starting-style-rule-none.html

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This test has a WPT meta file that expects 1 subtest issues.
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>