Correctly clone dynami CSSStyleSheets (Fix #1370)

niklasvh · Jan 7, 2018 · 4c14894 · 4c14894
1 parent 8788a9f
commit 4c14894
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Showing 2 changed files with 46 additions and 0 deletions.
diff --git a/src/Clone.js b/src/Clone.js
@@ -229,6 +229,15 @@ export class DocumentCloner {
             return tempIframe;
         }
 
+        if (node instanceof HTMLStyleElement && node.sheet && node.sheet.cssRules) {
+            const css = [].slice
+                .call(node.sheet.cssRules, 0)
+                .reduce((css, rule) => css + rule.cssText, '');
+            const style = node.cloneNode(false);
+            style.textContent = css;
+            return style;
+        }
+
         return node.cloneNode(false);
     }
 

diff --git a/tests/reftests/dynamicstyle.html b/tests/reftests/dynamicstyle.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Dynamic style</title>
+    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+    <script type="text/javascript" src="../test.js"></script>
+    <style id="style">
+        @font-face {
+            font-family: 'Roboto';
+            font-style: normal;
+            font-weight: 400;
+            src: local('Roboto'), local('Roboto-Regular'), url(https://fonts.gstatic.com/s/roboto/v18/CWB0XYA8bzo0kSThX0UTuA.woff2) format('woff2');
+            unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2212, U+2215;
+        }
+        body { font-family: "Roboto", serif }
+
+        div {
+            padding: 20px;
+        }
+        .div1 {
+            background: darkgreen;
+            color: white;
+        }
+    </style>
+    <script>
+        document.querySelector('#style').sheet.insertRule(
+            '.div2 { background: darkgreen; color:white; }',
+            document.querySelector('#style').sheet.cssRules.length
+        );
+    </script>
+</head>
+<body>
+<div class="div1">Static styles</div>
+<div class="div2">Dynamic styles</div>
+</body>
+</html>
+