diff --git a/dist/tocbot.js b/dist/tocbot.js
index 2b537b86..677e9feb 100644
--- a/dist/tocbot.js
+++ b/dist/tocbot.js
@@ -150,7 +150,7 @@ module.exports = function (options) {
         posFixedEl.className += SPACE_CHAR + options.positionFixedClass
       }
     } else {
-      posFixedEl.className = posFixedEl.className.split(SPACE_CHAR + options.positionFixedClass).join('')
+      posFixedEl.className = posFixedEl.className.replace(SPACE_CHAR + options.positionFixedClass, '')
     }
   }
 
@@ -168,6 +168,19 @@ module.exports = function (options) {
     return position
   }
 
+  /**
+   * Update className only when changed.
+   * @param {HTMLElement} obj
+   * @param {string} className
+   * @return {HTMLElement} obj
+   */
+  function updateClassname (obj, className) {
+    if (obj && obj.className !== className) {
+      obj.className = className
+    }
+    return obj
+  }
+
   /**
    * Update TOC highlighting and collapsed groupings.
    */
@@ -220,12 +233,12 @@ module.exports = function (options) {
       var tocLinks = tocElement
         .querySelectorAll('.' + options.linkClass)
       forEach.call(tocLinks, function (tocLink) {
-        tocLink.className = tocLink.className.split(SPACE_CHAR + options.activeLinkClass).join('')
+        updateClassname(tocLink, tocLink.className.replace(SPACE_CHAR + options.activeLinkClass, ''))
       })
       var tocLis = tocElement
         .querySelectorAll('.' + options.listItemClass)
       forEach.call(tocLis, function (tocLi) {
-        tocLi.className = tocLi.className.split(SPACE_CHAR + options.activeListItemClass).join('')
+        updateClassname(tocLi, tocLi.className.replace(SPACE_CHAR + options.activeListItemClass, ''))
       })
 
       // Add the active class to the active tocLink.
@@ -249,7 +262,7 @@ module.exports = function (options) {
 
       // Expand the active link's collapsible list and its sibling if applicable.
       if (activeTocLink && activeTocLink.nextSibling && activeTocLink.nextSibling.className.indexOf(options.isCollapsedClass) !== -1) {
-        activeTocLink.nextSibling.className = activeTocLink.nextSibling.className.split(SPACE_CHAR + options.isCollapsedClass).join('')
+        updateClassname(activeTocLink.nextSibling, activeTocLink.nextSibling.className.replace(SPACE_CHAR + options.isCollapsedClass, ''))
       }
       removeCollapsedFromParents(activeTocLink && activeTocLink.parentNode.parentNode)
     }
@@ -262,7 +275,7 @@ module.exports = function (options) {
    */
   function removeCollapsedFromParents (element) {
     if (element && element.className.indexOf(options.collapsibleClass) !== -1 && element.className.indexOf(options.isCollapsedClass) !== -1) {
-      element.className = element.className.split(SPACE_CHAR + options.isCollapsedClass).join('')
+      updateClassname(element, element.className.replace(SPACE_CHAR + options.isCollapsedClass, ''))
       return removeCollapsedFromParents(element.parentNode.parentNode)
     }
     return element
diff --git a/dist/tocbot.min.js b/dist/tocbot.min.js
index 34d30430..204ac058 100644
--- a/dist/tocbot.min.js
+++ b/dist/tocbot.min.js
@@ -1 +1 @@
-(()=>{var e={163:e=>{e.exports=function(e){var t,n=[].forEach,l=[].some,o=document.body,r=!0,i=" ";function s(t,l){var o,r,c,d=l.appendChild((o=t,r=document.createElement("li"),c=document.createElement("a"),e.listItemClass&&r.setAttribute("class",e.listItemClass),e.onClick&&(c.onclick=e.onClick),e.includeTitleTags&&c.setAttribute("title",o.textContent),e.includeHtml&&o.childNodes.length?n.call(o.childNodes,(function(e){c.appendChild(e.cloneNode(!0))})):c.textContent=o.textContent,c.setAttribute("href",e.basePath+"#"+o.id),c.setAttribute("class",e.linkClass+i+"node-name--"+o.nodeName+i+e.extraLinkClasses),r.appendChild(c),r));if(t.children.length){var u=a(t.isCollapsed);t.children.forEach((function(e){s(e,u)})),d.appendChild(u)}}function a(t){var n=e.orderedList?"ol":"ul",l=document.createElement(n),o=e.listClass+i+e.extraListClasses;return t&&(o=(o=o+i+e.collapsibleClass)+i+e.isCollapsedClass),l.setAttribute("class",o),l}function c(t){var n=0;return null!==t&&(n=t.offsetTop,e.hasInnerContainers&&(n+=c(t.offsetParent))),n}function d(t){return t&&-1!==t.className.indexOf(e.collapsibleClass)&&-1!==t.className.indexOf(e.isCollapsedClass)?(t.className=t.className.split(i+e.isCollapsedClass).join(""),d(t.parentNode.parentNode)):t}return{enableTocAnimation:function(){r=!0},disableTocAnimation:function(t){var n=t.target||t.srcElement;"string"==typeof n.className&&-1!==n.className.indexOf(e.linkClass)&&(r=!1)},render:function(e,n){var l=a(!1);if(n.forEach((function(e){s(e,l)})),null!==(t=e||t))return t.firstChild&&t.removeChild(t.firstChild),0===n.length?t:t.appendChild(l)},updateToc:function(s){var a;a=e.scrollContainer&&document.querySelector(e.scrollContainer)?document.querySelector(e.scrollContainer).scrollTop:document.documentElement.scrollTop||o.scrollTop,e.positionFixedSelector&&function(){var n;n=e.scrollContainer&&document.querySelector(e.scrollContainer)?document.querySelector(e.scrollContainer).scrollTop:document.documentElement.scrollTop||o.scrollTop;var l=document.querySelector(e.positionFixedSelector);"auto"===e.fixedSidebarOffset&&(e.fixedSidebarOffset=t.offsetTop),n>e.fixedSidebarOffset?-1===l.className.indexOf(e.positionFixedClass)&&(l.className+=i+e.positionFixedClass):l.className=l.className.split(i+e.positionFixedClass).join("")}();var u,f=s;if(r&&null!==t&&f.length>0){l.call(f,(function(t,n){return c(t)>a+e.headingsOffset+10?(u=f[0===n?n:n-1],!0):n===f.length-1?(u=f[f.length-1],!0):void 0}));var m=t.querySelector("."+e.activeLinkClass),h=t.querySelector("."+e.linkClass+".node-name--"+u.nodeName+'[href="'+e.basePath+"#"+u.id.replace(/([ #;&,.+*~':"!^$[\]()=>|/\\@])/g,"\\$1")+'"]');if(m===h)return;var p=t.querySelectorAll("."+e.linkClass);n.call(p,(function(t){t.className=t.className.split(i+e.activeLinkClass).join("")}));var C=t.querySelectorAll("."+e.listItemClass);n.call(C,(function(t){t.className=t.className.split(i+e.activeListItemClass).join("")})),h&&-1===h.className.indexOf(e.activeLinkClass)&&(h.className+=i+e.activeLinkClass);var g=h&&h.parentNode;g&&-1===g.className.indexOf(e.activeListItemClass)&&(g.className+=i+e.activeListItemClass);var v=t.querySelectorAll("."+e.listClass+"."+e.collapsibleClass);n.call(v,(function(t){-1===t.className.indexOf(e.isCollapsedClass)&&(t.className+=i+e.isCollapsedClass)})),h&&h.nextSibling&&-1!==h.nextSibling.className.indexOf(e.isCollapsedClass)&&(h.nextSibling.className=h.nextSibling.className.split(i+e.isCollapsedClass).join("")),d(h&&h.parentNode.parentNode)}}}}},547:e=>{e.exports={tocSelector:".js-toc",contentSelector:".js-toc-content",headingSelector:"h1, h2, h3",ignoreSelector:".js-toc-ignore",hasInnerContainers:!1,linkClass:"toc-link",extraLinkClasses:"",activeLinkClass:"is-active-link",listClass:"toc-list",extraListClasses:"",isCollapsedClass:"is-collapsed",collapsibleClass:"is-collapsible",listItemClass:"toc-list-item",activeListItemClass:"is-active-li",collapseDepth:0,scrollSmooth:!0,scrollSmoothDuration:420,scrollSmoothOffset:0,scrollEndCallback:function(e){},headingsOffset:1,throttleTimeout:50,positionFixedSelector:null,positionFixedClass:"is-position-fixed",fixedSidebarOffset:"auto",includeHtml:!1,includeTitleTags:!1,onClick:function(e){},orderedList:!0,scrollContainer:null,skipRendering:!1,headingLabelCallback:!1,ignoreHiddenElements:!1,headingObjectCallback:null,basePath:"",disableTocScrollSync:!1,tocScrollOffset:0}},971:(e,t,n)=>{var l,o,r;o=[],void 0===(r="function"==typeof(l=function(e){"use strict";var t,l,o,r=n(547),i={},s={},a=n(163),c=n(279),d=n(938),u=!!(e&&e.document&&e.document.querySelector&&e.addEventListener);if("undefined"!=typeof window||u){var f=Object.prototype.hasOwnProperty;return s.destroy=function(){var e=h(i);null!==e&&(i.skipRendering||e&&(e.innerHTML=""),i.scrollContainer&&document.querySelector(i.scrollContainer)?(document.querySelector(i.scrollContainer).removeEventListener("scroll",this._scrollListener,!1),document.querySelector(i.scrollContainer).removeEventListener("resize",this._scrollListener,!1),t&&document.querySelector(i.scrollContainer).removeEventListener("click",this._clickListener,!1)):(document.removeEventListener("scroll",this._scrollListener,!1),document.removeEventListener("resize",this._scrollListener,!1),t&&document.removeEventListener("click",this._clickListener,!1)))},s.init=function(e){if(u){i=function(){for(var e={},t=0;t<arguments.length;t++){var n=arguments[t];for(var l in n)f.call(n,l)&&(e[l]=n[l])}return 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n=e&&e.target&&e.target.scrollingElement&&0===e.target.scrollingElement.scrollTop;(e&&(0===e.eventPhase||null===e.currentTarget)||n)&&(t.updateToc(o),i.scrollEndCallback&&i.scrollEndCallback(e))}),i.throttleTimeout),this._scrollListener(),i.scrollContainer&&document.querySelector(i.scrollContainer)?(document.querySelector(i.scrollContainer).addEventListener("scroll",this._scrollListener,!1),document.querySelector(i.scrollContainer).addEventListener("resize",this._scrollListener,!1)):(document.addEventListener("scroll",this._scrollListener,!1),document.addEventListener("resize",this._scrollListener,!1));var v=null;return this._clickListener=m((function(e){i.scrollSmooth&&t.disableTocAnimation(e),t.updateToc(o),v&&clearTimeout(v),v=setTimeout((function(){t.enableTocAnimation()}),i.scrollSmoothDuration)}),i.throttleTimeout),i.scrollContainer&&document.querySelector(i.scrollContainer)?document.querySelector(i.scrollContainer).addEventListener("click",this._clickListener,!1):document.addEventListener("click",this._clickListener,!1),this}}}},s.refresh=function(e){s.destroy(),s.init(e||this.options)},e.tocbot=s,s}function m(e,t,n){var l,o;return t||(t=250),function(){var r=n||this,i=+new Date,s=arguments;l&&i<l+t?(clearTimeout(o),o=setTimeout((function(){l=i,e.apply(r,s)}),t)):(l=i,e.apply(r,s))}}function h(e){try{return e.tocElement||document.querySelector(e.tocSelector)}catch(t){return console.warn("TOC element not found: "+e.tocSelector),null}}}(void 0!==n.g?n.g:window||n.g))?l.apply(t,o):l)||(e.exports=r)},279:e=>{e.exports=function(e){var t=[].reduce;function n(e){return e[e.length-1]}function 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l=n;e.ignoreSelector&&(l=n.split(",").map((function(t){return t.trim()+":not("+e.ignoreSelector+")"})));try{return t.querySelectorAll(l)}catch(e){return console.warn("Headers not found with selector: "+l),null}}}}},374:(e,t)=>{t.initSmoothScrolling=function(e){var t=e.duration,n=e.offset,l=location.hash?o(location.href):location.href;function o(e){return e.slice(0,e.lastIndexOf("#"))}document.body.addEventListener("click",(function(r){var i;"a"!==(i=r.target).tagName.toLowerCase()||!(i.hash.length>0||"#"===i.href.charAt(i.href.length-1))||o(i.href)!==l&&o(i.href)+"#"!==l||r.target.className.indexOf("no-smooth-scroll")>-1||"#"===r.target.href.charAt(r.target.href.length-2)&&"!"===r.target.href.charAt(r.target.href.length-1)||-1===r.target.className.indexOf(e.linkClass)||function(e,t){var n,l,o=window.pageYOffset,r={duration:t.duration,offset:t.offset||0,callback:t.callback,easing:t.easing||function(e,t,n,l){return(e/=l/2)<1?n/2*e*e+t:-n/2*(--e*(e-2)-1)+t}},i=document.querySelector('[id="'+decodeURI(e).split("#").join("")+'"]')||document.querySelector('[id="'+e.split("#").join("")+'"]'),s="string"==typeof e?r.offset+(e?i&&i.getBoundingClientRect().top||0:-(document.documentElement.scrollTop||document.body.scrollTop)):e,a="function"==typeof r.duration?r.duration(s):r.duration;function c(e){l=e-n,window.scrollTo(0,r.easing(l,o,s,a)),l<a?requestAnimationFrame(c):(window.scrollTo(0,o+s),"function"==typeof r.callback&&r.callback())}requestAnimationFrame((function(e){n=e,c(e)}))}(r.target.hash,{duration:t,offset:n,callback:function(){var e,t;e=r.target.hash,(t=document.getElementById(e.substring(1)))&&(/^(?:a|select|input|button|textarea)$/i.test(t.tagName)||(t.tabIndex=-1),t.focus())}})}),!1)}},938:e=>{e.exports=function(e){var t=e.tocElement||document.querySelector(e.tocSelector);if(t&&t.scrollHeight>t.clientHeight){var n=t.querySelector("."+e.activeListItemClass);n&&(t.scrollTop=n.offsetTop-e.tocScrollOffset)}}}},t={};function n(l){var o=t[l];if(void 0!==o)return o.exports;var r=t[l]={exports:{}};return e[l](r,r.exports,n),r.exports}n.g=function(){if("object"==typeof globalThis)return globalThis;try{return this||new Function("return this")()}catch(e){if("object"==typeof window)return window}}(),n(971)})();
\ No newline at end of file
+(()=>{var e={163:e=>{e.exports=function(e){var t,n=[].forEach,l=[].some,o=document.body,r=!0,i=" ";function s(t,l){var o,r,a,d=l.appendChild((o=t,r=document.createElement("li"),a=document.createElement("a"),e.listItemClass&&r.setAttribute("class",e.listItemClass),e.onClick&&(a.onclick=e.onClick),e.includeTitleTags&&a.setAttribute("title",o.textContent),e.includeHtml&&o.childNodes.length?n.call(o.childNodes,(function(e){a.appendChild(e.cloneNode(!0))})):a.textContent=o.textContent,a.setAttribute("href",e.basePath+"#"+o.id),a.setAttribute("class",e.linkClass+i+"node-name--"+o.nodeName+i+e.extraLinkClasses),r.appendChild(a),r));if(t.children.length){var u=c(t.isCollapsed);t.children.forEach((function(e){s(e,u)})),d.appendChild(u)}}function c(t){var n=e.orderedList?"ol":"ul",l=document.createElement(n),o=e.listClass+i+e.extraListClasses;return t&&(o=(o=o+i+e.collapsibleClass)+i+e.isCollapsedClass),l.setAttribute("class",o),l}function a(t){var n=0;return 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