Fixing how styles are added to SVG documents to please IE

This also allowed the SVG element to be created in a single place

src/index.html

@@ -26,10 +26,7 @@
 
   <ul id="warnings"></ul>
 
-  <!-- NOTE: Do not put anything in #regexp-render other than the <svg> element -->
-  <div id="regexp-render">
-    <svg xmlns="http://www.w3.org/2000/svg" version="1.1"></svg>
-  </div>
+  <div id="regexp-render"></div>
 </div>
 
 <script src="/js/main.js" async defer></script>

src/js/main.js

@@ -20,7 +20,7 @@ import _ from 'lodash';
 
     element.className = _.compact([element.className, 'loading']).join(' ');
     element.innerHTML = [
-      '<svg xmlns="http://www.w3.org/2000/svg" version="1.1"></svg>',
+      '<div class="svg"></div>',
       '<div class="spinner">',
         '<div></div>',
         '<div></div>',
@@ -28,7 +28,7 @@ import _ from 'lodash';
       element.innerHTML
     ].join('');
 
-    svg = element.querySelector('svg');
+    svg = element.querySelector('.svg');
 
     setTimeout(() => {
       parser.parse(element.getAttribute('data-expr'))

src/js/parser/javascript.js

@@ -32,16 +32,22 @@ export default class Parser {
     return deferred.promise;
   }
 
-  render(svgElement, styles) {
-    var svg;
+  render(containerElement, styles) {
+    var svg,
+        style = document.createElement('style');
 
-    svgElement.innerHTML = [
-      '<style type="text/css">',
-      styles,
-      '</style>'
-    ].join('');
+    containerElement.innerHTML = '<svg xmlns="http://www.w3.org/2000/svg" version="1.1"></svg>';
 
-    svg = Snap(svgElement);
+    svg = Snap(containerElement.querySelector('svg'));
+
+    style.setAttribute('type', 'text/css');
+    if (style.styleSheet) {
+      style.styleSheet.cssText = styles;
+    } else {
+      style.appendChild(document.createTextNode(styles));
+    }
+
+    svg.select('defs').append(style);
 
     return this.parsed.render(svg.group())
       .then(result => {

src/js/regexper.js

@@ -13,7 +13,7 @@ export default class Regexper {
     this.permalink = root.querySelector('a[data-glyph="link-intact"]');
     this.download = root.querySelector('a[data-glyph="data-transfer-download"]');
     this.percentage = root.querySelector('#progress div');
-    this.svg = root.querySelector('#regexp-render svg');
+    this.svgContainer = root.querySelector('#regexp-render');
     this.svgStyles = this.root.querySelector('#svg-styles').innerHTML;
 
     this.gaq = (typeof window._gaq === 'undefined') ? [] : window._gaq;
@@ -108,7 +108,7 @@ export default class Regexper {
   updateLinks() {
     try {
       this.download.parentNode.style.display = null;
-      this.download.href = this.buildBlobURL(this.svg.parentNode.innerHTML);
+      this.download.href = this.buildBlobURL(this.svgContainer.innerHTML);
     }
     catch(e) {
       // Blobs or URLs created from them don't work here.
@@ -158,7 +158,7 @@ export default class Regexper {
 
         throw message;
       })
-      .invoke('render', this.svg, this.svgStyles)
+      .invoke('render', this.svgContainer, this.svgStyles)
       .then(() => {
         this.state = 'has-results';
         this.updateLinks();

src/sass/main.scss

@@ -264,12 +264,17 @@ header {
           margin-left: -24px;
         }
 
-        svg {
+        .svg {
           position: absolute;
           top: -10000px;
         }
       }
 
+      .svg {
+        margin: 0;
+        text-align: center;
+      }
+
       figcaption {
         @include adjust-font-size-to($base-font-size);
         background: $green;