diff --git a/bower.json b/bower.json
index 9df221b4..f58b22f8 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "react-modal",
-  "version": "2.3.3",
+  "version": "3.0.0-alpha",
   "homepage": "https://github.com/reactjs/react-modal",
   "authors": [
     "Ryan Florence",
diff --git a/dist/react-modal.js b/dist/react-modal.js
index efd4d229..b04a7e0a 100644
--- a/dist/react-modal.js
+++ b/dist/react-modal.js
@@ -530,6 +530,8 @@ var _extends = Object.assign || function (target) { for (var i = 1; i < argument
 
 var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
 
+var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
+
 var _react = __webpack_require__(3);
 
 var _react2 = _interopRequireDefault(_react);
@@ -567,7 +569,9 @@ function _inherits(subClass, superClass) { if (typeof superClass !== "function"
 var portalClassName = exports.portalClassName = 'ReactModalPortal';
 var bodyOpenClassName = exports.bodyOpenClassName = 'ReactModal__Body--open';
 
-var renderSubtreeIntoContainer = _reactDom2.default.unstable_renderSubtreeIntoContainer;
+var canUseDOM = (typeof window === 'undefined' ? 'undefined' : _typeof(window)) !== undefined;
+var isReact16 = _reactDom2.default.createPortal !== undefined;
+var createPortal = isReact16 ? _reactDom2.default.createPortal : _reactDom2.default.unstable_renderSubtreeIntoContainer;
 
 function getParentElement(parentSelector) {
   return parentSelector();
@@ -588,28 +592,32 @@ var Modal = function (_Component) {
     }
 
     return _ret = (_temp = (_this = _possibleConstructorReturn(this, (_ref = Modal.__proto__ || Object.getPrototypeOf(Modal)).call.apply(_ref, [this].concat(args))), _this), _this.removePortal = function () {
-      _reactDom2.default.unmountComponentAtNode(_this.node);
+      !isReact16 && _reactDom2.default.unmountComponentAtNode(_this.node);
       var parent = getParentElement(_this.props.parentSelector);
       parent.removeChild(_this.node);
+    }, _this.portalRef = function (ref) {
+      _this.portal = ref;
     }, _this.renderPortal = function (props) {
-      _this.portal = renderSubtreeIntoContainer(_this, _react2.default.createElement(_ModalPortal2.default, _extends({ defaultStyles: Modal.defaultStyles }, props)), _this.node);
+      var portal = createPortal(_this, _react2.default.createElement(_ModalPortal2.default, _extends({ defaultStyles: Modal.defaultStyles }, props)), _this.node);
+      _this.portalRef(portal);
     }, _temp), _possibleConstructorReturn(_this, _ret);
   }
 
   _createClass(Modal, [{
     key: 'componentDidMount',
     value: function componentDidMount() {
-      this.node = document.createElement('div');
+      if (!canUseDOM) return;
       this.node.className = this.props.portalClassName;
 
       var parent = getParentElement(this.props.parentSelector);
       parent.appendChild(this.node);
 
-      this.renderPortal(this.props);
+      !isReact16 && this.renderPortal(this.props);
     }
   }, {
     key: 'componentWillReceiveProps',
     value: function componentWillReceiveProps(newProps) {
+      if (!canUseDOM) return;
       var isOpen = newProps.isOpen;
       // Stop unnecessary renders if modal is remaining closed
 
@@ -623,11 +631,12 @@ var Modal = function (_Component) {
         newParent.appendChild(this.node);
       }
 
-      this.renderPortal(newProps);
+      !isReact16 && this.renderPortal(newProps);
     }
   }, {
     key: 'componentWillUpdate',
     value: function componentWillUpdate(newProps) {
+      if (!canUseDOM) return;
       if (newProps.portalClassName !== this.props.portalClassName) {
         this.node.className = newProps.portalClassName;
       }
@@ -635,7 +644,7 @@ var Modal = function (_Component) {
   }, {
     key: 'componentWillUnmount',
     value: function componentWillUnmount() {
-      if (!this.node || !this.portal) return;
+      if (!canUseDOM || !this.node || !this.portal) return;
 
       var state = this.portal.state;
       var now = Date.now();
@@ -654,7 +663,17 @@ var Modal = function (_Component) {
   }, {
     key: 'render',
     value: function render() {
-      return null;
+      if (!canUseDOM || !isReact16) {
+        return null;
+      }
+
+      if (!this.node) {
+        this.node = document.createElement('div');
+      }
+
+      return createPortal(_react2.default.createElement(_ModalPortal2.default, _extends({ ref: this.portalRef,
+        defaultStyles: Modal.defaultStyles
+      }, this.props)), this.node);
     }
   }], [{
     key: 'setAppElement',
diff --git a/dist/react-modal.min.js b/dist/react-modal.min.js
index 07d1cd95..799c6a42 100644
--- a/dist/react-modal.min.js
+++ b/dist/react-modal.min.js
@@ -1,4 +1,4 @@
-!function(e,t){"object"==typeof exports&&"object"==typeof module?module.exports=t(require("react"),require("react-dom")):"function"==typeof define&&define.amd?define(["react","react-dom"],t):"object"==typeof exports?exports.ReactModal=t(require("react"),require("react-dom")):e.ReactModal=t(e.React,e.ReactDOM)}(this,function(e,t){return function(e){function t(o){if(n[o])return n[o].exports;var r=n[o]={i:o,l:!1,exports:{}};return e[o].call(r.exports,r,r.exports,t),r.l=!0,r.exports}var n={};return t.m=e,t.c=n,t.d=function(e,n,o){t.o(e,n)||Object.defineProperty(e,n,{configurable:!1,enumerable:!0,get:o})},t.n=function(e){var n=e&&e.__esModule?function(){return e.default}:function(){return e};return t.d(n,"a",n),n},t.o=function(e,t){return Object.prototype.hasOwnProperty.call(e,t)},t.p="/",t(t.s=10)}([function(e,t,n){"use strict";function o(e){return function(){return e}}var r=function(){};r.thatReturns=o,r.thatReturnsFalse=o(!1),r.thatReturnsTrue=o(!0),r.thatReturnsNull=o(null),r.thatReturnsThis=function(){return this},r.thatReturnsArgument=function(e){return e},e.exports=r},function(e,t,n){"use strict";function o(e,t,n,o,a,u,i,s){if(r(t),!e){var l;if(void 0===t)l=new Error("Minified exception occurred; use the non-minified dev environment for the full error message and additional helpful warnings.");else{var c=[n,o,a,u,i,s],f=0;l=new Error(t.replace(/%s/g,function(){return c[f++]})),l.name="Invariant Violation"}throw l.framesToPop=1,l}}var r=function(e){};r=function(e){if(void 0===e)throw new Error("invariant requires an error message argument")},e.exports=o},function(e,t,n){"use strict";e.exports="SECRET_DO_NOT_PASS_THIS_OR_YOU_WILL_BE_FIRED"},function(t,n){t.exports=e},function(e,t,n){var o="function"==typeof Symbol&&Symbol.for&&Symbol.for("react.element")||60103,r=function(e){return"object"==typeof e&&null!==e&&e.$$typeof===o};e.exports=n(13)(r,!0)},function(e,t,n){"use strict";var o=n(0),r=o,a=function(e){for(var t=arguments.length,n=Array(t>1?t-1:0),o=1;o<t;o++)n[o-1]=arguments[o];var r=0,a="Warning: "+e.replace(/%s/g,function(){return n[r++]});"undefined"!=typeof console&&console.error(a);try{throw new Error(a)}catch(e){}};r=function(e,t){if(void 0===t)throw new Error("`warning(condition, format, ...args)` requires a warning message argument");if(0!==t.indexOf("Failed Composite propType: ")&&!e){for(var n=arguments.length,o=Array(n>2?n-2:0),r=2;r<n;r++)o[r-2]=arguments[r];a.apply(void 0,[t].concat(o))}},e.exports=r},function(e,t,n){"use strict";function o(e){return e.offsetWidth<=0&&e.offsetHeight<=0||"none"===e.style.display}function r(e){for(var t=e;t&&t!==document.body;){if(o(t))return!1;t=t.parentNode}return!0}function a(e,t){var n=e.nodeName.toLowerCase();return(s.test(n)&&!e.disabled||("a"===n?e.href||t:t))&&r(e)}function u(e){var t=e.getAttribute("tabindex");null===t&&(t=void 0);var n=isNaN(t);return(n||t>=0)&&a(e,!n)}function i(e){return[].slice.call(e.querySelectorAll("*"),0).filter(u)}Object.defineProperty(t,"__esModule",{value:!0}),t.default=i;/*!
+!function(e,t){"object"==typeof exports&&"object"==typeof module?module.exports=t(require("react"),require("react-dom")):"function"==typeof define&&define.amd?define(["react","react-dom"],t):"object"==typeof exports?exports.ReactModal=t(require("react"),require("react-dom")):e.ReactModal=t(e.React,e.ReactDOM)}(this,function(e,t){return function(e){function t(o){if(n[o])return n[o].exports;var r=n[o]={i:o,l:!1,exports:{}};return e[o].call(r.exports,r,r.exports,t),r.l=!0,r.exports}var n={};return t.m=e,t.c=n,t.d=function(e,n,o){t.o(e,n)||Object.defineProperty(e,n,{configurable:!1,enumerable:!0,get:o})},t.n=function(e){var n=e&&e.__esModule?function(){return e.default}:function(){return e};return t.d(n,"a",n),n},t.o=function(e,t){return Object.prototype.hasOwnProperty.call(e,t)},t.p="/",t(t.s=10)}([function(e,t,n){"use strict";function o(e){return function(){return e}}var r=function(){};r.thatReturns=o,r.thatReturnsFalse=o(!1),r.thatReturnsTrue=o(!0),r.thatReturnsNull=o(null),r.thatReturnsThis=function(){return this},r.thatReturnsArgument=function(e){return e},e.exports=r},function(e,t,n){"use strict";function o(e,t,n,o,a,i,u,s){if(r(t),!e){var l;if(void 0===t)l=new Error("Minified exception occurred; use the non-minified dev environment for the full error message and additional helpful warnings.");else{var c=[n,o,a,i,u,s],f=0;l=new Error(t.replace(/%s/g,function(){return c[f++]})),l.name="Invariant Violation"}throw l.framesToPop=1,l}}var r=function(e){};r=function(e){if(void 0===e)throw new Error("invariant requires an error message argument")},e.exports=o},function(e,t,n){"use strict";e.exports="SECRET_DO_NOT_PASS_THIS_OR_YOU_WILL_BE_FIRED"},function(t,n){t.exports=e},function(e,t,n){var o="function"==typeof Symbol&&Symbol.for&&Symbol.for("react.element")||60103,r=function(e){return"object"==typeof e&&null!==e&&e.$$typeof===o};e.exports=n(13)(r,!0)},function(e,t,n){"use strict";var o=n(0),r=o,a=function(e){for(var t=arguments.length,n=Array(t>1?t-1:0),o=1;o<t;o++)n[o-1]=arguments[o];var r=0,a="Warning: "+e.replace(/%s/g,function(){return n[r++]});"undefined"!=typeof console&&console.error(a);try{throw new Error(a)}catch(e){}};r=function(e,t){if(void 0===t)throw new Error("`warning(condition, format, ...args)` requires a warning message argument");if(0!==t.indexOf("Failed Composite propType: ")&&!e){for(var n=arguments.length,o=Array(n>2?n-2:0),r=2;r<n;r++)o[r-2]=arguments[r];a.apply(void 0,[t].concat(o))}},e.exports=r},function(e,t,n){"use strict";function o(e){return e.offsetWidth<=0&&e.offsetHeight<=0||"none"===e.style.display}function r(e){for(var t=e;t&&t!==document.body;){if(o(t))return!1;t=t.parentNode}return!0}function a(e,t){var n=e.nodeName.toLowerCase();return(s.test(n)&&!e.disabled||("a"===n?e.href||t:t))&&r(e)}function i(e){var t=e.getAttribute("tabindex");null===t&&(t=void 0);var n=isNaN(t);return(n||t>=0)&&a(e,!n)}function u(e){return[].slice.call(e.querySelectorAll("*"),0).filter(i)}Object.defineProperty(t,"__esModule",{value:!0}),t.default=u;/*!
  * Adapted from jQuery UI core
  *
  * http://jqueryui.com
@@ -9,12 +9,12 @@
  *
  * http://api.jqueryui.com/category/ui-core/
  */
-var s=/input|select|textarea|button|object/;e.exports=t.default},function(e,t,n){"use strict";function o(e,t){if(!e||!e.length)throw new Error("react-modal: No elements were found for selector "+t+".")}function r(e){var t=e;if("string"==typeof t){var n=document.querySelectorAll(t);o(n,t),t="length"in n?n[0]:n}return f=t||f}function a(){return!(!document||!document.body)&&(r(document.body),!0)}function u(e){if(!e&&!f&&!a())throw new Error(["react-modal: Cannot fallback to `document.body`, because it's not ready or available.","If you are doing server-side rendering, use this function to defined an element.","`Modal.setAppElement(el)` to make this accessible"])}function i(e){u(e),(e||f).setAttribute("aria-hidden","true")}function s(e){u(e),(e||f).removeAttribute("aria-hidden")}function l(){f=null}function c(){f=document.body}Object.defineProperty(t,"__esModule",{value:!0}),t.assertNodeList=o,t.setElement=r,t.tryForceFallback=a,t.validateElement=u,t.hide=i,t.show=s,t.documentNotReadyOrSSRTesting=l,t.resetForTesting=c;var f=null},function(e,t,n){"use strict";function o(){return i}function r(e){return i[e]||(i[e]=0),i[e]+=1,e}function a(e){return i[e]&&(i[e]-=1),e}function u(){return Object.keys(i).reduce(function(e,t){return e+i[t]},0)}Object.defineProperty(t,"__esModule",{value:!0}),t.get=o,t.add=r,t.remove=a,t.totalCount=u;var i={}},function(e,t,n){"use strict";Object.defineProperty(t,"__esModule",{value:!0});var o=n(21),r=function(e){return e&&e.__esModule?e:{default:e}}(o),a=r.default,u=a.canUseDOM?window.HTMLElement:{};t.default=u,e.exports=t.default},function(e,t,n){"use strict";Object.defineProperty(t,"__esModule",{value:!0});var o=n(11),r=function(e){return e&&e.__esModule?e:{default:e}}(o);t.default=r.default,e.exports=t.default},function(e,t,n){"use strict";function o(e){return e&&e.__esModule?e:{default:e}}function r(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function a(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function u(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}function i(e){return e()}Object.defineProperty(t,"__esModule",{value:!0}),t.bodyOpenClassName=t.portalClassName=void 0;var s=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var o in n)Object.prototype.hasOwnProperty.call(n,o)&&(e[o]=n[o])}return e},l=function(){function e(e,t){for(var n=0;n<t.length;n++){var o=t[n];o.enumerable=o.enumerable||!1,o.configurable=!0,"value"in o&&(o.writable=!0),Object.defineProperty(e,o.key,o)}}return function(t,n,o){return n&&e(t.prototype,n),o&&e(t,o),t}}(),c=n(3),f=o(c),p=n(12),d=o(p),y=n(4),v=o(y),h=n(17),b=o(h),m=n(7),O=function(e){if(e&&e.__esModule)return e;var t={};if(null!=e)for(var n in e)Object.prototype.hasOwnProperty.call(e,n)&&(t[n]=e[n]);return t.default=e,t}(m),w=n(9),g=o(w),C=t.portalClassName="ReactModalPortal",T=t.bodyOpenClassName="ReactModal__Body--open",j=d.default.unstable_renderSubtreeIntoContainer,P=function(e){function t(){var e,n,o,u;r(this,t);for(var l=arguments.length,c=Array(l),p=0;p<l;p++)c[p]=arguments[p];return n=o=a(this,(e=t.__proto__||Object.getPrototypeOf(t)).call.apply(e,[this].concat(c))),o.removePortal=function(){d.default.unmountComponentAtNode(o.node),i(o.props.parentSelector).removeChild(o.node)},o.renderPortal=function(e){o.portal=j(o,f.default.createElement(b.default,s({defaultStyles:t.defaultStyles},e)),o.node)},u=n,a(o,u)}return u(t,e),l(t,[{key:"componentDidMount",value:function(){this.node=document.createElement("div"),this.node.className=this.props.portalClassName,i(this.props.parentSelector).appendChild(this.node),this.renderPortal(this.props)}},{key:"componentWillReceiveProps",value:function(e){var t=e.isOpen;if(this.props.isOpen||t){var n=i(this.props.parentSelector),o=i(e.parentSelector);o!==n&&(n.removeChild(this.node),o.appendChild(this.node)),this.renderPortal(e)}}},{key:"componentWillUpdate",value:function(e){e.portalClassName!==this.props.portalClassName&&(this.node.className=e.portalClassName)}},{key:"componentWillUnmount",value:function(){if(this.node&&this.portal){var e=this.portal.state,t=Date.now(),n=e.isOpen&&this.props.closeTimeoutMS&&(e.closesAt||t+this.props.closeTimeoutMS);n?(e.beforeClose||this.portal.closeWithTimeout(),setTimeout(this.removePortal,n-t)):this.removePortal()}}},{key:"render",value:function(){return null}}],[{key:"setAppElement",value:function(e){O.setElement(e)}},{key:"injectCSS",value:function(){console.warn("React-Modal: injectCSS has been deprecated and no longer has any effect. It will be removed in a later version")}}]),t}(c.Component);P.propTypes={isOpen:v.default.bool.isRequired,style:v.default.shape({content:v.default.object,overlay:v.default.object}),portalClassName:v.default.string,bodyOpenClassName:v.default.string,className:v.default.oneOfType([v.default.string,v.default.object]),overlayClassName:v.default.oneOfType([v.default.string,v.default.object]),appElement:v.default.instanceOf(g.default),onAfterOpen:v.default.func,onRequestClose:v.default.func,closeTimeoutMS:v.default.number,ariaHideApp:v.default.bool,shouldFocusAfter:v.default.bool,shouldCloseOnOverlayClick:v.default.bool,parentSelector:v.default.func,aria:v.default.object,role:v.default.string,contentLabel:v.default.string},P.defaultProps={isOpen:!1,portalClassName:C,bodyOpenClassName:T,ariaHideApp:!0,closeTimeoutMS:0,shouldFocusAfterRender:!0,shouldCloseOnOverlayClick:!0,parentSelector:function(){return document.body}},P.defaultStyles={overlay:{position:"fixed",top:0,left:0,right:0,bottom:0,backgroundColor:"rgba(255, 255, 255, 0.75)"},content:{position:"absolute",top:"40px",left:"40px",right:"40px",bottom:"40px",border:"1px solid #ccc",background:"#fff",overflow:"auto",WebkitOverflowScrolling:"touch",borderRadius:"4px",outline:"none",padding:"20px"}},t.default=P},function(e,n){e.exports=t},function(e,t,n){"use strict";var o=n(0),r=n(1),a=n(5),u=n(14),i=n(2),s=n(15);e.exports=function(e,t){function n(e){var t=e&&(_&&e[_]||e[E]);if("function"==typeof t)return t}function l(e,t){return e===t?0!==e||1/e==1/t:e!==e&&t!==t}function c(e){this.message=e,this.stack=""}function f(e){function n(n,s,l,f,p,d,y){if(f=f||S,d=d||l,y!==i)if(t)r(!1,"Calling PropTypes validators directly is not supported by the `prop-types` package. 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   All rights reserved.
diff --git a/package.json b/package.json
index 082d6dba..fd9eb1d9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-modal",
-  "version": "2.3.3",
+  "version": "3.0.0-alpha",
   "description": "Accessible modal dialog component for React.JS",
   "main": "./lib/index.js",
   "repository": {