content-visibility-036.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-contain/content-visibility/content-visibility-036.html - WPT Dashboard Interop Dashboard

<!doctype HTML>

<html>

<meta charset="utf8">

<title>Display Locking: style on hidden element & child</title>

<link rel="author" title="Rakina Zata Amni" href="mailto:rakina@chromium.org">

<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">

<meta name="assert" content="style is available for content-visibility hidden elements">

<style>

.hidden {

  content-visibility: hidden;

</style>

<div id="container" class=hidden>

  <div id="child">

    <div id="grandchild"></div>

  </div>

</div>

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

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

<script>

async_test((t) => {

  async function runTest() {

    let container = document.getElementById("container");

    container.style = "color: blue;";

    t.step(() => assert_equals(getComputedStyle(container).color, "rgb(0, 0, 255)", "container color changed to blue"));

    t.step(() => assert_equals(getComputedStyle(child).color, "rgb(0, 0, 255)", "child inherits blue color"));

    t.step(() => assert_equals(getComputedStyle(grandchild).color, "rgb(0, 0, 255)", "grandchild inherits blue color"));

    child.style = "color: green;";

    t.step(() => assert_equals(getComputedStyle(container).color, "rgb(0, 0, 255)", "container color is still blue"));

    t.step(() => assert_equals(getComputedStyle(child).color, "rgb(0, 128, 0)", "child color changed to green"));

    t.step(() => assert_equals(getComputedStyle(grandchild).color, "rgb(0, 128, 0)", "grandchild inherits green color"));

    child.style = "";

    // Commit container, lock child.

    container.classList.remove("hidden");

    child.classList.add("hidden");

    requestAnimationFrame(() => {

      // Update style outside of the hidden subtree.

      container.style = "color: red;";

      container.offsetTop;

      // Inheritance works as usual through hidden boundaries.

      t.step(() => assert_equals(getComputedStyle(grandchild).color, "rgb(255, 0, 0)", "grandchild inherits red color"));

      t.step(() => assert_equals(getComputedStyle(child).color, "rgb(255, 0, 0)", "child inherits red color"));

      t.step(() => assert_equals(getComputedStyle(container).color, "rgb(255, 0, 0)", "container color changed to red"));

      t.done();

});

  window.onload = function() {

    requestAnimationFrame(() => requestAnimationFrame(runTest));

};

}, "getComputedStyle gets up-to-date style");

</script>