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66 lines
2.6 KiB
HTML
66 lines
2.6 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>CSS Variables - Transitions - From value to no value</title>
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<meta rel="author" title="Kevin Babbitt">
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<meta rel="author" title="Greg Whitworth">
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<link rel="author" title="Microsoft Corporation" href="http://microsoft.com" />
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<link rel="help" href="http://www.w3.org/TR/css-variables-1/#syntax">
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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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#target
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{
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transition-property: --value;
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transition-duration: 1s;
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}
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#target
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{
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color: var(--value);
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}
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</style>
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</head>
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<body>
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<div id="target" style="--value: green">This text should transition from green to black over a period of 1 second.</div>
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<script type="text/javascript">
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"use strict";
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// Force an initial layout pass
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document.documentElement.offsetHeight;
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test(function() {
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assert_equals(window.getComputedStyle(document.getElementById("target")).getPropertyValue("--value").trim(), "green", "--value is green before transition runs");
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}, "Verify CSS variable value before transition");
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test(function() {
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// Different browsers generate interpolated colors differently, so check multiple valid forms.
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assert_in_array(window.getComputedStyle(document.getElementById("target")).getPropertyValue("color").trim(),
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["rgb(0, 128, 0)", "rgba(0, 128, 0, 1)"],
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"color is green before transition runs");
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}, "Verify substituted color value before transition");
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var afterAnimationVariableTest = async_test("Verify CSS variable value after transition");
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document.getElementById("target").addEventListener("transitionend", afterAnimationVariableTest.step_func_done(function() {
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assert_equals(window.getComputedStyle(document.getElementById("target")).getPropertyValue("--value").trim(), "", "--value has no value after transition runs")
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}));
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var afterAnimationColorTest = async_test("Verify substituted color value after transition");
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document.getElementById("target").addEventListener("transitionend", afterAnimationColorTest.step_func_done(function() {
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assert_in_array(window.getComputedStyle(document.getElementById("target")).getPropertyValue("color").trim(),
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["rgb(0, 0, 0)", "rgba(0, 0, 0, 1)"],
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"color is black after transition runs")
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}));
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// Trigger transition
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document.getElementById("target").removeAttribute("style");
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// Force another layout pass
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document.documentElement.offsetHeight;
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</script>
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</body>
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</html>
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