0; j < currentContext.length; j++) {
-                    if (tagName == '*') {
-                        elements = getAllChildren(currentContext[j]);
-                    } else {
-                        elements = currentContext[j].getElementsByTagName(tagName);
-                    }
-                    for (k = 0; k < elements.length; k++) {
-                        found[foundCount++] = elements[k];
-                    }
-                }
-                currentContext = [];
-                currentContextIndex = 0;
-                for (j = 0; j < found.length; j++) {
-                    if (found[j].className &&
-                        _.isString(found[j].className) && // some SVG elements have classNames which are not strings
-                        hasClass(found[j], className)
-                    ) {
-                        currentContext[currentContextIndex++] = found[j];
-                    }
-                }
-                continue; // Skip to next token
-            }
-            // Code to deal with attribute selectors
-            var token_match = token.match(TOKEN_MATCH_REGEX);
-            if (token_match) {
-                tagName = token_match[1];
-                var attrName = token_match[2];
-                var attrOperator = token_match[3];
-                var attrValue = token_match[4];
-                if (!tagName) {
-                    tagName = '*';
-                }
-                // Grab all of the tagName elements within current context
-                found = [];
-                foundCount = 0;
-                for (j = 0; j < currentContext.length; j++) {
-                    if (tagName == '*') {
-                        elements = getAllChildren(currentContext[j]);
-                    } else {
-                        elements = currentContext[j].getElementsByTagName(tagName);
-                    }
-                    for (k = 0; k < elements.length; k++) {
-                        found[foundCount++] = elements[k];
-                    }
-                }
-                currentContext = [];
-                currentContextIndex = 0;
-                var checkFunction; // This function will be used to filter the elements
-                switch (attrOperator) {
-                    case '=': // Equality
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName) == attrValue);
-                        };
-                        break;
-                    case '~': // Match one of space seperated words
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName).match(new RegExp('\\b' + attrValue + '\\b')));
-                        };
-                        break;
-                    case '|': // Match start with value followed by optional hyphen
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName).match(new RegExp('^' + attrValue + '-?')));
-                        };
-                        break;
-                    case '^': // Match starts with value
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName).indexOf(attrValue) === 0);
-                        };
-                        break;
-                    case '$': // Match ends with value - fails with "Warning" in Opera 7
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length);
-                        };
-                        break;
-                    case '*': // Match ends with value
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName).indexOf(attrValue) > -1);
-                        };
-                        break;
-                    default:
-                        // Just test for existence of attribute
-                        checkFunction = function(e) {
-                            return e.getAttribute(attrName);
-                        };
-                }
-                currentContext = [];
-                currentContextIndex = 0;
-                for (j = 0; j < found.length; j++) {
-                    if (checkFunction(found[j])) {
-                        currentContext[currentContextIndex++] = found[j];
-                    }
-                }
-                // alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue);
-                continue; // Skip to next token
-            }
-            // If we get here, token is JUST an element (not a class or ID selector)
-            tagName = token;
-            found = [];
-            foundCount = 0;
-            for (j = 0; j < currentContext.length; j++) {
-                elements = currentContext[j].getElementsByTagName(tagName);
-                for (k = 0; k < elements.length; k++) {
-                    found[foundCount++] = elements[k];
-                }
-            }
-            currentContext = found;
-        }
-        return currentContext;
+_.dom_query = function(query) {
+    if (_.isElement(query)) {
+        return [query];
+    } else if (typeof query === 'string') {
+        return Array.from(document$1.querySelectorAll(query));
+    } else {
+        return query;
     }
-
-    return function(query) {
-        if (_.isElement(query)) {
-            return [query];
-        } else if (_.isObject(query) && !_.isUndefined(query.length)) {
-            return query;
-        } else {
-            return getElementsBySelector.call(this, query);
-        }
-    };
-})();
+};
 
 var CAMPAIGN_KEYWORDS = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_content', 'utm_term'];
 var CLICK_IDS = ['dclid', 'fbclid', 'gclid', 'ko_click_id', 'li_fat_id', 'msclkid', 'ttclid', 'twclid', 'wbraid'];
diff --git a/examples/es2015-babelify/bundle.js b/examples/es2015-babelify/bundle.js
index e0c86ba4..5a0fa1e4 100644
--- a/examples/es2015-babelify/bundle.js
+++ b/examples/es2015-babelify/bundle.js
@@ -5848,200 +5848,15 @@ _.register_event = (function () {
     return register_event;
 })();
 
-var TOKEN_MATCH_REGEX = new RegExp('^(\\w*)\\[(\\w+)([=~\\|\\^\\$\\*]?)=?"?([^\\]"]*)"?\\]$');
-
-_.dom_query = (function () {
-    /* document.getElementsBySelector(selector)
-    - returns an array of element objects from the current document
-    matching the CSS selector. Selectors can contain element names,
-    class names and ids and can be nested. For example:
-     elements = document.getElementsBySelector('div#main p a.external')
-     Will return an array of all 'a' elements with 'external' in their
-    class attribute that are contained inside 'p' elements that are
-    contained inside the 'div' element which has id="main"
-     New in version 0.4: Support for CSS2 and CSS3 attribute selectors:
-    See http://www.w3.org/TR/css3-selectors/#attribute-selectors
-     Version 0.4 - Simon Willison, March 25th 2003
-    -- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows
-    -- Opera 7 fails
-     Version 0.5 - Carl Sverre, Jan 7th 2013
-    -- Now uses jQuery-esque `hasClass` for testing class name
-    equality.  This fixes a bug related to '-' characters being
-    considered not part of a 'word' in regex.
-    */
-
-    function getAllChildren(e) {
-        // Returns all children of element. Workaround required for IE5/Windows. Ugh.
-        return e.all ? e.all : e.getElementsByTagName('*');
-    }
-
-    var bad_whitespace = /[\t\r\n]/g;
-
-    function hasClass(elem, selector) {
-        var className = ' ' + selector + ' ';
-        return (' ' + elem.className + ' ').replace(bad_whitespace, ' ').indexOf(className) >= 0;
-    }
-
-    function getElementsBySelector(selector) {
-        // Attempt to fail gracefully in lesser browsers
-        if (!document.getElementsByTagName) {
-            return [];
-        }
-        // Split selector in to tokens
-        var tokens = selector.split(' ');
-        var token, bits, tagName, found, foundCount, i, j, k, elements, currentContextIndex;
-        var currentContext = [document];
-        for (i = 0; i < tokens.length; i++) {
-            token = tokens[i].replace(/^\s+/, '').replace(/\s+$/, '');
-            if (token.indexOf('#') > -1) {
-                // Token is an ID selector
-                bits = token.split('#');
-                tagName = bits[0];
-                var id = bits[1];
-                var element = document.getElementById(id);
-                if (!element || tagName && element.nodeName.toLowerCase() != tagName) {
-                    // element not found or tag with that ID not found, return false
-                    return [];
-                }
-                // Set currentContext to contain just this element
-                currentContext = [element];
-                continue; // Skip to next token
-            }
-            if (token.indexOf('.') > -1) {
-                // Token contains a class selector
-                bits = token.split('.');
-                tagName = bits[0];
-                var className = bits[1];
-                if (!tagName) {
-                    tagName = '*';
-                }
-                // Get elements matching tag, filter them for class selector
-                found = [];
-                foundCount = 0;
-                for (j = 0; j < currentContext.length; j++) {
-                    if (tagName == '*') {
-                        elements = getAllChildren(currentContext[j]);
-                    } else {
-                        elements = currentContext[j].getElementsByTagName(tagName);
-                    }
-                    for (k = 0; k < elements.length; k++) {
-                        found[foundCount++] = elements[k];
-                    }
-                }
-                currentContext = [];
-                currentContextIndex = 0;
-                for (j = 0; j < found.length; j++) {
-                    if (found[j].className && _.isString(found[j].className) && // some SVG elements have classNames which are not strings
-                    hasClass(found[j], className)) {
-                        currentContext[currentContextIndex++] = found[j];
-                    }
-                }
-                continue; // Skip to next token
-            }
-            // Code to deal with attribute selectors
-            var token_match = token.match(TOKEN_MATCH_REGEX);
-            if (token_match) {
-                tagName = token_match[1];
-                var attrName = token_match[2];
-                var attrOperator = token_match[3];
-                var attrValue = token_match[4];
-                if (!tagName) {
-                    tagName = '*';
-                }
-                // Grab all of the tagName elements within current context
-                found = [];
-                foundCount = 0;
-                for (j = 0; j < currentContext.length; j++) {
-                    if (tagName == '*') {
-                        elements = getAllChildren(currentContext[j]);
-                    } else {
-                        elements = currentContext[j].getElementsByTagName(tagName);
-                    }
-                    for (k = 0; k < elements.length; k++) {
-                        found[foundCount++] = elements[k];
-                    }
-                }
-                currentContext = [];
-                currentContextIndex = 0;
-                var checkFunction; // This function will be used to filter the elements
-                switch (attrOperator) {
-                    case '=':
-                        // Equality
-                        checkFunction = function (e) {
-                            return e.getAttribute(attrName) == attrValue;
-                        };
-                        break;
-                    case '~':
-                        // Match one of space seperated words
-                        checkFunction = function (e) {
-                            return e.getAttribute(attrName).match(new RegExp('\\b' + attrValue + '\\b'));
-                        };
-                        break;
-                    case '|':
-                        // Match start with value followed by optional hyphen
-                        checkFunction = function (e) {
-                            return e.getAttribute(attrName).match(new RegExp('^' + attrValue + '-?'));
-                        };
-                        break;
-                    case '^':
-                        // Match starts with value
-                        checkFunction = function (e) {
-                            return e.getAttribute(attrName).indexOf(attrValue) === 0;
-                        };
-                        break;
-                    case '$':
-                        // Match ends with value - fails with "Warning" in Opera 7
-                        checkFunction = function (e) {
-                            return e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length;
-                        };
-                        break;
-                    case '*':
-                        // Match ends with value
-                        checkFunction = function (e) {
-                            return e.getAttribute(attrName).indexOf(attrValue) > -1;
-                        };
-                        break;
-                    default:
-                        // Just test for existence of attribute
-                        checkFunction = function (e) {
-                            return e.getAttribute(attrName);
-                        };
-                }
-                currentContext = [];
-                currentContextIndex = 0;
-                for (j = 0; j < found.length; j++) {
-                    if (checkFunction(found[j])) {
-                        currentContext[currentContextIndex++] = found[j];
-                    }
-                }
-                // alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue);
-                continue; // Skip to next token
-            }
-            // If we get here, token is JUST an element (not a class or ID selector)
-            tagName = token;
-            found = [];
-            foundCount = 0;
-            for (j = 0; j < currentContext.length; j++) {
-                elements = currentContext[j].getElementsByTagName(tagName);
-                for (k = 0; k < elements.length; k++) {
-                    found[foundCount++] = elements[k];
-                }
-            }
-            currentContext = found;
-        }
-        return currentContext;
+_.dom_query = function (query) {
+    if (_.isElement(query)) {
+        return [query];
+    } else if (typeof query === 'string') {
+        return Array.from(document.querySelectorAll(query));
+    } else {
+        return query;
     }
-
-    return function (query) {
-        if (_.isElement(query)) {
-            return [query];
-        } else if (_.isObject(query) && !_.isUndefined(query.length)) {
-            return query;
-        } else {
-            return getElementsBySelector.call(this, query);
-        }
-    };
-})();
+};
 
 var CAMPAIGN_KEYWORDS = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_content', 'utm_term'];
 var CLICK_IDS = ['dclid', 'fbclid', 'gclid', 'ko_click_id', 'li_fat_id', 'msclkid', 'ttclid', 'twclid', 'wbraid'];
diff --git a/examples/umd-webpack/bundle.js b/examples/umd-webpack/bundle.js
index 3fcdc05b..c9003750 100644
--- a/examples/umd-webpack/bundle.js
+++ b/examples/umd-webpack/bundle.js
@@ -1287,201 +1287,15 @@
 	    })();
 
 
-	    var TOKEN_MATCH_REGEX = new RegExp('^(\\w*)\\[(\\w+)([=~\\|\\^\\$\\*]?)=?"?([^\\]"]*)"?\\]$');
-
-	    _.dom_query = (function() {
-	        /* document.getElementsBySelector(selector)
-	        - returns an array of element objects from the current document
-	        matching the CSS selector. Selectors can contain element names,
-	        class names and ids and can be nested. For example:
-
-	        elements = document.getElementsBySelector('div#main p a.external')
-
-	        Will return an array of all 'a' elements with 'external' in their
-	        class attribute that are contained inside 'p' elements that are
-	        contained inside the 'div' element which has id="main"
-
-	        New in version 0.4: Support for CSS2 and CSS3 attribute selectors:
-	        See http://www.w3.org/TR/css3-selectors/#attribute-selectors
-
-	        Version 0.4 - Simon Willison, March 25th 2003
-	        -- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows
-	        -- Opera 7 fails
-
-	        Version 0.5 - Carl Sverre, Jan 7th 2013
-	        -- Now uses jQuery-esque `hasClass` for testing class name
-	        equality.  This fixes a bug related to '-' characters being
-	        considered not part of a 'word' in regex.
-	        */
-
-	        function getAllChildren(e) {
-	            // Returns all children of element. Workaround required for IE5/Windows. Ugh.
-	            return e.all ? e.all : e.getElementsByTagName('*');
-	        }
-
-	        var bad_whitespace = /[\t\r\n]/g;
-
-	        function hasClass(elem, selector) {
-	            var className = ' ' + selector + ' ';
-	            return ((' ' + elem.className + ' ').replace(bad_whitespace, ' ').indexOf(className) >= 0);
-	        }
-
-	        function getElementsBySelector(selector) {
-	            // Attempt to fail gracefully in lesser browsers
-	            if (!document$1.getElementsByTagName) {
-	                return [];
-	            }
-	            // Split selector in to tokens
-	            var tokens = selector.split(' ');
-	            var token, bits, tagName, found, foundCount, i, j, k, elements, currentContextIndex;
-	            var currentContext = [document$1];
-	            for (i = 0; i < tokens.length; i++) {
-	                token = tokens[i].replace(/^\s+/, '').replace(/\s+$/, '');
-	                if (token.indexOf('#') > -1) {
-	                    // Token is an ID selector
-	                    bits = token.split('#');
-	                    tagName = bits[0];
-	                    var id = bits[1];
-	                    var element = document$1.getElementById(id);
-	                    if (!element || (tagName && element.nodeName.toLowerCase() != tagName)) {
-	                        // element not found or tag with that ID not found, return false
-	                        return [];
-	                    }
-	                    // Set currentContext to contain just this element
-	                    currentContext = [element];
-	                    continue; // Skip to next token
-	                }
-	                if (token.indexOf('.') > -1) {
-	                    // Token contains a class selector
-	                    bits = token.split('.');
-	                    tagName = bits[0];
-	                    var className = bits[1];
-	                    if (!tagName) {
-	                        tagName = '*';
-	                    }
-	                    // Get elements matching tag, filter them for class selector
-	                    found = [];
-	                    foundCount = 0;
-	                    for (j = 0; j < currentContext.length; j++) {
-	                        if (tagName == '*') {
-	                            elements = getAllChildren(currentContext[j]);
-	                        } else {
-	                            elements = currentContext[j].getElementsByTagName(tagName);
-	                        }
-	                        for (k = 0; k < elements.length; k++) {
-	                            found[foundCount++] = elements[k];
-	                        }
-	                    }
-	                    currentContext = [];
-	                    currentContextIndex = 0;
-	                    for (j = 0; j < found.length; j++) {
-	                        if (found[j].className &&
-	                            _.isString(found[j].className) && // some SVG elements have classNames which are not strings
-	                            hasClass(found[j], className)
-	                        ) {
-	                            currentContext[currentContextIndex++] = found[j];
-	                        }
-	                    }
-	                    continue; // Skip to next token
-	                }
-	                // Code to deal with attribute selectors
-	                var token_match = token.match(TOKEN_MATCH_REGEX);
-	                if (token_match) {
-	                    tagName = token_match[1];
-	                    var attrName = token_match[2];
-	                    var attrOperator = token_match[3];
-	                    var attrValue = token_match[4];
-	                    if (!tagName) {
-	                        tagName = '*';
-	                    }
-	                    // Grab all of the tagName elements within current context
-	                    found = [];
-	                    foundCount = 0;
-	                    for (j = 0; j < currentContext.length; j++) {
-	                        if (tagName == '*') {
-	                            elements = getAllChildren(currentContext[j]);
-	                        } else {
-	                            elements = currentContext[j].getElementsByTagName(tagName);
-	                        }
-	                        for (k = 0; k < elements.length; k++) {
-	                            found[foundCount++] = elements[k];
-	                        }
-	                    }
-	                    currentContext = [];
-	                    currentContextIndex = 0;
-	                    var checkFunction; // This function will be used to filter the elements
-	                    switch (attrOperator) {
-	                        case '=': // Equality
-	                            checkFunction = function(e) {
-	                                return (e.getAttribute(attrName) == attrValue);
-	                            };
-	                            break;
-	                        case '~': // Match one of space seperated words
-	                            checkFunction = function(e) {
-	                                return (e.getAttribute(attrName).match(new RegExp('\\b' + attrValue + '\\b')));
-	                            };
-	                            break;
-	                        case '|': // Match start with value followed by optional hyphen
-	                            checkFunction = function(e) {
-	                                return (e.getAttribute(attrName).match(new RegExp('^' + attrValue + '-?')));
-	                            };
-	                            break;
-	                        case '^': // Match starts with value
-	                            checkFunction = function(e) {
-	                                return (e.getAttribute(attrName).indexOf(attrValue) === 0);
-	                            };
-	                            break;
-	                        case '$': // Match ends with value - fails with "Warning" in Opera 7
-	                            checkFunction = function(e) {
-	                                return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length);
-	                            };
-	                            break;
-	                        case '*': // Match ends with value
-	                            checkFunction = function(e) {
-	                                return (e.getAttribute(attrName).indexOf(attrValue) > -1);
-	                            };
-	                            break;
-	                        default:
-	                            // Just test for existence of attribute
-	                            checkFunction = function(e) {
-	                                return e.getAttribute(attrName);
-	                            };
-	                    }
-	                    currentContext = [];
-	                    currentContextIndex = 0;
-	                    for (j = 0; j < found.length; j++) {
-	                        if (checkFunction(found[j])) {
-	                            currentContext[currentContextIndex++] = found[j];
-	                        }
-	                    }
-	                    // alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue);
-	                    continue; // Skip to next token
-	                }
-	                // If we get here, token is JUST an element (not a class or ID selector)
-	                tagName = token;
-	                found = [];
-	                foundCount = 0;
-	                for (j = 0; j < currentContext.length; j++) {
-	                    elements = currentContext[j].getElementsByTagName(tagName);
-	                    for (k = 0; k < elements.length; k++) {
-	                        found[foundCount++] = elements[k];
-	                    }
-	                }
-	                currentContext = found;
-	            }
-	            return currentContext;
+	    _.dom_query = function(query) {
+	        if (_.isElement(query)) {
+	            return [query];
+	        } else if (typeof query === 'string') {
+	            return Array.from(document$1.querySelectorAll(query));
+	        } else {
+	            return query;
 	        }
-
-	        return function(query) {
-	            if (_.isElement(query)) {
-	                return [query];
-	            } else if (_.isObject(query) && !_.isUndefined(query.length)) {
-	                return query;
-	            } else {
-	                return getElementsBySelector.call(this, query);
-	            }
-	        };
-	    })();
+	    };
 
 	    var CAMPAIGN_KEYWORDS = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_content', 'utm_term'];
 	    var CLICK_IDS = ['dclid', 'fbclid', 'gclid', 'ko_click_id', 'li_fat_id', 'msclkid', 'ttclid', 'twclid', 'wbraid'];
diff --git a/src/utils.js b/src/utils.js
index f5acbb57..642f3478 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -1218,201 +1218,15 @@ _.register_event = (function() {
 })();
 
 
-var TOKEN_MATCH_REGEX = new RegExp('^(\\w*)\\[(\\w+)([=~\\|\\^\\$\\*]?)=?"?([^\\]"]*)"?\\]$');
-
-_.dom_query = (function() {
-    /* document.getElementsBySelector(selector)
-    - returns an array of element objects from the current document
-    matching the CSS selector. Selectors can contain element names,
-    class names and ids and can be nested. For example:
-
-    elements = document.getElementsBySelector('div#main p a.external')
-
-    Will return an array of all 'a' elements with 'external' in their
-    class attribute that are contained inside 'p' elements that are
-    contained inside the 'div' element which has id="main"
-
-    New in version 0.4: Support for CSS2 and CSS3 attribute selectors:
-    See http://www.w3.org/TR/css3-selectors/#attribute-selectors
-
-    Version 0.4 - Simon Willison, March 25th 2003
-    -- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows
-    -- Opera 7 fails
-
-    Version 0.5 - Carl Sverre, Jan 7th 2013
-    -- Now uses jQuery-esque `hasClass` for testing class name
-    equality.  This fixes a bug related to '-' characters being
-    considered not part of a 'word' in regex.
-    */
-
-    function getAllChildren(e) {
-        // Returns all children of element. Workaround required for IE5/Windows. Ugh.
-        return e.all ? e.all : e.getElementsByTagName('*');
-    }
-
-    var bad_whitespace = /[\t\r\n]/g;
-
-    function hasClass(elem, selector) {
-        var className = ' ' + selector + ' ';
-        return ((' ' + elem.className + ' ').replace(bad_whitespace, ' ').indexOf(className) >= 0);
-    }
-
-    function getElementsBySelector(selector) {
-        // Attempt to fail gracefully in lesser browsers
-        if (!document.getElementsByTagName) {
-            return [];
-        }
-        // Split selector in to tokens
-        var tokens = selector.split(' ');
-        var token, bits, tagName, found, foundCount, i, j, k, elements, currentContextIndex;
-        var currentContext = [document];
-        for (i = 0; i < tokens.length; i++) {
-            token = tokens[i].replace(/^\s+/, '').replace(/\s+$/, '');
-            if (token.indexOf('#') > -1) {
-                // Token is an ID selector
-                bits = token.split('#');
-                tagName = bits[0];
-                var id = bits[1];
-                var element = document.getElementById(id);
-                if (!element || (tagName && element.nodeName.toLowerCase() != tagName)) {
-                    // element not found or tag with that ID not found, return false
-                    return [];
-                }
-                // Set currentContext to contain just this element
-                currentContext = [element];
-                continue; // Skip to next token
-            }
-            if (token.indexOf('.') > -1) {
-                // Token contains a class selector
-                bits = token.split('.');
-                tagName = bits[0];
-                var className = bits[1];
-                if (!tagName) {
-                    tagName = '*';
-                }
-                // Get elements matching tag, filter them for class selector
-                found = [];
-                foundCount = 0;
-                for (j = 0; j < currentContext.length; j++) {
-                    if (tagName == '*') {
-                        elements = getAllChildren(currentContext[j]);
-                    } else {
-                        elements = currentContext[j].getElementsByTagName(tagName);
-                    }
-                    for (k = 0; k < elements.length; k++) {
-                        found[foundCount++] = elements[k];
-                    }
-                }
-                currentContext = [];
-                currentContextIndex = 0;
-                for (j = 0; j < found.length; j++) {
-                    if (found[j].className &&
-                        _.isString(found[j].className) && // some SVG elements have classNames which are not strings
-                        hasClass(found[j], className)
-                    ) {
-                        currentContext[currentContextIndex++] = found[j];
-                    }
-                }
-                continue; // Skip to next token
-            }
-            // Code to deal with attribute selectors
-            var token_match = token.match(TOKEN_MATCH_REGEX);
-            if (token_match) {
-                tagName = token_match[1];
-                var attrName = token_match[2];
-                var attrOperator = token_match[3];
-                var attrValue = token_match[4];
-                if (!tagName) {
-                    tagName = '*';
-                }
-                // Grab all of the tagName elements within current context
-                found = [];
-                foundCount = 0;
-                for (j = 0; j < currentContext.length; j++) {
-                    if (tagName == '*') {
-                        elements = getAllChildren(currentContext[j]);
-                    } else {
-                        elements = currentContext[j].getElementsByTagName(tagName);
-                    }
-                    for (k = 0; k < elements.length; k++) {
-                        found[foundCount++] = elements[k];
-                    }
-                }
-                currentContext = [];
-                currentContextIndex = 0;
-                var checkFunction; // This function will be used to filter the elements
-                switch (attrOperator) {
-                    case '=': // Equality
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName) == attrValue);
-                        };
-                        break;
-                    case '~': // Match one of space seperated words
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName).match(new RegExp('\\b' + attrValue + '\\b')));
-                        };
-                        break;
-                    case '|': // Match start with value followed by optional hyphen
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName).match(new RegExp('^' + attrValue + '-?')));
-                        };
-                        break;
-                    case '^': // Match starts with value
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName).indexOf(attrValue) === 0);
-                        };
-                        break;
-                    case '$': // Match ends with value - fails with "Warning" in Opera 7
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length);
-                        };
-                        break;
-                    case '*': // Match ends with value
-                        checkFunction = function(e) {
-                            return (e.getAttribute(attrName).indexOf(attrValue) > -1);
-                        };
-                        break;
-                    default:
-                        // Just test for existence of attribute
-                        checkFunction = function(e) {
-                            return e.getAttribute(attrName);
-                        };
-                }
-                currentContext = [];
-                currentContextIndex = 0;
-                for (j = 0; j < found.length; j++) {
-                    if (checkFunction(found[j])) {
-                        currentContext[currentContextIndex++] = found[j];
-                    }
-                }
-                // alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue);
-                continue; // Skip to next token
-            }
-            // If we get here, token is JUST an element (not a class or ID selector)
-            tagName = token;
-            found = [];
-            foundCount = 0;
-            for (j = 0; j < currentContext.length; j++) {
-                elements = currentContext[j].getElementsByTagName(tagName);
-                for (k = 0; k < elements.length; k++) {
-                    found[foundCount++] = elements[k];
-                }
-            }
-            currentContext = found;
-        }
-        return currentContext;
+_.dom_query = function(query) {
+    if (_.isElement(query)) {
+        return [query];
+    } else if (typeof query === 'string') {
+        return Array.from(document.querySelectorAll(query));
+    } else {
+        return query;
     }
-
-    return function(query) {
-        if (_.isElement(query)) {
-            return [query];
-        } else if (_.isObject(query) && !_.isUndefined(query.length)) {
-            return query;
-        } else {
-            return getElementsBySelector.call(this, query);
-        }
-    };
-})();
+};
 
 var CAMPAIGN_KEYWORDS = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_content', 'utm_term'];
 var CLICK_IDS = ['dclid', 'fbclid', 'gclid', 'ko_click_id', 'li_fat_id', 'msclkid', 'ttclid', 'twclid', 'wbraid'];