testing/web-platform/tests/css/css-scoping/shadow-directionality-002.tentative.html


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<!doctype html>
<title>CSS Test: directionality propagation in Shadow DOM, appending a shadow host.</title>
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel="help" href="https://html.spec.whatwg.org/#the-dir-attribute">
<link rel="help" href="https://github.com/whatwg/html/issues/3699">
<link rel="match" href="reference/green-box.html">
<p>Test passes if you see a single 100px by 100px green box below.</p>
<style>
  div { width: 100px; }
</style>
<div id="host-parent" dir="rtl"></div>
<script>
  let host = document.createElement("div");
  host.attachShadow({ mode: "open" }).innerHTML = `
    <style>:dir(rtl) { background: green; height: 100px; width: 100px; }</style>
    <div></div>
  `;
  document.getElementById("host-parent").appendChild(host);
</script>