diff --git a/build/squire-raw.js b/build/squire-raw.js
index 0921684..b1bd333 100644
--- a/build/squire-raw.js
+++ b/build/squire-raw.js
@@ -17,11 +17,6 @@ var START_TO_END = 1;   // Range.START_TO_END
 var END_TO_END = 2;     // Range.END_TO_END
 var END_TO_START = 3;   // Range.END_TO_START
 
-var HIGHLIGHT_CLASS = 'highlight';
-var COLOUR_CLASS = 'colour';
-var FONT_FAMILY_CLASS = 'font';
-var FONT_SIZE_CLASS = 'size';
-
 var ZWS = '\u200B';
 
 var win = doc.defaultView;
@@ -309,11 +304,11 @@ function isOrContains ( parent, node ) {
     return false;
 }
 
-function getPath ( node, root ) {
+function getPath ( node, root, config ) {
     var path = '';
-    var id, className, classNames, dir;
+    var id, className, classNames, dir, styleNames;
     if ( node && node !== root ) {
-        path = getPath( node.parentNode, root );
+        path = getPath( node.parentNode, root, config );
         if ( node.nodeType === ELEMENT_NODE ) {
             path += ( path ? '>' : '' ) + node.nodeName;
             if ( id = node.id ) {
@@ -329,19 +324,20 @@ function getPath ( node, root ) {
                 path += '[dir=' + dir + ']';
             }
             if ( classNames ) {
-                if ( indexOf.call( classNames, HIGHLIGHT_CLASS ) > -1 ) {
+                styleNames = config.classNames;
+                if ( indexOf.call( classNames, styleNames.highlight ) > -1 ) {
                     path += '[backgroundColor=' +
                         node.style.backgroundColor.replace( / /g,'' ) + ']';
                 }
-                if ( indexOf.call( classNames, COLOUR_CLASS ) > -1 ) {
+                if ( indexOf.call( classNames, styleNames.colour ) > -1 ) {
                     path += '[color=' +
                         node.style.color.replace( / /g,'' ) + ']';
                 }
-                if ( indexOf.call( classNames, FONT_FAMILY_CLASS ) > -1 ) {
+                if ( indexOf.call( classNames, styleNames.fontFamily ) > -1 ) {
                     path += '[fontFamily=' +
                         node.style.fontFamily.replace( / /g,'' ) + ']';
                 }
-                if ( indexOf.call( classNames, FONT_SIZE_CLASS ) > -1 ) {
+                if ( indexOf.call( classNames, styleNames.fontSize ) > -1 ) {
                     path += '[fontSize=' + node.style.fontSize + ']';
                 }
             }
@@ -1789,18 +1785,18 @@ var fontSizes = {
 var styleToSemantic = {
     backgroundColor: {
         regexp: notWS,
-        replace: function ( doc, colour ) {
+        replace: function ( doc, classNames, colour ) {
             return createElement( doc, 'SPAN', {
-                'class': HIGHLIGHT_CLASS,
+                'class': classNames.highlight,
                 style: 'background-color:' + colour
             });
         }
     },
     color: {
         regexp: notWS,
-        replace: function ( doc, colour ) {
+        replace: function ( doc, classNames, colour ) {
             return createElement( doc, 'SPAN', {
-                'class': COLOUR_CLASS,
+                'class': classNames.colour,
                 style: 'color:' + colour
             });
         }
@@ -1819,18 +1815,18 @@ var styleToSemantic = {
     },
     fontFamily: {
         regexp: notWS,
-        replace: function ( doc, family ) {
+        replace: function ( doc, classNames, family ) {
             return createElement( doc, 'SPAN', {
-                'class': FONT_FAMILY_CLASS,
+                'class': classNames.fontFamily,
                 style: 'font-family:' + family
             });
         }
     },
     fontSize: {
         regexp: notWS,
-        replace: function ( doc, size ) {
+        replace: function ( doc, classNames, size ) {
             return createElement( doc, 'SPAN', {
-                'class': FONT_SIZE_CLASS,
+                'class': classNames.fontSize,
                 style: 'font-size:' + size
             });
         }
@@ -1852,7 +1848,7 @@ var replaceWithTag = function ( tag ) {
     };
 };
 
-var replaceStyles = function ( node, parent ) {
+var replaceStyles = function ( node, parent, config ) {
     var style = node.style;
     var doc = node.ownerDocument;
     var attr, converter, css, newTreeBottom, newTreeTop, el;
@@ -1861,7 +1857,7 @@ var replaceStyles = function ( node, parent ) {
         converter = styleToSemantic[ attr ];
         css = style[ attr ];
         if ( css && converter.regexp.test( css ) ) {
-            el = converter.replace( doc, css );
+            el = converter.replace( doc, config.classNames, css );
             if ( !newTreeTop ) {
                 newTreeTop = el;
             }
@@ -1892,16 +1888,17 @@ var stylesRewriters = {
     EM: replaceWithTag( 'I' ),
     INS: replaceWithTag( 'U' ),
     STRIKE: replaceWithTag( 'S' ),
-    FONT: function ( node, parent ) {
-        var face = node.face,
-            size = node.size,
-            colour = node.color,
-            doc = node.ownerDocument,
-            fontSpan, sizeSpan, colourSpan,
-            newTreeBottom, newTreeTop;
+    FONT: function ( node, parent, config ) {
+        var face = node.face;
+        var size = node.size;
+        var colour = node.color;
+        var doc = node.ownerDocument;
+        var classNames = config.classNames;
+        var fontSpan, sizeSpan, colourSpan;
+        var newTreeBottom, newTreeTop;
         if ( face ) {
             fontSpan = createElement( doc, 'SPAN', {
-                'class': FONT_FAMILY_CLASS,
+                'class': classNames.fontFamily,
                 style: 'font-family:' + face
             });
             newTreeTop = fontSpan;
@@ -1909,7 +1906,7 @@ var stylesRewriters = {
         }
         if ( size ) {
             sizeSpan = createElement( doc, 'SPAN', {
-                'class': FONT_SIZE_CLASS,
+                'class': classNames.fontSize,
                 style: 'font-size:' + fontSizes[ size ] + 'px'
             });
             if ( !newTreeTop ) {
@@ -1925,7 +1922,7 @@ var stylesRewriters = {
                 colour = '#' + colour;
             }
             colourSpan = createElement( doc, 'SPAN', {
-                'class': COLOUR_CLASS,
+                'class': classNames.colour,
                 style: 'color:' + colour
             });
             if ( !newTreeTop ) {
@@ -1943,9 +1940,9 @@ var stylesRewriters = {
         newTreeBottom.appendChild( empty( node ) );
         return newTreeBottom;
     },
-    TT: function ( node, parent ) {
+    TT: function ( node, parent, config ) {
         var el = createElement( node.ownerDocument, 'SPAN', {
-            'class': FONT_FAMILY_CLASS,
+            'class': config.classNames.fontFamily,
             style: 'font-family:menlo,consolas,"courier new",monospace'
         });
         parent.replaceChild( el, node );
@@ -1969,7 +1966,7 @@ var walker = new TreeWalker( null, SHOW_TEXT|SHOW_ELEMENT, function () {
        and whitespace nodes.
     2. Convert inline tags into our preferred format.
 */
-var cleanTree = function cleanTree ( node, preserveWS ) {
+var cleanTree = function cleanTree ( node, config, preserveWS ) {
     var children = node.childNodes,
         nonInlineParent, i, l, child, nodeName, nodeType, rewriter, childLength,
         startsWithWS, endsWithWS, data, sibling;
@@ -1988,7 +1985,7 @@ var cleanTree = function cleanTree ( node, preserveWS ) {
         if ( nodeType === ELEMENT_NODE ) {
             childLength = child.childNodes.length;
             if ( rewriter ) {
-                child = rewriter( child, node );
+                child = rewriter( child, node, config );
             } else if ( blacklist.test( nodeName ) ) {
                 node.removeChild( child );
                 i -= 1;
@@ -2001,7 +1998,8 @@ var cleanTree = function cleanTree ( node, preserveWS ) {
                 continue;
             }
             if ( childLength ) {
-                cleanTree( child, preserveWS || ( nodeName === 'PRE' ) );
+                cleanTree( child, config,
+                    preserveWS || ( nodeName === 'PRE' ) );
             }
         } else {
             if ( nodeType === TEXT_NODE ) {
@@ -2634,6 +2632,12 @@ proto.setConfig = function ( config ) {
             li: null,
             a: null
         },
+        classNames: {
+            colour: 'colour',
+            fontFamily: 'font',
+            fontSize: 'size',
+            highlight: 'highlight'
+        },
         leafNodeNames: leafNodeNames,
         undo: {
             documentSizeThreshold: -1, // -1 means no threshold
@@ -3078,7 +3082,7 @@ proto._updatePath = function ( range, force ) {
         this._lastAnchorNode = anchor;
         this._lastFocusNode = focus;
         newPath = ( anchor && focus ) ? ( anchor === focus ) ?
-            getPath( focus, this._root ) : '(selection)' : '';
+            getPath( focus, this._root, this._config ) : '(selection)' : '';
         if ( this._path !== newPath ) {
             this._path = newPath;
             this.fireEvent( 'pathChange', { path: newPath } );
@@ -4149,7 +4153,7 @@ proto.setHTML = function ( html ) {
         frag.appendChild( empty( div ) );
     }
 
-    cleanTree( frag );
+    cleanTree( frag, config );
     cleanupBRs( frag, root, false );
 
     fixContainer( frag, root );
@@ -4335,7 +4339,7 @@ proto.insertHTML = function ( html, isPaste ) {
         };
 
         addLinks( frag, frag, this );
-        cleanTree( frag );
+        cleanTree( frag, config );
         cleanupBRs( frag, root, false );
         removeEmptyInlines( frag );
         frag.normalize();
@@ -4472,57 +4476,61 @@ proto.removeLink = function () {
 };
 
 proto.setFontFace = function ( name ) {
+    var className = this._config.classNames.fontFamily;
     this.changeFormat( name ? {
         tag: 'SPAN',
         attributes: {
-            'class': FONT_FAMILY_CLASS,
+            'class': className,
             style: 'font-family: ' + name + ', sans-serif;'
         }
     } : null, {
         tag: 'SPAN',
-        attributes: { 'class': FONT_FAMILY_CLASS }
+        attributes: { 'class': className }
     });
     return this.focus();
 };
 proto.setFontSize = function ( size ) {
+    var className = this._config.classNames.fontSize;
     this.changeFormat( size ? {
         tag: 'SPAN',
         attributes: {
-            'class': FONT_SIZE_CLASS,
+            'class': className,
             style: 'font-size: ' +
                 ( typeof size === 'number' ? size + 'px' : size )
         }
     } : null, {
         tag: 'SPAN',
-        attributes: { 'class': FONT_SIZE_CLASS }
+        attributes: { 'class': className }
     });
     return this.focus();
 };
 
 proto.setTextColour = function ( colour ) {
+    var className = this._config.classNames.colour;
     this.changeFormat( colour ? {
         tag: 'SPAN',
         attributes: {
-            'class': COLOUR_CLASS,
+            'class': className,
             style: 'color:' + colour
         }
     } : null, {
         tag: 'SPAN',
-        attributes: { 'class': COLOUR_CLASS }
+        attributes: { 'class': className }
     });
     return this.focus();
 };
 
 proto.setHighlightColour = function ( colour ) {
+    var className = this._config.classNames.highlight;
     this.changeFormat( colour ? {
         tag: 'SPAN',
         attributes: {
-            'class': HIGHLIGHT_CLASS,
+            'class': className,
             style: 'background-color:' + colour
         }
     } : colour, {
         tag: 'SPAN',
-        attributes: { 'class': HIGHLIGHT_CLASS }
+        attributes: { 'class': className }
     });
     return this.focus();
 };
diff --git a/build/squire.js b/build/squire.js
index 3542aa7..af379b6 100644
--- a/build/squire.js
+++ b/build/squire.js
@@ -1,2 +1,2 @@
-!function(e,t){"use strict";function n(e,t,n){this.root=this.currentNode=e,this.nodeType=t,this.filter=n}function o(e,t){for(var n=e.length;n--;)if(!t(e[n]))return!1;return!0}function i(e){return e.nodeType===w&&!!ge[e.nodeName]}function r(e){switch(e.nodeType){case F:return ve;case w:case H:if(ce&&Ce.has(e))return Ce.get(e);break;default:return me}var t;return t=o(e.childNodes,a)?pe.test(e.nodeName)?ve:_e:Ne,ce&&Ce.set(e,t),t}function a(e){return r(e)===ve}function s(e){return r(e)===_e}function d(e){return r(e)===Ne}function l(e,t){var o=new n(t,W,s);return o.currentNode=e,o}function c(e,t){return e=l(e,t).previousNode(),e!==t?e:null}function h(e,t){return e=l(e,t).nextNode(),e!==t?e:null}function u(e){return!e.textContent&&!e.querySelector("IMG")}function f(e,t){return!i(e)&&e.nodeType===t.nodeType&&e.nodeName===t.nodeName&&"A"!==e.nodeName&&e.className===t.className&&(!e.style&&!t.style||e.style.cssText===t.style.cssText)}function p(e,t,n){if(e.nodeName!==t)return!1;for(var o in n)if(e.getAttribute(o)!==n[o])return!1;return!0}function g(e,t,n,o){for(;e&&e!==t;){if(p(e,n,o))return e;e=e.parentNode}return null}function m(e,t){for(;t;){if(t===e)return!0;t=t.parentNode}return!1}function v(e,t){var n,o,i,r,a="";return e&&e!==t&&(a=v(e.parentNode,t),e.nodeType===w&&(a+=(a?">":"")+e.nodeName,(n=e.id)&&(a+="#"+n),(o=e.className.trim())&&(i=o.split(/\s\s*/),i.sort(),a+=".",a+=i.join(".")),(r=e.dir)&&(a+="[dir="+r+"]"),i&&(ue.call(i,z)>-1&&(a+="[backgroundColor="+e.style.backgroundColor.replace(/ /g,"")+"]"),ue.call(i,q)>-1&&(a+="[color="+e.style.color.replace(/ /g,"")+"]"),ue.call(i,K)>-1&&(a+="[fontFamily="+e.style.fontFamily.replace(/ /g,"")+"]"),ue.call(i,G)>-1&&(a+="[fontSize="+e.style.fontSize+"]")))),a}function _(e){var t=e.nodeType;return t===w||t===H?e.childNodes.length:e.length||0}function N(e){var t=e.parentNode;return t&&t.removeChild(e),e}function C(e,t){var n=e.parentNode;n&&n.replaceChild(t,e)}function S(e){for(var t=e.ownerDocument.createDocumentFragment(),n=e.childNodes,o=n?n.length:0;o--;)t.appendChild(e.firstChild);return t}function y(e,n,o,i){var r,a,s,d=e.createElement(n);if(o instanceof Array&&(i=o,o=null),o)for(r in o)o[r]!==t&&d.setAttribute(r,o[r]);if(i)for(a=0,s=i.length;a<s;a+=1)d.appendChild(i[a]);return d}function T(e,t){var n,o,r=t.__squire__,s=e.ownerDocument,d=e;if(e===t&&((o=e.firstChild)&&"BR"!==o.nodeName||(n=r.createDefaultBlock(),o?e.replaceChild(n,o):e.appendChild(n),e=n,n=null)),e.nodeType===F)return d;if(a(e)){for(o=e.firstChild;se&&o&&o.nodeType===F&&!o.data;)e.removeChild(o),o=e.firstChild;o||(se?(n=s.createTextNode(Z),r._didAddZWS()):n=s.createTextNode(""))}else if(ae){for(;e.nodeType!==F&&!i(e);){if(!(o=e.firstChild)){n=s.createTextNode("");break}e=o}e.nodeType===F?/^ +$/.test(e.data)&&(e.data=""):i(e)&&e.parentNode.insertBefore(s.createTextNode(""),e)}else if(!e.querySelector("BR"))for(n=y(s,"BR");(o=e.lastElementChild)&&!a(o);)e=o;if(n)try{e.appendChild(n)}catch(t){r.didError({name:"Squire: fixCursor – "+t,message:"Parent: "+e.nodeName+"/"+e.innerHTML+" appendChild: "+n.nodeName})}return d}function E(e,t){var n,o,i,r,s=e.childNodes,l=e.ownerDocument,c=null,h=t.__squire__._config;for(n=0,o=s.length;n<o;n+=1)i=s[n],r="BR"===i.nodeName,!r&&a(i)?(c||(c=y(l,h.blockTag,h.blockAttributes)),c.appendChild(i),n-=1,o-=1):(r||c)&&(c||(c=y(l,h.blockTag,h.blockAttributes)),T(c,t),r?e.replaceChild(c,i):(e.insertBefore(c,i),n+=1,o+=1),c=null),d(i)&&E(i,t);return c&&e.appendChild(T(c,t)),e}function b(e,t,n,o){var i,r,a,s=e.nodeType;if(s===F&&e!==n)return b(e.parentNode,e.splitText(t),n,o);if(s===w){if("number"==typeof t&&(t=t<e.childNodes.length?e.childNodes[t]:null),e===n)return 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n={startContainer:t.startContainer,startOffset:t.startOffset,endContainer:t.endContainer,endOffset:t.endOffset};k(e,n),t.setStart(n.startContainer,n.startOffset),t.setEnd(n.endContainer,n.endOffset)}}function x(e,t,n,o){for(var i,r,a,s=t;(i=s.parentNode)&&i!==o&&i.nodeType===w&&1===i.childNodes.length;)s=i;N(s),a=e.childNodes.length,r=e.lastChild,r&&"BR"===r.nodeName&&(e.removeChild(r),a-=1),e.appendChild(S(t)),n.setStart(e,a),n.collapse(!0),L(e,n),te&&(r=e.lastChild)&&"BR"===r.nodeName&&e.removeChild(r)}function A(e,t){var n,o,i=e.previousSibling,r=e.firstChild,a=e.ownerDocument,s="LI"===e.nodeName;if(!s||r&&/^[OU]L$/.test(r.nodeName))if(i&&f(i,e)){if(!d(i)){if(!s)return;o=y(a,"DIV"),o.appendChild(S(i)),i.appendChild(o)}N(e),n=!d(e),i.appendChild(S(e)),n&&E(i,t),r&&A(r,t)}else s&&(i=y(a,"DIV"),e.insertBefore(i,r),T(i,t))}function O(e){this.isShiftDown=e.shiftKey}function B(e,t,n){var o,i;if(e||(e={}),t)for(o in t)!n&&o in e||(i=t[o],e[o]=i&&i.constructor===Object?B(e[o],i,n):i);return 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MutationObserver(this._docWasChanged.bind(this)),n.observe(e,{childList:!0,attributes:!0,characterData:!0,subtree:!0}),this._mutation=n):this.addEventListener("keyup",this._keyUpDetectChange),this._restoreSelection=!1,this.addEventListener("blur",D),this.addEventListener("mousedown",U),this.addEventListener("touchstart",U),this.addEventListener("focus",P),this._awaitingPaste=!1,this.addEventListener(ee?"beforecut":"cut",nt),this.addEventListener("copy",ot),this.addEventListener("keydown",O),this.addEventListener("keyup",O),this.addEventListener(ee?"beforepaste":"paste",it),this.addEventListener("drop",rt),this.addEventListener(te?"keypress":"keydown",we),this._keyHandlers=Object.create(We),this.setConfig(t),ee&&(i.Text.prototype.splitText=function(e){var t=this.ownerDocument.createTextNode(this.data.slice(e)),n=this.nextSibling,o=this.parentNode,i=this.length-e;return n?o.insertBefore(t,n):o.appendChild(t),i&&this.deleteData(e,i),t}),e.setAttribute("contenteditable","true");try{o.execCommand("enableObjectResizing",!1,"false"),o.execCommand("enableInlineTableEditing",!1,"false")}catch(e){}e.__squire__=this,this.setHTML("")}function D(){this._restoreSelection=!0}function U(){this._restoreSelection=!1}function P(){this._restoreSelection&&this.setSelection(this._lastSelection)}function I(e,t,n){var o,i;for(o=t.firstChild;o;o=i){if(i=o.nextSibling,a(o)){if(o.nodeType===F||"BR"===o.nodeName||"IMG"===o.nodeName){n.appendChild(o);continue}}else if(s(o)){n.appendChild(e.createDefaultBlock([I(e,o,e._doc.createDocumentFragment())]));continue}I(e,o,n)}return n}var w=1,F=3,M=9,H=11,W=1,z="highlight",q="colour",K="font",G="size",Z="​",j=e.defaultView,$=navigator.userAgent,Q=/Android/.test($),V=/iP(?:ad|hone|od)/.test($),Y=/Mac OS X/.test($),X=/Windows 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this._root.blur(),ie&&this.fireEvent("blur"),this};var ht="squire-selection-end";at._saveRangeToBookmark=function(e){var t,n=this.createElement("INPUT",{id:"squire-selection-start",type:"hidden"}),o=this.createElement("INPUT",{id:ht,type:"hidden"});Te(e,n),e.collapse(!1),Te(e,o),2&n.compareDocumentPosition(o)&&(n.id=ht,o.id="squire-selection-start",t=n,n=o,o=t),e.setStartAfter(n),e.setEndBefore(o)},at._getRangeAndRemoveBookmark=function(e){var t=this._root,n=t.querySelector("#squire-selection-start"),o=t.querySelector("#"+ht);if(n&&o){var i=n.parentNode,r=o.parentNode,a=ue.call(i.childNodes,n),s=ue.call(r.childNodes,o);i===r&&(s-=1),N(n),N(o),e||(e=this._doc.createRange()),e.setStart(i,a),e.setEnd(r,s),L(i,e),i!==r&&L(r,e),e.collapsed&&(i=e.startContainer,i.nodeType===F&&(r=i.childNodes[e.startOffset],r&&r.nodeType===F||(r=i.childNodes[e.startOffset-1]),r&&r.nodeType===F&&(e.setStart(r,0),e.collapse(!0))))}return e||null},at._keyUpDetectChange=function(e){var 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i,r,a=this._root,s=o.commonAncestorContainer;if(g(s,a,e,t))return!0;if(s.nodeType===F)return!1;i=new n(s,4,function(e){return Le(o,e,!0)},!1);for(var d=!1;r=i.nextNode();){if(!g(r,a,e,t))return!1;d=!0}return d},at.getFontInfo=function(e){var n,o,i,r={color:t,backgroundColor:t,family:t,size:t},a=0;if(!e&&!(e=this.getSelection()))return r;if(n=e.commonAncestorContainer,e.collapsed||n.nodeType===F)for(n.nodeType===F&&(n=n.parentNode);a<4&&n;)(o=n.style)&&(!r.color&&(i=o.color)&&(r.color=i,a+=1),!r.backgroundColor&&(i=o.backgroundColor)&&(r.backgroundColor=i,a+=1),!r.family&&(i=o.fontFamily)&&(r.family=i,a+=1),!r.size&&(i=o.fontSize)&&(r.size=i,a+=1)),n=n.parentNode;return r},at._addFormat=function(e,t,o){var i,r,s,d,l,c,h,u,f=this._root;if(o.collapsed){for(i=T(this.createElement(e,t),f),Te(o,i),o.setStart(i.firstChild,i.firstChild.length),o.collapse(!0),u=i;a(u);)u=u.parentNode;ct(u,i)}else{if(r=new 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i||(i=s.blockTag,r=s.blockAttributes),p(a,i,r)||(t=y(a.ownerDocument,i,r),a.dir&&(t.dir=a.dir),C(a,t),t.appendChild(S(a)),a=t),a};at.forEachBlock=function(e,t,n){if(!n&&!(n=this.getSelection()))return this;t&&this.saveUndoState(n);var o=this._root,i=Oe(n,o),r=Be(n,o);if(i&&r)do{if(e(i)||i===r)break}while(i=h(i,o));return t&&(this.setSelection(n),this._updatePath(n,!0),le||this._docWasChanged()),this},at.modifyBlocks=function(e,t){if(!t&&!(t=this.getSelection()))return this;this._recordUndoState(t,this._isInUndoState);var n,o=this._root;return Pe(t,o),Ae(t,o,o,o),n=Ee(t,o,o),Te(t,e.call(this,n)),t.endOffset<t.endContainer.childNodes.length&&A(t.endContainer.childNodes[t.endOffset],o),A(t.startContainer.childNodes[t.startOffset],o),this._getRangeAndRemoveBookmark(t),this.setSelection(t),this._updatePath(t,!0),le||this._docWasChanged(),this};var pt=function(e){return this.createElement("BLOCKQUOTE",this._config.tagAttributes.blockquote,[e])},gt=function(e){var 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this},nt.hasFormat=function(e,t,i){if(e=e.toUpperCase(),t||(t={}),!i&&!(i=this.getSelection()))return!1;!i.collapsed&&i.startContainer.nodeType===F&&i.startOffset===i.startContainer.length&&i.startContainer.nextSibling&&i.setStartBefore(i.startContainer.nextSibling),!i.collapsed&&i.endContainer.nodeType===F&&0===i.endOffset&&i.endContainer.previousSibling&&i.setEndAfter(i.endContainer.previousSibling);var o,r,a=this._root,s=i.commonAncestorContainer;if(g(s,a,e,t))return!0;if(s.nodeType===F)return!1;o=new n(s,4,function(e){return Te(i,e,!0)},!1);for(var d=!1;r=o.nextNode();){if(!g(r,a,e,t))return!1;d=!0}return d},nt.getFontInfo=function(e){var n,i,o,r={color:t,backgroundColor:t,family:t,size:t},a=0;if(!e&&!(e=this.getSelection()))return 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t&&(this.setSelection(n),this._updatePath(n,!0),re||this._docWasChanged()),this},nt.modifyBlocks=function(e,t){if(!t&&!(t=this.getSelection()))return this;this._recordUndoState(t,this._isInUndoState);var n,i=this._root;return Be(t,i),be(t,i,i,i),n=Ce(t,i,i),_e(t,e.call(this,n)),t.endOffset<t.endContainer.childNodes.length&&A(t.endContainer.childNodes[t.endOffset],i),A(t.startContainer.childNodes[t.startOffset],i),this._getRangeAndRemoveBookmark(t),this.setSelection(t),this._updatePath(t,!0),re||this._docWasChanged(),this};var ct=function(e){return this.createElement("BLOCKQUOTE",this._config.tagAttributes.blockquote,[e])},ht=function(e){var t=this._root,n=e.querySelectorAll("blockquote");return Array.prototype.filter.call(n,function(e){return!g(e.parentNode,t,"BLOCKQUOTE")}).forEach(function(e){C(e,S(e))}),e},ut=function(){return this.createDefaultBlock([this.createElement("INPUT",{id:"squire-selection-start",type:"hidden"}),this.createElement("INPUT",{id:st,type:"hidden"})])},ft=function(e,t,n){for(var i,o,r,a,s=l(t,e._root),d=e._config.tagAttributes,c=d[n.toLowerCase()],h=d.li;i=s.nextNode();)"LI"===i.parentNode.nodeName&&(i=i.parentNode,s.currentNode=i.lastChild),"LI"!==i.nodeName?(a=e.createElement("LI",h),i.dir&&(a.dir=i.dir),(r=i.previousSibling)&&r.nodeName===n?(r.appendChild(a),_(i)):C(i,e.createElement(n,c,[a])),a.appendChild(S(i)),s.currentNode=a):(i=i.parentNode,(o=i.nodeName)!==n&&/^[OU]L$/.test(o)&&C(i,e.createElement(n,c,[S(i)])))},pt=function(e){return ft(this,e,"UL"),e},gt=function(e){return ft(this,e,"OL"),e},mt=function(e){var t,n,i,o,r,a=e.querySelectorAll("UL, OL"),d=e.querySelectorAll("LI"),l=this._root;for(t=0,n=a.length;t<n;t+=1)i=a[t],o=S(i),E(o,l),C(i,o);for(t=0,n=d.length;t<n;t+=1)r=d[t],s(r)?C(r,this.createDefaultBlock([S(r)])):(E(r,l),C(r,S(r)));return e},vt=function(e,t){for(var n=e.commonAncestorContainer,i=e.startContainer,o=e.endContainer;n&&n!==t&&!/^[OU]L$/.test(n.nodeName);)n=n.parentNode;if(!n||n===t)return null;for(i===n&&(i=i.childNodes[e.startOffset]),o===n&&(o=o.childNodes[e.endOffset]);i&&i.parentNode!==n;)i=i.parentNode;for(;o&&o.parentNode!==n;)o=o.parentNode;return[n,i,o]};nt.increaseListLevel=function(e){if(!e&&!(e=this.getSelection()))return this.focus();var t=this._root,n=vt(e,t);if(!n)return this.focus();var i=n[0],o=n[1],r=n[2];if(!o||o===i.firstChild)return this.focus();this._recordUndoState(e,this._isInUndoState);var a,s,d=i.nodeName,l=o.previousSibling;l.nodeName!==d&&(a=this._config.tagAttributes[d.toLowerCase()],l=this.createElement(d,a),i.insertBefore(l,o));do{s=o===r?null:o.nextSibling,l.appendChild(o)}while(o=s);return s=l.nextSibling,s&&A(s,t),this._getRangeAndRemoveBookmark(e),this.setSelection(e),this._updatePath(e,!0),re||this._docWasChanged(),this.focus()},nt.decreaseListLevel=function(e){if(!e&&!(e=this.getSelection()))return this.focus();var t=this._root,n=vt(e,t);if(!n)return this.focus();var i=n[0],o=n[1],r=n[2];o||(o=i.firstChild),r||(r=i.lastChild),this._recordUndoState(e,this._isInUndoState);var a,s=i.parentNode,d=r.nextSibling?b(i,r.nextSibling,s,t):i.nextSibling;if(s!==t&&"LI"===s.nodeName){for(s=s.parentNode;d;)a=d.nextSibling,r.appendChild(d),d=a;d=i.parentNode.nextSibling}var l=!/^[OU]L$/.test(s.nodeName);do{a=o===r?null:o.nextSibling,i.removeChild(o),l&&"LI"===o.nodeName&&(o=this.createDefaultBlock([S(o)])),s.insertBefore(o,d)}while(o=a);return i.firstChild||_(i),d&&A(d,t),this._getRangeAndRemoveBookmark(e),this.setSelection(e),this._updatePath(e,!0),re||this._docWasChanged(),this.focus()},nt._ensureBottomLine=function(){var e=this._root,t=e.lastElementChild;t&&t.nodeName===this._config.blockTag&&s(t)||e.appendChild(this.createDefaultBlock())},nt.setKeyHandler=function(e,t){return this._keyHandlers[e]=t,this},nt._getHTML=function(){return this._root.innerHTML},nt._setHTML=function(e){var t=this._root,n=t;n.innerHTML=e;do{T(n,t)}while(n=h(n,t));this._ignoreChange=!0},nt.getHTML=function(e){var t,n,i,o,r,a,s=[];if(e&&(a=this.getSelection())&&this._saveRangeToBookmark(a),ne)for(t=this._root,n=t;n=h(n,t);)n.textContent||n.querySelector("BR")||(i=this.createElement("BR"),n.appendChild(i),s.push(i));if(o=this._getHTML().replace(/\u200B/g,""),ne)for(r=s.length;r--;)_(s[r]);return a&&this._getRangeAndRemoveBookmark(a),o},nt.setHTML=function(e){var t,n,i,o=this._config,r=o.isSetHTMLSanitized?o.sanitizeToDOMFragment:null,a=this._root;"function"==typeof r?n=r(e,!1,this):(t=this.createElement("DIV"),t.innerHTML=e,n=this._doc.createDocumentFragment(),n.appendChild(S(t))),Ze(n,o),Ve(n,a,!1),E(n,a);for(var s=n;s=h(s,a);)T(s,a);for(this._ignoreChange=!0;i=a.lastChild;)a.removeChild(i);a.appendChild(n),T(a,a),this._undoIndex=-1,this._undoStack.length=0,this._undoStackLength=0,this._isInUndoState=!1;var d=this._getRangeAndRemoveBookmark()||this.createRange(a.firstChild,0);return this.saveUndoState(d),this._lastSelection=d,D.call(this),this._updatePath(d,!0),this},nt.insertElement=function(e,t){if(t||(t=this.getSelection()),t.collapse(!0),a(e))_e(t,e),t.setStartAfter(e);else{for(var n,i,o=this._root,r=ke(t,o)||o;r!==o&&!r.nextSibling;)r=r.parentNode;r!==o&&(n=r.parentNode,i=b(n,r.nextSibling,o,o)),i?o.insertBefore(e,i):(o.appendChild(e),i=this.createDefaultBlock(),o.appendChild(i)),t.setStart(i,0),t.setEnd(i,0),Ee(t)}return this.focus(),this.setSelection(t),this._updatePath(t),re||this._docWasChanged(),this},nt.insertImage=function(e,t){var n=this.createElement("IMG",B({src:e},t,!0));return this.insertElement(n),n};var Nt=/\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)(?:\?[^&?\s]+=[^&?\s]+(?:&[^&?\s]+=[^&?\s]+)*)?/i,_t=function(e,t,i){for(var o,r,a,s,d,l,c,h=e.ownerDocument,u=new n(e,4,function(e){return!g(e,t,"A")},!1),f=i._config.tagAttributes.a;o=u.nextNode();)for(r=o.data,a=o.parentNode;s=Nt.exec(r);)d=s.index,l=d+s[0].length,d&&(c=h.createTextNode(r.slice(0,d)),a.insertBefore(c,o)),c=i.createElement("A",B({href:s[1]?/^(?:ht|f)tps?:/i.test(s[1])?s[1]:"http://"+s[1]:"mailto:"+s[0]},f,!1)),c.textContent=r.slice(d,l),a.insertBefore(c,o),o.data=r=r.slice(l)};nt.insertHTML=function(e,t){var n,i,o,r,a,s,d,l=this._config,c=l.isInsertedHTMLSanitized?l.sanitizeToDOMFragment:null,u=this.getSelection(),f=this._doc;"function"==typeof c?r=c(e,t,this):(t&&(n=e.indexOf("\x3c!--StartFragment--\x3e"),i=e.lastIndexOf("\x3c!--EndFragment--\x3e"),n>-1&&i>-1&&(e=e.slice(n+20,i))),/<\/td>((?!<\/tr>)[\s\S])*$/i.test(e)&&(e="<TR>"+e+"</TR>"),/<\/tr>((?!<\/table>)[\s\S])*$/i.test(e)&&(e="<TABLE>"+e+"</TABLE>"),o=this.createElement("DIV"),o.innerHTML=e,r=f.createDocumentFragment(),r.appendChild(S(o))),this.saveUndoState(u);try{for(a=this._root,s=r,d={fragment:r,preventDefault:function(){this.defaultPrevented=!0},defaultPrevented:!1},_t(r,r,this),Ze(r,l),Ve(r,a,!1),je(r),r.normalize();s=h(s,r);)T(s,a);t&&this.fireEvent("willPaste",d),d.defaultPrevented||(ye(u,d.fragment,a),re||this._docWasChanged(),u.collapse(!1),this._ensureBottomLine()),this.setSelection(u),this._updatePath(u,!0),t&&this.focus()}catch(e){this.didError(e)}return this};var Ct=function(e){return e.split("&").join("&amp;").split("<").join("&lt;").split(">").join("&gt;").split('"').join("&quot;")};nt.insertPlainText=function(e,t){var n,i,o,r,a=e.split("\n"),s=this._config,d=s.blockTag,l=s.blockAttributes,c="</"+d+">",h="<"+d;for(n in l)h+=" "+n+'="'+Ct(l[n])+'"';for(h+=">",i=0,o=a.length;i<o;i+=1)r=a[i],r=Ct(r).replace(/ (?= )/g,"&nbsp;"),a[i]=h+(r||"<BR>")+c;return this.insertHTML(a.join(""),t)};var St=function(e,t,n){return function(){return this[e](t,n),this.focus()}};nt.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},nt.bold=St("changeFormat",{tag:"B"}),nt.italic=St("changeFormat",{tag:"I"}),nt.underline=St("changeFormat",{tag:"U"}),nt.strikethrough=St("changeFormat",{tag:"S"}),nt.subscript=St("changeFormat",{tag:"SUB"},{tag:"SUP"}),nt.superscript=St("changeFormat",{tag:"SUP"},{tag:"SUB"}),nt.removeBold=St("changeFormat",null,{tag:"B"}),nt.removeItalic=St("changeFormat",null,{tag:"I"}),nt.removeUnderline=St("changeFormat",null,{tag:"U"}),nt.removeStrikethrough=St("changeFormat",null,{tag:"S"}),nt.removeSubscript=St("changeFormat",null,{tag:"SUB"}),nt.removeSuperscript=St("changeFormat",null,{tag:"SUP"}),nt.makeLink=function(e,t){var n=this.getSelection();if(n.collapsed){var i=e.indexOf(":")+1;if(i)for(;"/"===e[i];)i+=1;_e(n,this._doc.createTextNode(e.slice(i)))}return t=B(B({href:e},t,!0),this._config.tagAttributes.a,!1),this.changeFormat({tag:"A",attributes:t},{tag:"A"},n),this.focus()},nt.removeLink=function(){return this.changeFormat(null,{tag:"A"},this.getSelection(),!0),this.focus()},nt.setFontFace=function(e){var t=this._config.classNames.fontFamily;return this.changeFormat(e?{tag:"SPAN",attributes:{class:t,style:"font-family: "+e+", sans-serif;"}}:null,{tag:"SPAN",attributes:{class:t}}),this.focus()},nt.setFontSize=function(e){var t=this._config.classNames.fontSize;return this.changeFormat(e?{tag:"SPAN",attributes:{class:t,style:"font-size: "+("number"==typeof e?e+"px":e)}}:null,{tag:"SPAN",attributes:{class:t}}),this.focus()},nt.setTextColour=function(e){var t=this._config.classNames.colour;return this.changeFormat(e?{tag:"SPAN",attributes:{class:t,style:"color:"+e}}:null,{tag:"SPAN",attributes:{class:t}}),this.focus()},nt.setHighlightColour=function(e){var t=this._config.classNames.highlight;return this.changeFormat(e?{tag:"SPAN",attributes:{class:t,style:"background-color:"+e}}:e,{tag:"SPAN",attributes:{class:t}}),this.focus()},nt.setTextAlignment=function(e){return this.forEachBlock(function(t){var n=t.className.split(/\s+/).filter(function(e){return!!e&&!/^align/.test(e)}).join(" ");e?(t.className=n+" align-"+e,t.style.textAlign=e):(t.className=n,t.style.textAlign="")},!0),this.focus()},nt.setTextDirection=function(e){return this.forEachBlock(function(t){e?t.dir=e:t.removeAttribute("dir")},!0),this.focus()},nt.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||(Be(e,t),n=t),n.nodeType===F)return this;this.saveUndoState(e),be(e,n,n,t);for(var i,o,r=n.ownerDocument,a=e.startContainer,d=e.startOffset,l=e.endContainer,c=e.endOffset,h=r.createDocumentFragment(),u=r.createDocumentFragment(),f=b(l,c,n,t),p=b(a,d,n,t);p!==f;)i=p.nextSibling,h.appendChild(p),p=i;return I(this,h,u),u.normalize(),p=u.firstChild,i=u.lastChild,o=n.childNodes,p?(n.insertBefore(u,f),d=de.call(o,p),c=de.call(o,i)+1):(d=de.call(o,f),c=d),e.setStart(n,d),e.setEnd(n,c),L(n,e),Ee(e),this.setSelection(e),this._updatePath(e,!0),this.focus()},nt.increaseQuoteLevel=St("modifyBlocks",ct),nt.decreaseQuoteLevel=St("modifyBlocks",ht),nt.makeUnorderedList=St("modifyBlocks",pt),nt.makeOrderedList=St("modifyBlocks",gt),nt.removeList=St("modifyBlocks",mt),R.isInline=a,R.isBlock=s,R.isContainer=d,R.getBlockWalker=l,R.getPreviousBlock=c,R.getNextBlock=h,R.areAlike=f,R.hasTagAttributes=p,R.getNearest=g,R.isOrContains=m,R.detach=_,R.replaceWith=C,R.empty=S,R.getNodeBefore=ve,R.getNodeAfter=Ne,R.insertNodeInRange=_e,R.extractContentsOfRange=Ce,R.deleteContentsOfRange=Se,R.insertTreeFragmentIntoRange=ye,R.isNodeContainedInRange=Te,R.moveRangeBoundariesDownTree=Ee,R.moveRangeBoundariesUpTree=be,R.getStartBlockOfRange=ke,R.getEndBlockOfRange=Le,R.contentWalker=xe,R.rangeDoesStartAtBlockBoundary=Ae,R.rangeDoesEndAtBlockBoundary=Oe,R.expandRangeToBlockBoundaries=Be,R.onPaste=et,R.addLinks=_t,R.splitBlock=lt,R.startSelectionId="squire-selection-start",R.endSelectionId=st,"object"==typeof exports?module.exports=R:"function"==typeof define&&define.amd?define(function(){return R}):(q.Squire=R,top!==q&&"true"===e.documentElement.getAttribute("data-squireinit")&&(q.editor=new R(e),q.onEditorLoad&&(q.onEditorLoad(q.editor),q.onEditorLoad=null)))}(document);
\ No newline at end of file
diff --git a/source/Clean.js b/source/Clean.js
index 3fe01f1..f844b81 100644
--- a/source/Clean.js
+++ b/source/Clean.js
@@ -13,18 +13,18 @@ var fontSizes = {
 var styleToSemantic = {
     backgroundColor: {
         regexp: notWS,
-        replace: function ( doc, colour ) {
+        replace: function ( doc, classNames, colour ) {
             return createElement( doc, 'SPAN', {
-                'class': HIGHLIGHT_CLASS,
+                'class': classNames.highlight,
                 style: 'background-color:' + colour
             });
         }
     },
     color: {
         regexp: notWS,
-        replace: function ( doc, colour ) {
+        replace: function ( doc, classNames, colour ) {
             return createElement( doc, 'SPAN', {
-                'class': COLOUR_CLASS,
+                'class': classNames.colour,
                 style: 'color:' + colour
             });
         }
@@ -43,18 +43,18 @@ var styleToSemantic = {
     },
     fontFamily: {
         regexp: notWS,
-        replace: function ( doc, family ) {
+        replace: function ( doc, classNames, family ) {
             return createElement( doc, 'SPAN', {
-                'class': FONT_FAMILY_CLASS,
+                'class': classNames.fontFamily,
                 style: 'font-family:' + family
             });
         }
     },
     fontSize: {
         regexp: notWS,
-        replace: function ( doc, size ) {
+        replace: function ( doc, classNames, size ) {
             return createElement( doc, 'SPAN', {
-                'class': FONT_SIZE_CLASS,
+                'class': classNames.fontSize,
                 style: 'font-size:' + size
             });
         }
@@ -76,7 +76,7 @@ var replaceWithTag = function ( tag ) {
     };
 };
 
-var replaceStyles = function ( node, parent ) {
+var replaceStyles = function ( node, parent, config ) {
     var style = node.style;
     var doc = node.ownerDocument;
     var attr, converter, css, newTreeBottom, newTreeTop, el;
@@ -85,7 +85,7 @@ var replaceStyles = function ( node, parent ) {
         converter = styleToSemantic[ attr ];
         css = style[ attr ];
         if ( css && converter.regexp.test( css ) ) {
-            el = converter.replace( doc, css );
+            el = converter.replace( doc, config.classNames, css );
             if ( !newTreeTop ) {
                 newTreeTop = el;
             }
@@ -116,16 +116,17 @@ var stylesRewriters = {
     EM: replaceWithTag( 'I' ),
     INS: replaceWithTag( 'U' ),
     STRIKE: replaceWithTag( 'S' ),
-    FONT: function ( node, parent ) {
-        var face = node.face,
-            size = node.size,
-            colour = node.color,
-            doc = node.ownerDocument,
-            fontSpan, sizeSpan, colourSpan,
-            newTreeBottom, newTreeTop;
+    FONT: function ( node, parent, config ) {
+        var face = node.face;
+        var size = node.size;
+        var colour = node.color;
+        var doc = node.ownerDocument;
+        var classNames = config.classNames;
+        var fontSpan, sizeSpan, colourSpan;
+        var newTreeBottom, newTreeTop;
         if ( face ) {
             fontSpan = createElement( doc, 'SPAN', {
-                'class': FONT_FAMILY_CLASS,
+                'class': classNames.fontFamily,
                 style: 'font-family:' + face
             });
             newTreeTop = fontSpan;
@@ -133,7 +134,7 @@ var stylesRewriters = {
         }
         if ( size ) {
             sizeSpan = createElement( doc, 'SPAN', {
-                'class': FONT_SIZE_CLASS,
+                'class': classNames.fontSize,
                 style: 'font-size:' + fontSizes[ size ] + 'px'
             });
             if ( !newTreeTop ) {
@@ -149,7 +150,7 @@ var stylesRewriters = {
                 colour = '#' + colour;
             }
             colourSpan = createElement( doc, 'SPAN', {
-                'class': COLOUR_CLASS,
+                'class': classNames.colour,
                 style: 'color:' + colour
             });
             if ( !newTreeTop ) {
@@ -167,9 +168,9 @@ var stylesRewriters = {
         newTreeBottom.appendChild( empty( node ) );
         return newTreeBottom;
     },
-    TT: function ( node, parent ) {
+    TT: function ( node, parent, config ) {
         var el = createElement( node.ownerDocument, 'SPAN', {
-            'class': FONT_FAMILY_CLASS,
+            'class': config.classNames.fontFamily,
             style: 'font-family:menlo,consolas,"courier new",monospace'
         });
         parent.replaceChild( el, node );
@@ -193,7 +194,7 @@ var walker = new TreeWalker( null, SHOW_TEXT|SHOW_ELEMENT, function () {
        and whitespace nodes.
     2. Convert inline tags into our preferred format.
 */
-var cleanTree = function cleanTree ( node, preserveWS ) {
+var cleanTree = function cleanTree ( node, config, preserveWS ) {
     var children = node.childNodes,
         nonInlineParent, i, l, child, nodeName, nodeType, rewriter, childLength,
         startsWithWS, endsWithWS, data, sibling;
@@ -212,7 +213,7 @@ var cleanTree = function cleanTree ( node, preserveWS ) {
         if ( nodeType === ELEMENT_NODE ) {
             childLength = child.childNodes.length;
             if ( rewriter ) {
-                child = rewriter( child, node );
+                child = rewriter( child, node, config );
             } else if ( blacklist.test( nodeName ) ) {
                 node.removeChild( child );
                 i -= 1;
@@ -225,7 +226,8 @@ var cleanTree = function cleanTree ( node, preserveWS ) {
                 continue;
             }
             if ( childLength ) {
-                cleanTree( child, preserveWS || ( nodeName === 'PRE' ) );
+                cleanTree( child, config,
+                    preserveWS || ( nodeName === 'PRE' ) );
             }
         } else {
             if ( nodeType === TEXT_NODE ) {
diff --git a/source/Constants.js b/source/Constants.js
index a33a793..0c3a01d 100644
--- a/source/Constants.js
+++ b/source/Constants.js
@@ -13,11 +13,6 @@ var START_TO_END = 1;   // Range.START_TO_END
 var END_TO_END = 2;     // Range.END_TO_END
 var END_TO_START = 3;   // Range.END_TO_START
 
-var HIGHLIGHT_CLASS = 'highlight';
-var COLOUR_CLASS = 'colour';
-var FONT_FAMILY_CLASS = 'font';
-var FONT_SIZE_CLASS = 'size';
-
 var ZWS = '\u200B';
 
 var win = doc.defaultView;
diff --git a/source/Editor.js b/source/Editor.js
index 51cec37..abefa21 100644
--- a/source/Editor.js
+++ b/source/Editor.js
@@ -171,6 +171,12 @@ proto.setConfig = function ( config ) {
             li: null,
             a: null
         },
+        classNames: {
+            colour: 'colour',
+            fontFamily: 'font',
+            fontSize: 'size',
+            highlight: 'highlight'
+        },
         leafNodeNames: leafNodeNames,
         undo: {
             documentSizeThreshold: -1, // -1 means no threshold
@@ -615,7 +621,7 @@ proto._updatePath = function ( range, force ) {
         this._lastAnchorNode = anchor;
         this._lastFocusNode = focus;
         newPath = ( anchor && focus ) ? ( anchor === focus ) ?
-            getPath( focus, this._root ) : '(selection)' : '';
+            getPath( focus, this._root, this._config ) : '(selection)' : '';
         if ( this._path !== newPath ) {
             this._path = newPath;
             this.fireEvent( 'pathChange', { path: newPath } );
@@ -1686,7 +1692,7 @@ proto.setHTML = function ( html ) {
         frag.appendChild( empty( div ) );
     }
 
-    cleanTree( frag );
+    cleanTree( frag, config );
     cleanupBRs( frag, root, false );
 
     fixContainer( frag, root );
@@ -1872,7 +1878,7 @@ proto.insertHTML = function ( html, isPaste ) {
         };
 
         addLinks( frag, frag, this );
-        cleanTree( frag );
+        cleanTree( frag, config );
         cleanupBRs( frag, root, false );
         removeEmptyInlines( frag );
         frag.normalize();
@@ -2009,57 +2015,61 @@ proto.removeLink = function () {
 };
 
 proto.setFontFace = function ( name ) {
+    var className = this._config.classNames.fontFamily;
     this.changeFormat( name ? {
         tag: 'SPAN',
         attributes: {
-            'class': FONT_FAMILY_CLASS,
+            'class': className,
             style: 'font-family: ' + name + ', sans-serif;'
         }
     } : null, {
         tag: 'SPAN',
-        attributes: { 'class': FONT_FAMILY_CLASS }
+        attributes: { 'class': className }
     });
     return this.focus();
 };
 proto.setFontSize = function ( size ) {
+    var className = this._config.classNames.fontSize;
     this.changeFormat( size ? {
         tag: 'SPAN',
         attributes: {
-            'class': FONT_SIZE_CLASS,
+            'class': className,
             style: 'font-size: ' +
                 ( typeof size === 'number' ? size + 'px' : size )
         }
     } : null, {
         tag: 'SPAN',
-        attributes: { 'class': FONT_SIZE_CLASS }
+        attributes: { 'class': className }
     });
     return this.focus();
 };
 
 proto.setTextColour = function ( colour ) {
+    var className = this._config.classNames.colour;
     this.changeFormat( colour ? {
         tag: 'SPAN',
         attributes: {
-            'class': COLOUR_CLASS,
+            'class': className,
             style: 'color:' + colour
         }
     } : null, {
         tag: 'SPAN',
-        attributes: { 'class': COLOUR_CLASS }
+        attributes: { 'class': className }
     });
     return this.focus();
 };
 
 proto.setHighlightColour = function ( colour ) {
+    var className = this._config.classNames.highlight;
     this.changeFormat( colour ? {
         tag: 'SPAN',
         attributes: {
-            'class': HIGHLIGHT_CLASS,
+            'class': className,
             style: 'background-color:' + colour
         }
     } : colour, {
         tag: 'SPAN',
-        attributes: { 'class': HIGHLIGHT_CLASS }
+        attributes: { 'class': className }
     });
     return this.focus();
 };
diff --git a/source/Node.js b/source/Node.js
index 222fc5c..2cefc43 100644
--- a/source/Node.js
+++ b/source/Node.js
@@ -129,11 +129,11 @@ function isOrContains ( parent, node ) {
     return false;
 }
 
-function getPath ( node, root ) {
+function getPath ( node, root, config ) {
     var path = '';
-    var id, className, classNames, dir;
+    var id, className, classNames, dir, styleNames;
     if ( node && node !== root ) {
-        path = getPath( node.parentNode, root );
+        path = getPath( node.parentNode, root, config );
         if ( node.nodeType === ELEMENT_NODE ) {
             path += ( path ? '>' : '' ) + node.nodeName;
             if ( id = node.id ) {
@@ -149,19 +149,20 @@ function getPath ( node, root ) {
                 path += '[dir=' + dir + ']';
             }
             if ( classNames ) {
-                if ( indexOf.call( classNames, HIGHLIGHT_CLASS ) > -1 ) {
+                styleNames = config.classNames;
+                if ( indexOf.call( classNames, styleNames.highlight ) > -1 ) {
                     path += '[backgroundColor=' +
                         node.style.backgroundColor.replace( / /g,'' ) + ']';
                 }
-                if ( indexOf.call( classNames, COLOUR_CLASS ) > -1 ) {
+                if ( indexOf.call( classNames, styleNames.colour ) > -1 ) {
                     path += '[color=' +
                         node.style.color.replace( / /g,'' ) + ']';
                 }
-                if ( indexOf.call( classNames, FONT_FAMILY_CLASS ) > -1 ) {
+                if ( indexOf.call( classNames, styleNames.fontFamily ) > -1 ) {
                     path += '[fontFamily=' +
                         node.style.fontFamily.replace( / /g,'' ) + ']';
                 }
-                if ( indexOf.call( classNames, FONT_SIZE_CLASS ) > -1 ) {
+                if ( indexOf.call( classNames, styleNames.fontSize ) > -1 ) {
                     path += '[fontSize=' + node.style.fontSize + ']';
                 }
             }