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- This WPT test may be referenced by the following Test IDs:
- /css/css-transitions/starting-style-name-defining-rules.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>CSS Transitions Test: Name defining @-rules in @starting-style</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>
<style>
@starting-style {
@keyframes anim {
from { color: green; }
to { color: red; }
}
@font-face {
font-family: web-font;
src: url('/fonts/Ahem.ttf');
}
@layer first;
}
@layer second {
#target.not_start {
background-color: green;
}
}
@layer first {
#target.not_start {
background-color: red;
}
}
#target.not_start {
animation-name: anim;
animation-duration: 60s;
animation-timing-function: step-end;
font-family: web-font;
font-size: 20px;
}
#target {
/* For measuring text width */
display: inline-block;
}
</style>
<span id="target">XXXX</span>
<script>
test(() => {
// Force style update to ensure before-change style is defined.
target.offsetTop;
target.className = "not_start";
let target_style = getComputedStyle(target);
assert_equals(target_style.color, "rgb(0, 128, 0)", "@keyframes applied");
assert_equals(target_style.backgroundColor, "rgb(0, 128, 0)", "@layer applied");
}, "@keyframes and @layer in @starting-style apply");
promise_test(async () => {
await document.fonts.load("20px/1 web-font");
assert_equals(getComputedStyle(target).width, "80px");
}, "Load @font-face from @starting-style rule");
</script>