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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-transitions/starting-style-rule-none.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>CSS Transitions Test: No transition if @starting-style display value is none</title>
<link rel="help" href="https://drafts.csswg.org/css-transitions-2/#defining-before-change-style-the-starting-style-rule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/css-transitions/support/helper.js"></script>
<div id="target"></div>
<style>
#target {
transition-property: background-color;
transition-duration: 100s;
transition-timing-function: steps(2, start);
background-color: green;
}
@starting-style {
#target {
display: none;
background-color: red;
}
}
</style>
<script>
setup(() => {
assert_true(supportsStartingStyle(), "Prerequisite: @starting-style parses");
});
promise_test(async t => {
await waitForAnimationFrames(2);
assert_equals(getComputedStyle(target).backgroundColor, "rgb(0, 128, 0)",
"No transition of background-color when @starting-style display is 'none'");
}, "@starting-style with display:none");
</script>