File: parent-style-relative-units.html

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<!DOCTYPE html>
<title>Canvas test: CanvasTextDrawingStyles.font with canvas relative units</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-font">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<canvas id="canvas" style="font-size: 30px; line-height: 40px"></canvas>
<script>
  const canvas = document.getElementById("canvas");
  const ctx = canvas.getContext("2d");

  test(() => {
    ctx.font = "2em serif";
    assert_equals(ctx.font, "60px serif");
  }, "Font-size based on canvas element font-size");

  test(() => {
    // Line-height should be forced to normal, but also irrelevant for resolving
    // lh-units for font-size.
    ctx.font = "2lh/100 serif";
    assert_equals(ctx.font, "80px serif");
  }, "Font-size based on canvas element line-height");
</script>