zero-duration-multiple-transition.html

<!doctype html>
<meta charset="utf-8">
<link rel="help" href="https://drafts.csswg.org/css-transitions/#starting">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1461070">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  #t {
    color: red;
    transition-property: color, color;
    transition-duration: 1s, 0s;
  }
</style>
<div id="t"></div>
<script>
test(function() {
  let div = document.getElementById("t");
  assert_equals(getComputedStyle(div).color, "rgb(255, 0, 0)");

  div.style.color = "green";
  assert_equals(
    div.getAnimations().length,
    0,
    "No transition should've started"
  );

  assert_equals(getComputedStyle(div).color, "rgb(0, 128, 0)");
}, "transition-duration of 0 prevents earlier transitions with the same property from starting.");
</script>

chromium/third_party/blink/web_tests/external/wpt/css/css-transitions/zero-duration-multiple-transition.html