File: style-query-registered-custom-rem-change.html

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<!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>