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b08072ea30
getComputedStyle() ensures triggering new transitions, so we don't need to wait for a requestAnimationFrame callback. MozReview-Commit-ID: Bes1vQeHohI --HG-- extra : rebase_source : fdb8face312a471be5f93229a9fbbfd4fc59418f
45 lines
1.2 KiB
HTML
45 lines
1.2 KiB
HTML
<!DOCTYPE html>
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<html class="reftest-wait">
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<title>
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Opacity transition and animation overridden by !important rule creates a
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stacking context
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</title>
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<style>
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span {
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height: 100px;
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width: 100px;
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position: fixed;
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background: green;
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top: 50px;
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}
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@keyframes Opacity0 {
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from, to { opacity: 0; }
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}
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#test {
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width: 100px; height: 100px;
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background: blue;
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opacity: 0 ! important;
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transition: opacity 100s steps(1, start);
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animation: Opacity0 100s;
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}
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</style>
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<span></span>
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<div id="test"></div>
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<script>
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window.addEventListener("load", () => {
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var target = document.getElementById("test");
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getComputedStyle(target).opacity;
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// Change the opacity style to 100%.
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target.style.setProperty("opacity", "1", "important");
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// Important style is changed but there is a CSS animation,
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// so transition won't be visible and the CSS animation is overridden by
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// the !important rule. As a result opacity style here should be 100%
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// specified by the important rule, but we should create a stacking
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// context for it because there are animations.
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getComputedStyle(target).opacity;
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document.documentElement.classList.remove("reftest-wait");
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});
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</script>
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