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Automatic update from web-platform-tests[Squad] Generate ::before/::after/::backdrop in style recalc. We used to create these pseudo elements and their computed styles in Element::AttachLayoutTree when building the layout tree. Now we create or dispose these elements from style recalc, that is, UpdatePseudoElement. To make pseudo elements live through a style recalc with a layout tree re-attach we no longer clear the pseudo elements during DetachLayoutTree for performing_reattach=true. We do however need to clear the pseudo elements which do not get a layout object for the re-attach. That is done in AttachLayoutTree for the originating element when the originating element does not generate a layout box. We stop using the pseudo style cache on ComputedStyle for PseudoElements and instead return the ComputedStyle when creating the pseudo element and store it as non-attached style which can later be retrieved when attaching the layout object. An effect of this change is that we can detect transitions on pseudo elements when ancestors display types changes and causes re-attachment. That is issue 836140. ::first-letter may still be generated during layout tree building, and the ::first-letter layout structure may still be updated during style recalc. Bug: 836126, 836140 Change-Id: Iafad705b7a7b988d4c1598e8a126ce0d79c5873d Reviewed-on: https://chromium-review.googlesource.com/1112244 Commit-Queue: Rune Lillesveen <futhark@chromium.org> Reviewed-by: Chris Harrelson <chrishtr@chromium.org> Cr-Commit-Position: refs/heads/master@{#571665} -- wpt-commits: ec35b03ca5e8eec6eb1767a77f0aea13855515a3 wpt-pr: 11634
28 lines
1 KiB
HTML
28 lines
1 KiB
HTML
<!DOCTYPE html>
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<title>CSS Transitions Test: Transition pseudo element with ancestor display change</title>
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<link rel="author" title="Rune Lillesveen" href="mailto:futhark@chromium.org">
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<link rel="help" href="https://drafts.csswg.org/css-transitions/#starting">
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<link rel="help" href="https://drafts.csswg.org/css-transitions/#transition-property-property">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style>
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#inner::before {
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content: "This text should transition from red to green.";
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height: 100px;
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transition: height steps(2, start) 1s;
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}
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.flex #inner::before {
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height: 300px;
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}
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.flex { display: flex }
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</style>
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<div id="outer">
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<div id="inner"></div>
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</div>
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<script>
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test(() => {
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assert_equals(getComputedStyle(inner, "::before").height, "100px");
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outer.className = "flex";
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assert_equals(getComputedStyle(inner, "::before").height, "200px");
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}, "Check that transitions run on a pseudo element whose ancestor changes display type.");
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</script>
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