| <!DOCTYPE html> |
| <script src="../../../resources/testharness.js"></script> |
| <script src="../../../resources/testharnessreport.js"></script> |
| <div id="shadowHost"></div> |
| <style id="style"></style> |
| <script> |
| function moveAndReentrantlyAppendToStyleElement() { |
| let sr = shadowHost.createShadowRoot(); |
| let script = document.createElement('script'); |
| sr.appendChild(script); |
| |
| let scriptText = ` |
| let s = shadowHost.shadowRoot.querySelector('style'); |
| let text = document.createTextNode('div { background-color: skyblue; }'); |
| s.appendChild(text);`; |
| |
| // Appending scriptText and style in the same call is important here. This way |
| // scriptText will be evaluated synchronously while in script.append. |
| // Having that script execute before the tree-scope-move was fully completed |
| // is what caused a crash previously. |
| script.append(scriptText, style); |
| } |
| |
| test(function () { |
| try { |
| moveAndReentrantlyAppendToStyleElement(); |
| } catch (e) {} |
| let bg = shadowHost.shadowRoot.styleSheets[0].cssRules[0].styleMap |
| .get('background-color').toString(); |
| assert_equals(bg, 'skyblue'); // Don't crash. |
| }, 'Reentrantly appending to style element while changing tree scope does not crash'); |
| |
| </script> |
