Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/external/wpt/css/css-shadow-parts/part-nested-pseudo.html 

<!doctype html>
<title>::part() doesn't incorrectly match pseudo-elements of the part</title>
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=978105">
<link rel="help" href="https://drafts.csswg.org/css-shadow-parts/">
<link rel="match" href="part-nested-pseudo-ref.html">
<style>
#host::part(input) {
  border: 1px solid green;
}
</style>
<div id="host"></div>
<script>
  document.getElementById("host").attachShadow({ mode: "open" }).innerHTML = `
    <input type=file part=input>
    <input type=text part=input placeholder=Foobar>
  `;
</script>