getComputedStyle-display-none-001.html

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This WPT test may be referenced by the following Test IDs:
- /css/cssom/getComputedStyle-display-none-001.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

<title>CSSOM: getComputedStyle gets invalidated for display: none elements (inheritance)</title>

<link rel="help" href="https://drafts.csswg.org/cssom/#dom-window-getcomputedstyle">

<link rel="help" href="https://bugs.webkit.org/show_bug.cgi?id=186882">

<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">

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

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

<style>

#undisplayed, #host {

  display: none;

  color: red;

</style>

<div id="undisplayed"><div id="child"></div></div>

<div id="host"></div>

<script>

  test(function() {

    let undisplayed_style = getComputedStyle(undisplayed);

    let undisplayed_child_style = getComputedStyle(child);

    assert_equals(undisplayed_style.color, "rgb(255, 0, 0)");

    assert_equals(undisplayed_child_style.color, "rgb(255, 0, 0)");

    undisplayed.style.color = "green";

    assert_equals(undisplayed_style.color, "rgb(0, 128, 0)");

    assert_equals(undisplayed_child_style.color, "rgb(0, 128, 0)");

  }, "getComputedStyle gets invalidated in display: none subtrees due to inherited changes to an ancestor");

  test(function() {

    host.attachShadow({ mode: 'open' }).innerHTML = `

      <div></div>

`;

    let host_style = getComputedStyle(host);

    let shadow_style = getComputedStyle(host.shadowRoot.firstElementChild);

    assert_equals(host_style.color, "rgb(255, 0, 0)");

    assert_equals(shadow_style.color, "rgb(255, 0, 0)");

    host.style.color = "green";

    assert_equals(host_style.color, "rgb(0, 128, 0)");

    assert_equals(shadow_style.color, "rgb(0, 128, 0)");

  }, "getComputedStyle gets invalidated in display: none subtrees due to inherited changes to an ancestor shadow host");

</script>