59 lines
2.4 KiB
HTML
59 lines
2.4 KiB
HTML
<!DOCTYPE html>
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<title>CSS Transitions Test: @starting-style for pseudo elements</title>
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<link rel="help" href="https://drafts.csswg.org/css-transitions-2/#defining-before-change-style-the-starting-style-rule">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="/css/css-transitions/support/helper.js"></script>
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<div id="target" class="trans"></div>
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<style>
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#target::before {
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transition-property: background-color, color;
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transition-duration: 100s;
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transition-timing-function: steps(2, start);
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color: green;
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background-color: white;
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content: "";
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}
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@starting-style {
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#target::before {
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background-color: black;
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}
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}
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#target.red::before {
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background-color: red;
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}
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</style>
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<script>
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promise_test(async t => {
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await waitForAnimationFrames(2);
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assert_equals(getComputedStyle(target, "::before").color, "rgb(0, 128, 0)",
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"No transition of color");
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assert_equals(getComputedStyle(target, "::before").backgroundColor, "rgb(128, 128, 128)",
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"Background transition from @starting-style value black to white");
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}, "Triggered transition from first style update");
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promise_test(async t => {
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target.style.display = "none";
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target.className = "red";
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assert_equals(getComputedStyle(target, "::before").backgroundColor, "rgb(255, 0, 0)",
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"Overridden with red. No transition while display:none");
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target.className = "";
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assert_equals(getComputedStyle(target, "::before").backgroundColor, "rgb(255, 255, 255)",
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"Removing class while display:none. Still no transition");
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await waitForAnimationFrames(2);
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target.style.display = "block";
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await waitForAnimationFrames(2);
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assert_equals(getComputedStyle(target, "::before").backgroundColor, "rgb(128, 128, 128)",
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"Background transition from @starting-style value black to white");
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}, "Triggered transition from display:none to display:block");
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promise_test(async t => {
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let removed = target;
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removed.remove();
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await waitForAnimationFrames(2);
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document.body.appendChild(removed);
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await waitForAnimationFrames(2);
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assert_equals(getComputedStyle(target, "::before").backgroundColor, "rgb(128, 128, 128)",
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"Background transition from @starting-style value black to white");
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}, "Triggered transition on DOM insertion");
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</script>
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