OffscreenCanvas-ctx-font-sibling-index-invalid.tentative.html

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/OffscreenCanvas-ctx-font-sibling-index-invalid.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>OffscreenCanvas ctx.font should ignore element-dependent calc and preserve previous value</title>

<link rel="help" href="https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-font">

<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/10982">

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

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

<script>

test(() => {

  var offscreen = new OffscreenCanvas(64, 64);

  var ctx = offscreen.getContext('2d');

  ctx.font = "17px Arial";

  var before = ctx.font;

  ctx.font = "calc(10px * sibling-index()) serif";

  assert_equals(ctx.font, before);

}, 'OffscreenCanvas ctx.font should ignore element-dependent calc and preserve previous value');

</script>