host-descendant-invalidation.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-scoping/host-descendant-invalidation.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>CSS Test: element style is correctly updated for rule with :host</title>

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

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

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

<link rel="help" href="https://drafts.csswg.org/css-scoping/#host-selector">

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

<script>

test(function() {

  let root = host.attachShadow({ mode: "open" });

  root.innerHTML = `

    <style>

      :host ::slotted(div) { width: 100px; height: 100px; background: red; }

      :host ::slotted(.foo) { background: green; }

    </style>

    <slot></slot>

`;

  assert_equals(getComputedStyle(slotted).backgroundColor, "rgb(255, 0, 0)");

  host.firstElementChild.classList.add('foo');

  assert_equals(getComputedStyle(slotted).backgroundColor, "rgb(0, 128, 0)");

});

</script>