diff --git a/openslides/motions/static/js/motions/diff.js b/openslides/motions/static/js/motions/diff.js
index 920ec857a..815ca0bfb 100644
--- a/openslides/motions/static/js/motions/diff.js
+++ b/openslides/motions/static/js/motions/diff.js
@@ -625,21 +625,30 @@ angular.module('OpenSlidesApp.motions.diff', ['OpenSlidesApp.motions.lineNumberi
          */
         this._normalizeHtmlForDiff = function (html) {
             // Convert all HTML tags to uppercase, but leave the values of attributes unchanged
+            // All attributes and CSS class names  are sorted alphabetically
             html = html.replace(/<(\/?[a-z]*)( [^>]*)?>/ig, function (html, tag, attributes) {
                 var tagNormalized = tag.toUpperCase();
                 if (attributes === undefined) {
                     attributes = "";
                 }
-                attributes = attributes.replace(/( [^"'=]*)(= *((["'])(.*?)\4))?/gi, function (attr, attrName, attrRest, attrRest2, quot, attrValue) {
-                    var attrNormalized = attrName.toUpperCase();
-                    if (attrRest !== undefined) {
-                        if (attrNormalized === ' CLASS') {
-                            attrValue = attrValue.split(' ').sort().join(' ');
+                var attributesList = [],
+                    attributesMatcher = /( [^"'=]*)(= *((["'])(.*?)\4))?/gi,
+                    match;
+                do {
+                    match = attributesMatcher.exec(attributes);
+                    if (match) {
+                        var attrNormalized = match[1].toUpperCase(),
+                            attrValue = match[5];
+                        if (match[2] !== undefined) {
+                            if (attrNormalized === ' CLASS') {
+                                attrValue = attrValue.split(' ').sort().join(' ');
+                            }
+                            attrNormalized += "=" + match[4] + attrValue + match[4];
                         }
-                        attrNormalized += "=" + quot + attrValue + quot;
+                        attributesList.push(attrNormalized);
                     }
-                    return attrNormalized;
-                });
+                } while (match);
+                attributes = attributesList.sort().join('');
                 return "<" + tagNormalized + attributes + ">";
             });
 
diff --git a/tests/karma/motions/diff.service.test.js b/tests/karma/motions/diff.service.test.js
index de5e65999..548f1fca8 100644
--- a/tests/karma/motions/diff.service.test.js
+++ b/tests/karma/motions/diff.service.test.js
@@ -5,10 +5,10 @@ describe('linenumbering', function () {
   var diffService, baseHtml1, baseHtmlDom1, baseHtml2, baseHtmlDom2, baseHtml3, baseHtmlDom3,
       brMarkup = function (no) {
         return '<br class="os-line-break">' +
-            '<span class="line-number-' + no + ' os-line-number" data-line-number="' + no + '" contenteditable="false">&nbsp;</span>';
+            '<span class="line-number-' + no + ' os-line-number" contenteditable="false" data-line-number="' + no + '">&nbsp;</span>';
       },
       noMarkup = function (no) {
-        return '<span class="line-number-' + no + ' os-line-number" data-line-number="' + no + '" contenteditable="false">&nbsp;</span>';
+        return '<span class="line-number-' + no + ' os-line-number" contenteditable="false" data-line-number="' + no + '">&nbsp;</span>';
       };
 
   beforeEach(inject(function (_diffService_, _lineNumberingService_) {
@@ -374,12 +374,12 @@ describe('linenumbering', function () {
       expect(normalized).toBe('The <STRONG>brown</STRONG> fox')
     });
 
-    it('uppercases the names of html attributes, but not the values', function () {
+    it('uppercases the names of html attributes, but not the values, and sort the attributes', function () {
       var unnormalized = 'This is our cool <a href="https://www.openslides.de/">home page</a> - have a look! ' +
           '<input type="checkbox" checked title=\'A title with "s\'>',
           normalized = diffService._normalizeHtmlForDiff(unnormalized);
       expect(normalized).toBe('This is our cool <A HREF="https://www.openslides.de/">home page</A> - have a look! ' +
-          '<INPUT TYPE="checkbox" CHECKED TITLE=\'A title with "s\'>')
+          '<INPUT CHECKED TITLE=\'A title with "s\' TYPE="checkbox">')
     });
 
     it('strips unnecessary spaces', function () {
@@ -569,6 +569,14 @@ describe('linenumbering', function () {
 
       expect(diff).toBe('<p>tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd <del>gubergren </del>bla, no sea takimata sanctus est Lorem ipsum dolor <ins>gubergren </ins>sit amet.</p>');
     });
+
+    it('works with style-tags in spans', function () {
+        var before = '<p class="os-split-before os-split-after"><span class="os-line-number line-number-4" data-line-number="4" contenteditable="false">&nbsp;</span><span style="color: #0000ff;" class="os-split-before os-split-after">sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing </span></p>',
+          after = '<p class="os-split-after os-split-before"><span class="os-split-after os-split-before" style="color: #0000ff;">sanctus est Lorem ipsum dolor sit amet. Test Lorem ipsum dolor sit amet, consetetur sadipscing </span></p>';
+      var diff = diffService.diff(before, after);
+
+      expect(diff).toBe('<p class="os-split-after os-split-before"><span class="line-number-4 os-line-number" contenteditable="false" data-line-number="4">&nbsp;</span><span class="os-split-after os-split-before" style="color: #0000ff;">sanctus est Lorem ipsum dolor sit amet. <ins>Test </ins>Lorem ipsum dolor sit amet, consetetur sadipscing </span></p>');
+    });
   });
 
   describe('ignoring line numbers', function () {