| <!doctype HTML> |
| <html> |
| <meta charset="utf8"> |
| <title>Display Locking: style on hidden element & child</title> |
| <link rel="author" title="Rakina Zata Amni" href="mailto:rakina@chromium.org"> |
| <link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility"> |
| <meta name="assert" content="style is available for content-visibility hidden elements"> |
| |
| <style> |
| .hidden { |
| content-visibility: hidden; |
| } |
| </style> |
| <div id="container" class=hidden> |
| <div id="child"> |
| <div id="grandchild"></div> |
| </div> |
| </div> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| |
| <script> |
| async_test((t) => { |
| async function runTest() { |
| let container = document.getElementById("container"); |
| container.style = "color: blue;"; |
| t.step(() => assert_equals(getComputedStyle(container).color, "rgb(0, 0, 255)", "container color changed to blue")); |
| t.step(() => assert_equals(getComputedStyle(child).color, "rgb(0, 0, 255)", "child inherits blue color")); |
| t.step(() => assert_equals(getComputedStyle(grandchild).color, "rgb(0, 0, 255)", "grandchild inherits blue color")); |
| |
| child.style = "color: green;"; |
| t.step(() => assert_equals(getComputedStyle(container).color, "rgb(0, 0, 255)", "container color is still blue")); |
| t.step(() => assert_equals(getComputedStyle(child).color, "rgb(0, 128, 0)", "child color changed to green")); |
| t.step(() => assert_equals(getComputedStyle(grandchild).color, "rgb(0, 128, 0)", "grandchild inherits green color")); |
| |
| child.style = ""; |
| |
| // Commit container, lock child. |
| container.classList.remove("hidden"); |
| child.classList.add("hidden"); |
| requestAnimationFrame(() => { |
| // Update style outside of the hidden subtree. |
| container.style = "color: red;"; |
| container.offsetTop; |
| |
| // Inheritance works as usual through hidden boundaries. |
| t.step(() => assert_equals(getComputedStyle(grandchild).color, "rgb(255, 0, 0)", "grandchild inherits red color")); |
| t.step(() => assert_equals(getComputedStyle(child).color, "rgb(255, 0, 0)", "child inherits red color")); |
| t.step(() => assert_equals(getComputedStyle(container).color, "rgb(255, 0, 0)", "container color changed to red")); |
| |
| t.done(); |
| }); |
| } |
| |
| window.onload = function() { |
| requestAnimationFrame(() => requestAnimationFrame(runTest)); |
| }; |
| }, "getComputedStyle gets up-to-date style"); |
| </script> |
| |
