| <!DOCTYPE html> |
| <title>adoptedStyleSheet - Add and remove the same sheet with modifications</title> |
| <link rel="help" href="https://drafts.csswg.org/cssom/#extensions-to-the-document-or-shadow-root-interface"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <div id="target">This text should be green</div> |
| <script> |
| const sheet_a = new CSSStyleSheet(); |
| sheet_a.replaceSync("#target { color: red; }"); |
| const sheet_b = new CSSStyleSheet(); |
| sheet_b.replaceSync("#target {}"); |
| |
| test(() => { |
| document.adoptedStyleSheets = [sheet_a, sheet_b]; |
| assert_equals(getComputedStyle(target).color, "rgb(255, 0, 0)"); |
| }, "Add the two sheets. Text should be red."); |
| |
| test(() => { |
| document.adoptedStyleSheets[1] = sheet_a; |
| document.adoptedStyleSheets[0] = sheet_b; |
| assert_equals(getComputedStyle(target).color, "rgb(255, 0, 0)"); |
| }, "Flip the two sheet. Still red."); |
| |
| test(() => { |
| sheet_a.cssRules[0].style.color = "green"; |
| assert_equals(getComputedStyle(target).color, "rgb(0, 128, 0)"); |
| }, "Modify the color declaration. Should now be green."); |
| </script> |
