style-query-registered-custom-rem-change.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-conditional/container-queries/style-query-registered-custom-rem-change.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>CSS Container Queries Test: style() query with rem unit for registered custom property</title>

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

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

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

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

<style>

  @property --length {

    syntax: "<length>";

    initial-value: 0px;

    inherits: false;

  :root, body { font-size: 16px; }

  #container { --length: 100px; }

  #target { color: red; }

  @container style(--length: calc(1rem * 10)) {

    #target { color: green; }

</style>

<div id="container">

  <div id="target">Should be green</div>

</div>

<script>

  test(() => {

    assert_equals(getComputedStyle(target).color, "rgb(255, 0, 0)");

  }, "Initially, 1rem * 10 evaluates to 160px");

  test(() => {

    document.documentElement.style.fontSize = "10px";

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

  }, "Changing the :root font-size to 10px makes 1rem * 10 evaluate to 100px");

</script>