diff --git a/build/squire-raw.js b/build/squire-raw.js
index 2878bf2..d50bb0e 100644
--- a/build/squire-raw.js
+++ b/build/squire-raw.js
@@ -47,6 +47,7 @@ var cantFocusEmptyTextNodes = isIElt11 || isWebKit;
 var losesSelectionOnBlur = isIElt11;
 
 var canObserveMutations = typeof MutationObserver !== 'undefined';
+var canWeakMap = typeof WeakMap !== 'undefined';
 
 // Use [^ \t\r\n] instead of \S so that nbsp does not count as white-space
 var notWS = /[^ \t\r\n]/;
@@ -201,25 +202,48 @@ function every ( nodeList, fn ) {
 
 // ---
 
+var UNKNOWN = 0;
+var INLINE = 1;
+var BLOCK = 2;
+var CONTAINER = 3;
+
+var nodeCategoryCache = canWeakMap ? new WeakMap() : null;
+
 function isLeaf ( node ) {
-    return node.nodeType === ELEMENT_NODE &&
-        !!leafNodeNames[ node.nodeName ];
+    return node.nodeType === ELEMENT_NODE && !!leafNodeNames[ node.nodeName ];
 }
-function isInline ( node ) {
-    return inlineNodeNames.test( node.nodeName ) &&
+function getNodeCategory ( node ) {
+    if ( canWeakMap && nodeCategoryCache.has( node ) ) {
+        return nodeCategoryCache.get( node );
+    }
+    var type = node.nodeType;
+    var nodeCategory;
+    if ( type === TEXT_NODE ) {
+        nodeCategory = INLINE;
+    } else if ( type !== ELEMENT_NODE && type !== DOCUMENT_FRAGMENT_NODE ) {
+        nodeCategory = UNKNOWN;
+    } else if ( !every( node.childNodes, isInline ) ) {
         // Malformed HTML can have block tags inside inline tags. Need to treat
         // these as containers rather than inline. See #239.
-        ( node.nodeType === TEXT_NODE || every( node.childNodes, isInline ) );
+        nodeCategory = CONTAINER;
+    } else if ( inlineNodeNames.test( node.nodeName ) ) {
+        nodeCategory = INLINE;
+    } else {
+        nodeCategory = BLOCK;
+    }
+    if ( canWeakMap ) {
+        nodeCategoryCache.set( node, nodeCategory );
+    }
+    return nodeCategory;
+}
+function isInline ( node ) {
+    return getNodeCategory( node ) === INLINE;
 }
 function isBlock ( node ) {
-    var type = node.nodeType;
-    return ( type === ELEMENT_NODE || type === DOCUMENT_FRAGMENT_NODE ) &&
-        !isInline( node ) && every( node.childNodes, isInline );
+    return getNodeCategory( node ) === BLOCK;
 }
 function isContainer ( node ) {
-    var type = node.nodeType;
-    return ( type === ELEMENT_NODE || type === DOCUMENT_FRAGMENT_NODE ) &&
-        !isInline( node ) && !isBlock( node );
+    return getNodeCategory( node ) === CONTAINER;
 }
 
 function getBlockWalker ( node, root ) {
@@ -3110,6 +3134,9 @@ proto._keyUpDetectChange = function ( event ) {
 };
 
 proto._docWasChanged = function () {
+    if ( canWeakMap ) {
+        nodeCategoryCache = new WeakMap();
+    }
     if ( this._ignoreAllChanges ) {
         return;
     }
diff --git a/build/squire.js b/build/squire.js
index a8facde..6923514 100644
--- a/build/squire.js
+++ b/build/squire.js
@@ -1,2 +1,2 @@
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n,o,i,a,d=e.childNodes,l=e.ownerDocument,c=null,h=L(l)._config;for(n=0,o=d.length;o>n;n+=1)i=d[n],a="BR"===i.nodeName,!a&&r(i)?(c||(c=_(l,h.blockTag,h.blockAttributes)),c.appendChild(i),n-=1,o-=1):(a||c)&&(c||(c=_(l,h.blockTag,h.blockAttributes)),S(c,t),a?e.replaceChild(c,i):(e.insertBefore(c,i),n+=1,o+=1),c=null),s(i)&&y(i,t);return c&&e.appendChild(S(c,t)),e}function T(e,t,n,o){var i,r,a,s=e.nodeType;if(s===F&&e!==n)return T(e.parentNode,e.splitText(t),n,o);if(s===w){if("number"==typeof t&&(t=t<e.childNodes.length?e.childNodes[t]:null),e===n)return t;for(i=e.parentNode,r=e.cloneNode(!1);t;)a=t.nextSibling,r.appendChild(t),t=a;return"OL"===e.nodeName&&f(e,o,"BLOCKQUOTE")&&(r.start=(+e.start||1)+e.childNodes.length-1),S(e,o),S(r,o),(a=e.nextSibling)?i.insertBefore(r,a):i.appendChild(r),T(i,r,n,o)}return t}function b(e,t){for(var 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+},fn.undo=function(){if(0!==this._undoIndex||!this._isInUndoState){this._recordUndoState(this.getSelection()),this._undoIndex-=1,this._setHTML(this._undoStack[this._undoIndex]);var e=this._getRangeAndRemoveBookmark();e&&this.setSelection(e),this._isInUndoState=!0,this.fireEvent("undoStateChange",{canUndo:0!==this._undoIndex,canRedo:!0}),this.fireEvent("input")}return this},fn.redo=function(){var e=this._undoIndex,t=this._undoStackLength;if(t>e+1&&this._isInUndoState){this._undoIndex+=1,this._setHTML(this._undoStack[this._undoIndex]);var n=this._getRangeAndRemoveBookmark();n&&this.setSelection(n),this.fireEvent("undoStateChange",{canUndo:!0,canRedo:t>e+2}),this.fireEvent("input")}return this},fn.hasFormat=function(e,t,o){if(e=e.toUpperCase(),t||(t={}),!o&&!(o=this.getSelection()))return!1;!o.collapsed&&o.startContainer.nodeType===M&&o.startOffset===o.startContainer.length&&o.startContainer.nextSibling&&o.setStartBefore(o.startContainer.nextSibling),!o.collapsed&&o.endContainer.nodeType===M&&0===o.endOffset&&o.endContainer.previousSibling&&o.setEndAfter(o.endContainer.previousSibling);var r,i,a=this._root,s=o.commonAncestorContainer;if(p(s,a,e,t))return!0;if(s.nodeType===M)return!1;r=new n(s,q,function(e){return Rt(o,e,!0)},!1);for(var d=!1;i=r.nextNode();){if(!p(i,a,e,t))return!1;d=!0}return d},fn.getFontInfo=function(e){var n,o,r,i={color:t,backgroundColor:t,family:t,size:t},a=0;if(!e&&!(e=this.getSelection()))return i;if(n=e.commonAncestorContainer,e.collapsed||n.nodeType===M)for(n.nodeType===M&&(n=n.parentNode);4>a&&n;)(o=n.style)&&(!i.color&&(r=o.color)&&(i.color=r,a+=1),!i.backgroundColor&&(r=o.backgroundColor)&&(i.backgroundColor=r,a+=1),!i.family&&(r=o.fontFamily)&&(i.family=r,a+=1),!i.size&&(r=o.fontSize)&&(i.size=r,a+=1)),n=n.parentNode;return i},fn._addFormat=function(e,t,o){var r,i,s,d,l,c,h,u,f,g=this._root;if(o.collapsed){for(r=y(this.createElement(e,t),g),xt(o,r),o.setStart(r.firstChild,r.firstChild.length),o.collapse(!0),f=r;a(f);)f=f.parentNode;mn(f,r)}else{if(i=new n(o.commonAncestorContainer,q|z,function(e){return(e.nodeType===M||"BR"===e.nodeName||"IMG"===e.nodeName)&&Rt(o,e,!0)},!1),s=o.startContainer,l=o.startOffset,d=o.endContainer,c=o.endOffset,i.currentNode=s,i.filter(s)||(s=i.nextNode(),l=0),!s)return o;do h=i.currentNode,u=!p(h,g,e,t),u&&(h===d&&h.length>c&&h.splitText(c),h===s&&l&&(h=h.splitText(l),d===s&&(d=h,c-=l),s=h,l=0),r=this.createElement(e,t),N(h,r),r.appendChild(h));while(i.nextNode());d.nodeType!==M&&(h.nodeType===M?(d=h,c=h.length):(d=h.parentNode,c=1)),o=this._createRange(s,l,d,c)}return o},fn._removeFormat=function(e,t,n,o){this._saveRangeToBookmark(n);var r,i=this._doc;n.collapsed&&(ut?(r=i.createTextNode(X),this._didAddZWS()):r=i.createTextNode(""),xt(n,r));for(var s=n.commonAncestorContainer;a(s);)s=s.parentNode;var d=n.startContainer,l=n.startOffset,c=n.endContainer,h=n.endOffset,u=[],p=function(e,t){if(!Rt(n,e,!1)){var o,r,i=e.nodeType===M;if(!Rt(n,e,!0))return void("INPUT"===e.nodeName||i&&!e.data||u.push([t,e]));if(i)e===c&&h!==e.length&&u.push([t,e.splitText(h)]),e===d&&l&&(e.splitText(l),u.push([t,e]));else for(o=e.firstChild;o;o=r)r=o.nextSibling,p(o,t)}},g=Array.prototype.filter.call(s.getElementsByTagName(e),function(o){return Rt(n,o,!0)&&f(o,e,t)});return o||g.forEach(function(e){p(e,e)}),u.forEach(function(e){var t=e[0].cloneNode(!1),n=e[1];N(n,t),t.appendChild(n)}),g.forEach(function(e){N(e,_(e))}),this._getRangeAndRemoveBookmark(n),r&&n.collapse(!1),k(s,n),n},fn.changeFormat=function(e,t,n,o){return n||(n=this.getSelection())?(this.saveUndoState(n),t&&(n=this._removeFormat(t.tag.toUpperCase(),t.attributes||{},n,o)),e&&(n=this._addFormat(e.tag.toUpperCase(),e.attributes||{},n)),this.setSelection(n),this._updatePath(n,!0),pt||this._docWasChanged(),this):this};var Nn={DT:"DD",DD:"DT",LI:"LI"},_n=function(e,t,n,o){var r=Nn[t.nodeName],i=null,a=b(n,o,t.parentNode,e._root),s=e._config;return r||(r=s.blockTag,i=s.blockAttributes),f(a,r,i)||(t=S(a.ownerDocument,r,i),a.dir&&(t.dir=a.dir),N(a,t),t.appendChild(_(a)),a=t),a};fn.forEachBlock=function(e,t,n){if(!n&&!(n=this.getSelection()))return this;t&&this.saveUndoState(n);var o=this._root,r=Pt(n,o),i=It(n,o);if(r&&i)do if(e(r)||r===i)break;while(r=h(r,o));return t&&(this.setSelection(n),this._updatePath(n,!0),pt||this._docWasChanged()),this},fn.modifyBlocks=function(e,t){if(!t&&!(t=this.getSelection()))return this;this._isInUndoState?this._saveRangeToBookmark(t):this._recordUndoState(t);var n,o=this._root;return Ht(t,o),Ut(t,o),n=Lt(t,o,o),xt(t,e.call(this,n)),t.endOffset<t.endContainer.childNodes.length&&x(t.endContainer.childNodes[t.endOffset],o),x(t.startContainer.childNodes[t.startOffset],o),this._getRangeAndRemoveBookmark(t),this.setSelection(t),this._updatePath(t,!0),pt||this._docWasChanged(),this};var Sn=function(e){return this.createElement("BLOCKQUOTE",this._config.tagAttributes.blockquote,[e])},yn=function(e){var t=this._root,n=e.querySelectorAll("blockquote");return Array.prototype.filter.call(n,function(e){return!p(e.parentNode,t,"BLOCKQUOTE")}).forEach(function(e){N(e,_(e))}),e},Tn=function(){return this.createDefaultBlock([this.createElement("INPUT",{id:vn,type:"hidden"}),this.createElement("INPUT",{id:Cn,type:"hidden"})])},bn=function(e,t,n){for(var o,r,i,a,s=l(t,e._root),d=e._config.tagAttributes,c=d[n.toLowerCase()],h=d.li;o=s.nextNode();)"LI"===o.parentNode.nodeName&&(o=o.parentNode,s.currentNode=o.lastChild),"LI"!==o.nodeName?(a=e.createElement("LI",h),o.dir&&(a.dir=o.dir),(i=o.previousSibling)&&i.nodeName===n?(i.appendChild(a),C(o)):N(o,e.createElement(n,c,[a])),a.appendChild(_(o)),s.currentNode=a):(o=o.parentNode,r=o.nodeName,r!==n&&/^[OU]L$/.test(r)&&N(o,e.createElement(n,c,[_(o)])))},En=function(e){return bn(this,e,"UL"),e},kn=function(e){return bn(this,e,"OL"),e},Bn=function(e){var t,n,o,r,i,a=e.querySelectorAll("UL, OL"),d=e.querySelectorAll("LI"),l=this._root;for(t=0,n=a.length;n>t;t+=1)o=a[t],r=_(o),T(r,l),N(o,r);for(t=0,n=d.length;n>t;t+=1)i=d[t],s(i)?N(i,this.createDefaultBlock([_(i)])):(T(i,l),N(i,_(i)));return e},xn=function(e){var t,n,o,r,i,a,s=e.querySelectorAll("LI"),l=this._config.tagAttributes;for(t=0,n=s.length;n>t;t+=1)o=s[t],d(o.firstChild)||(r=o.parentNode.nodeName,i=o.previousSibling,i&&(i=i.lastChild)&&i.nodeName===r||(a=l[r.toLowerCase()],i=this.createElement(r,a),N(o,i)),i.appendChild(o));return e},Ln=function(e){var t=this._root,n=e.querySelectorAll("LI");return Array.prototype.filter.call(n,function(e){return!d(e.firstChild)}).forEach(function(n){var o,r=n.parentNode,i=r.parentNode,a=n.firstChild,s=a;if(n.previousSibling&&(r=b(r,n,i,t)),/^[OU]L$/.test(i.nodeName))i.insertBefore(n,r),r.firstChild||i.removeChild(r);else for(;s&&(o=s.nextSibling,!d(s));)i.insertBefore(s,r),s=o;for("LI"===i.nodeName&&a.previousSibling&&b(i,a,i.parentNode,t);n!==e&&!n.childNodes.length;)r=n.parentNode,r.removeChild(n),n=r},this),T(e,t),e};fn._ensureBottomLine=function(){var e=this._root,t=e.lastElementChild;t&&t.nodeName===this._config.blockTag&&s(t)||e.appendChild(this.createDefaultBlock())},fn.setKeyHandler=function(e,t){return this._keyHandlers[e]=t,this},fn._getHTML=function(){return this._root.innerHTML},fn._setHTML=function(e){var t=this._root,n=t;n.innerHTML=e;do y(n,t);while(n=h(n,t));this._ignoreChange=!0},fn.getHTML=function(e){var t,n,o,r,i,a,s=[];if(e&&(a=this.getSelection())&&this._saveRangeToBookmark(a),ht)for(t=this._root,n=t;n=h(n,t);)n.textContent||n.querySelector("BR")||(o=this.createElement("BR"),n.appendChild(o),s.push(o));if(r=this._getHTML().replace(/\u200B/g,""),ht)for(i=s.length;i--;)C(s[i]);return a&&this._getRangeAndRemoveBookmark(a),r},fn.setHTML=function(e){var t,n=this._doc.createDocumentFragment(),o=this.createElement("DIV"),r=this._root;o.innerHTML=e,n.appendChild(_(o)),tn(n),an(n,r),T(n,r);for(var i=n;i=h(i,r);)y(i,r);for(this._ignoreChange=!0;t=r.lastChild;)r.removeChild(t);r.appendChild(n),y(r,r),this._undoIndex=-1,this._undoStack.length=0,this._undoStackLength=0,this._isInUndoState=!1;var a=this._getRangeAndRemoveBookmark()||this._createRange(r.firstChild,0);return this.saveUndoState(a),this._lastSelection=a,D.call(this),this._updatePath(a,!0),this},fn.insertElement=function(e,t){if(t||(t=this.getSelection()),t.collapse(!0),a(e))xt(t,e),t.setStartAfter(e);else{for(var n,o,r=this._root,i=Pt(t,r)||r;i!==r&&!i.nextSibling;)i=i.parentNode;i!==r&&(n=i.parentNode,o=b(n,i.nextSibling,r,r)),o?r.insertBefore(e,o):(r.appendChild(e),o=this.createDefaultBlock(),r.appendChild(o)),t.setStart(o,0),t.setEnd(o,0),Dt(t)}return this.focus(),this.setSelection(t),this._updatePath(t),pt||this._docWasChanged(),this},fn.insertImage=function(e,t){var n=this.createElement("IMG",O({src:e},t,!0));return this.insertElement(n),n};var An=/\b((?:(?:ht|f)tps?:\/\/|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,}\/)(?:[^\s()<>]+|\([^\s()<>]+\))+(?:\((?:[^\s()<>]+|(?:\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'".,<>?«»“”‘’]))|([\w\-.%+]+@(?:[\w\-]+\.)+[A-Z]{2,}\b)/i,On=function(e,t,o){for(var r,i,a,s,d,l,c,h=e.ownerDocument,u=new n(e,q,function(e){return!p(e,t,"A")},!1),f=o._config.tagAttributes.a;r=u.nextNode();)for(i=r.data,a=r.parentNode;s=An.exec(i);)d=s.index,l=d+s[0].length,d&&(c=h.createTextNode(i.slice(0,d)),a.insertBefore(c,r)),c=o.createElement("A",O({href:s[1]?/^(?:ht|f)tps?:/.test(s[1])?s[1]:"http://"+s[1]:"mailto:"+s[2]},f,!1)),c.textContent=i.slice(d,l),a.insertBefore(c,r),r.data=i=i.slice(l)};fn.insertHTML=function(e,t){var n,o,r,i,a,s,d,l=this.getSelection(),c=this._doc;"undefined"!=typeof DOMPurify&&DOMPurify.isSupported?(i=DOMPurify.sanitize(e,{WHOLE_DOCUMENT:!1,RETURN_DOM:!0,RETURN_DOM_FRAGMENT:!0}),i=c.importNode(i,!0)):(t&&(n=e.indexOf("<!--StartFragment-->"),o=e.lastIndexOf("<!--EndFragment-->"),n>-1&&o>-1&&(e=e.slice(n+20,o))),r=this.createElement("DIV"),r.innerHTML=e,i=c.createDocumentFragment(),i.appendChild(_(r))),this.saveUndoState(l);try{for(a=this._root,s=i,d={fragment:i,preventDefault:function(){this.defaultPrevented=!0},defaultPrevented:!1},On(i,i,this),tn(i),an(i,null),nn(i),i.normalize();s=h(s,i);)y(s,null);t&&this.fireEvent("willPaste",d),d.defaultPrevented||(Ot(l,d.fragment,a),pt||this._docWasChanged(),l.collapse(!1),this._ensureBottomLine()),this.setSelection(l),this._updatePath(l,!0),t&&this.focus()}catch(u){this.didError(u)}return this};var Rn=function(e){return e.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;").split('"').join("&quot;")};fn.insertPlainText=function(e,t){var n,o,r,i,a=e.split("\n"),s=this._config,d=s.blockTag,l=s.blockAttributes,c="</"+d+">",h="<"+d;for(n in l)h+=" "+n+'="'+Rn(l[n])+'"';for(h+=">",o=0,r=a.length;r>o;o+=1)i=a[o],i=Rn(i).replace(/ (?= )/g,"&nbsp;"),o&&r>o+1&&(i=h+(i||"<BR>")+c),a[o]=i;return this.insertHTML(a.join(""),t)};var Dn=function(e,t,n){return function(){return this[e](t,n),this.focus()}};fn.addStyles=function(e){if(e){var t=this._doc.documentElement.firstChild,n=this.createElement("STYLE",{type:"text/css"});n.appendChild(this._doc.createTextNode(e)),t.appendChild(n)}return this},fn.bold=Dn("changeFormat",{tag:"B"}),fn.italic=Dn("changeFormat",{tag:"I"}),fn.underline=Dn("changeFormat",{tag:"U"}),fn.strikethrough=Dn("changeFormat",{tag:"S"}),fn.subscript=Dn("changeFormat",{tag:"SUB"},{tag:"SUP"}),fn.superscript=Dn("changeFormat",{tag:"SUP"},{tag:"SUB"}),fn.removeBold=Dn("changeFormat",null,{tag:"B"}),fn.removeItalic=Dn("changeFormat",null,{tag:"I"}),fn.removeUnderline=Dn("changeFormat",null,{tag:"U"}),fn.removeStrikethrough=Dn("changeFormat",null,{tag:"S"}),fn.removeSubscript=Dn("changeFormat",null,{tag:"SUB"}),fn.removeSuperscript=Dn("changeFormat",null,{tag:"SUP"}),fn.makeLink=function(e,t){var n=this.getSelection();if(n.collapsed){var o=e.indexOf(":")+1;if(o)for(;"/"===e[o];)o+=1;xt(n,this._doc.createTextNode(e.slice(o)))}return t=O(O({href:e},t,!0),this._config.tagAttributes.a,!1),this.changeFormat({tag:"A",attributes:t},{tag:"A"},n),this.focus()},fn.removeLink=function(){return this.changeFormat(null,{tag:"A"},this.getSelection(),!0),this.focus()},fn.setFontFace=function(e){return this.changeFormat(e?{tag:"SPAN",attributes:{"class":"font",style:"font-family: "+e+", sans-serif;"}}:null,{tag:"SPAN",attributes:{"class":"font"}}),this.focus()},fn.setFontSize=function(e){return this.changeFormat(e?{tag:"SPAN",attributes:{"class":"size",style:"font-size: "+("number"==typeof e?e+"px":e)}}:null,{tag:"SPAN",attributes:{"class":"size"}}),this.focus()},fn.setTextColour=function(e){return this.changeFormat(e?{tag:"SPAN",attributes:{"class":"colour",style:"color:"+e}}:null,{tag:"SPAN",attributes:{"class":"colour"}}),this.focus()},fn.setHighlightColour=function(e){return this.changeFormat(e?{tag:"SPAN",attributes:{"class":"highlight",style:"background-color:"+e}}:e,{tag:"SPAN",attributes:{"class":"highlight"}}),this.focus()},fn.setTextAlignment=function(e){return this.forEachBlock(function(t){t.className=(t.className.split(/\s+/).filter(function(e){return!/align/.test(e)}).join(" ")+" align-"+e).trim(),t.style.textAlign=e},!0),this.focus()},fn.setTextDirection=function(e){return this.forEachBlock(function(t){t.dir=e},!0),this.focus()},fn.removeAllFormatting=function(e){if(!e&&!(e=this.getSelection())||e.collapsed)return this;for(var t=this._root,n=e.commonAncestorContainer;n&&!s(n);)n=n.parentNode;if(n||(Ht(e,t),n=t),n.nodeType===M)return this;this.saveUndoState(e),Ut(e,n);for(var o,r,i=n.ownerDocument,a=e.startContainer,d=e.startOffset,l=e.endContainer,c=e.endOffset,h=i.createDocumentFragment(),u=i.createDocumentFragment(),f=b(l,c,n,t),p=b(a,d,n,t);p!==f;)o=p.nextSibling,h.appendChild(p),p=o;return I(this,h,u),u.normalize(),p=u.firstChild,o=u.lastChild,r=n.childNodes,p?(n.insertBefore(u,f),d=vt.call(r,p),c=vt.call(r,o)+1):(d=vt.call(r,f),c=d),e.setStart(n,d),e.setEnd(n,c),k(n,e),Dt(e),this.setSelection(e),this._updatePath(e,!0),this.focus()},fn.increaseQuoteLevel=Dn("modifyBlocks",Sn),fn.decreaseQuoteLevel=Dn("modifyBlocks",yn),fn.makeUnorderedList=Dn("modifyBlocks",En),fn.makeOrderedList=Dn("modifyBlocks",kn),fn.removeList=Dn("modifyBlocks",Bn),fn.increaseListLevel=Dn("modifyBlocks",xn),fn.decreaseListLevel=Dn("modifyBlocks",Ln),R.getNodeBefore=kt,R.getNodeAfter=Bt,R.insertNodeInRange=xt,R.extractContentsOfRange=Lt,R.deleteContentsOfRange=At,R.insertTreeFragmentIntoRange=Ot,R.isNodeContainedInRange=Rt,R.moveRangeBoundariesDownTree=Dt,R.moveRangeBoundariesUpTree=Ut,R.getStartBlockOfRange=Pt,R.getEndBlockOfRange=It,R.contentWalker=wt,R.rangeDoesStartAtBlockBoundary=Ft,R.rangeDoesEndAtBlockBoundary=Mt,R.expandRangeToBlockBoundaries=Ht,R.onPaste=cn,R.addLinks=On,R.splitBlock=_n,R.startSelectionId=vn,R.endSelectionId=Cn,"object"==typeof exports?module.exports=R:"function"==typeof define&&define.amd?define(function(){return R}):(J.Squire=R,top!==J&&"true"===e.documentElement.getAttribute("data-squireinit")&&(J.editor=new R(e),J.onEditorLoad&&(J.onEditorLoad(J.editor),J.onEditorLoad=null)))}(document);
\ No newline at end of file
diff --git a/source/Constants.js b/source/Constants.js
index aeec0e2..dbb62dc 100644
--- a/source/Constants.js
+++ b/source/Constants.js
@@ -43,6 +43,7 @@ var cantFocusEmptyTextNodes = isIElt11 || isWebKit;
 var losesSelectionOnBlur = isIElt11;
 
 var canObserveMutations = typeof MutationObserver !== 'undefined';
+var canWeakMap = typeof WeakMap !== 'undefined';
 
 // Use [^ \t\r\n] instead of \S so that nbsp does not count as white-space
 var notWS = /[^ \t\r\n]/;
diff --git a/source/Editor.js b/source/Editor.js
index fa3d837..d16ab84 100644
--- a/source/Editor.js
+++ b/source/Editor.js
@@ -746,6 +746,9 @@ proto._keyUpDetectChange = function ( event ) {
 };
 
 proto._docWasChanged = function () {
+    if ( canWeakMap ) {
+        nodeCategoryCache = new WeakMap();
+    }
     if ( this._ignoreAllChanges ) {
         return;
     }
diff --git a/source/Node.js b/source/Node.js
index 4ad05ba..c68b079 100644
--- a/source/Node.js
+++ b/source/Node.js
@@ -22,25 +22,48 @@ function every ( nodeList, fn ) {
 
 // ---
 
+var UNKNOWN = 0;
+var INLINE = 1;
+var BLOCK = 2;
+var CONTAINER = 3;
+
+var nodeCategoryCache = canWeakMap ? new WeakMap() : null;
+
 function isLeaf ( node ) {
-    return node.nodeType === ELEMENT_NODE &&
-        !!leafNodeNames[ node.nodeName ];
+    return node.nodeType === ELEMENT_NODE && !!leafNodeNames[ node.nodeName ];
 }
-function isInline ( node ) {
-    return inlineNodeNames.test( node.nodeName ) &&
+function getNodeCategory ( node ) {
+    if ( canWeakMap && nodeCategoryCache.has( node ) ) {
+        return nodeCategoryCache.get( node );
+    }
+    var type = node.nodeType;
+    var nodeCategory;
+    if ( type === TEXT_NODE ) {
+        nodeCategory = INLINE;
+    } else if ( type !== ELEMENT_NODE && type !== DOCUMENT_FRAGMENT_NODE ) {
+        nodeCategory = UNKNOWN;
+    } else if ( !every( node.childNodes, isInline ) ) {
         // Malformed HTML can have block tags inside inline tags. Need to treat
         // these as containers rather than inline. See #239.
-        ( node.nodeType === TEXT_NODE || every( node.childNodes, isInline ) );
+        nodeCategory = CONTAINER;
+    } else if ( inlineNodeNames.test( node.nodeName ) ) {
+        nodeCategory = INLINE;
+    } else {
+        nodeCategory = BLOCK;
+    }
+    if ( canWeakMap ) {
+        nodeCategoryCache.set( node, nodeCategory );
+    }
+    return nodeCategory;
+}
+function isInline ( node ) {
+    return getNodeCategory( node ) === INLINE;
 }
 function isBlock ( node ) {
-    var type = node.nodeType;
-    return ( type === ELEMENT_NODE || type === DOCUMENT_FRAGMENT_NODE ) &&
-        !isInline( node ) && every( node.childNodes, isInline );
+    return getNodeCategory( node ) === BLOCK;
 }
 function isContainer ( node ) {
-    var type = node.nodeType;
-    return ( type === ELEMENT_NODE || type === DOCUMENT_FRAGMENT_NODE ) &&
-        !isInline( node ) && !isBlock( node );
+    return getNodeCategory( node ) === CONTAINER;
 }
 
 function getBlockWalker ( node, root ) {