2d.text-outside-of-the-flat-tree.html

<!doctype html>
<meta charset="utf-8">
<title>Canvas outside the flat tree</title>
<link rel="author" href="mailto:[email protected]" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1792860">
<link rel="match" href="2d.text-outside-of-the-flat-tree-ref.html">
<div id="host"><canvas id="canvas"></canvas></div>
<script>
  let host = document.getElementById("host");
  // Leaves the canvas un-slotted.
  let root = host.attachShadow({ mode: "open"});
  let canvas = document.getElementById("canvas");
  let ctx = canvas.getContext("2d");
  ctx.font = "10px sans-serif";
  ctx.fillText('Hello, world', 10, 10);
  // Slots the content.
  root.innerHTML = `<slot></slot>`;
</script>

chromium/third_party/blink/web_tests/external/wpt/html/canvas/element/2d.text-outside-of-the-flat-tree.html