mix-blend-mode-only-on-transition.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-view-transitions/mix-blend-mode-only-on-transition.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<title>view-transitions: Blend modes are set up only in paired transitions</title>

<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">

<link rel="author" href="mailto:vmpstr@chromium.org">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<style>

div {

  width: 100px;

  height: 100px;

  background: blue;

  contain: paint;

.tagone { view-transition-name: one }

.tagtwo { view-transition-name: two }

.tagthree { view-transition-name: three }

.tagfour { view-transition-name: four }

.tagfive { view-transition-name: five }

::view-transition-old(four) {

  animation-name: unset;

::view-transition-new(five) {

  animation-name: unset;

</style>

<div id=first class=tagone></div>

<div id=second></div>

<div class=tagthree></div>

<div class=tagfour></div>

<div class=tagfive></div>

<script>

async_test(t => {

  assert_implements(document.startViewTransition, "Missing document.startViewTransition");

  let transition = document.startViewTransition(() => {

    first.classList.toggle("tagone");

    second.classList.toggle("tagtwo");

    requestAnimationFrame(() => {

      requestAnimationFrame(() => {

        t.step(() => assert_equals(getComputedStyle(document.documentElement, "::view-transition-image-pair(one)").isolation, "auto"));

        t.step(() => assert_equals(getComputedStyle(document.documentElement, "::view-transition-old(one)").mixBlendMode, "normal"));

        t.step(() => assert_equals(getComputedStyle(document.documentElement, "::view-transition-image-pair(two)").isolation, "auto"));

        t.step(() => assert_equals(getComputedStyle(document.documentElement, "::view-transition-new(two)").mixBlendMode, "normal"));

        t.step(() => assert_equals(getComputedStyle(document.documentElement, "::view-transition-image-pair(three)").isolation, "isolate"));

        t.step(() => assert_equals(getComputedStyle(document.documentElement, "::view-transition-old(three)").mixBlendMode, "plus-lighter"));

        t.step(() => assert_equals(getComputedStyle(document.documentElement, "::view-transition-new(three)").mixBlendMode, "plus-lighter"));

        t.step(() => assert_equals(getComputedStyle(document.documentElement, "::view-transition-image-pair(four)").isolation, "isolate"));

        t.step(() => assert_equals(getComputedStyle(document.documentElement, "::view-transition-old(four)").mixBlendMode, "normal"));

        t.step(() => assert_equals(getComputedStyle(document.documentElement, "::view-transition-new(four)").mixBlendMode, "plus-lighter"));

        t.step(() => assert_equals(getComputedStyle(document.documentElement, "::view-transition-image-pair(five)").isolation, "isolate"));

        t.step(() => assert_equals(getComputedStyle(document.documentElement, "::view-transition-old(five)").mixBlendMode, "plus-lighter"));

        t.step(() => assert_equals(getComputedStyle(document.documentElement, "::view-transition-new(five)").mixBlendMode, "normal"));

        t.done();

});

});

});

}, "Blend modes are set up on paired transitions");

</script>