style-change-in-container.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-conditional/container-queries/style-change-in-container.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>CSS Container Queries Test: recompute style inside a @container</title>

<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-queries">

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

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

<script src="support/cq-testcommon.js"></script>

<style>

  #container { container-type: size; }

  @container (min-width: 1px) {

    #content { color: green; }

</style>

<div id="container">

  <div id="content"></div>

</div>

<script>

  setup(() => assert_implements_size_container_queries());

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

  test(() => {

    assert_equals(getComputedStyle(content).color, "rgb(0, 128, 0)");

    // Dirty style of an element inside the container:

    content.style.backgroundColor = "lime";

    // The container query should still evaluate correctly:

    assert_equals(getComputedStyle(content).color, 'rgb(0, 128, 0)');

  }, "Basic test for container query evaluation stability");

</script>