File: starting-style-adjustment.html

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<!DOCTYPE html>
<title>CSS Transitions Test: Style adjustments for @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>
<script src="/css/css-transitions/support/helper.js"></script>
<style>
legend {
  transition: display 1s step-end allow-discrete;
}
@starting-style {
  legend { display:inline; }
}
</style>
<body>
<legend></legend>
<script>
promise_test(async t => {
  await waitForAnimationFrames(1);
  assert_equals(document.getAnimations().length, 0, "No transitions");
}, "The display property in <legend> @starting-style should be blockified so no transition should start");
</script>
</body>