css/css-scoping/slotted-parsing.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Scoping: ::slotted pseudo parsing</title>
<link rel="author" title="Rune Lillesveen" href="mailto:rune@opera.com">
<link rel="help" href="https://drafts.csswg.org/css-scoping/#slotted-pseudo">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<style id="styleElm">
</style>
<script>
  test_invalid_selector("::slotted");
  test_invalid_selector("::slotted()");
  test_invalid_selector("::slotted(*).class");
  test_invalid_selector("::slotted(*)#id {}");
  test_invalid_selector("::slotted(*)[attr]");
  test_invalid_selector("::slotted(*):host");
  test_invalid_selector("::slotted(*):host(div)");
  test_invalid_selector("::slotted(*):hover");
  test_invalid_selector("::slotted(*):read-only");
  test_invalid_selector("::slotted(*)::slotted(*)");
  test_invalid_selector("::slotted(*)::before::slotted(*)");
  test_invalid_selector("::slotted(*) span");

  test_valid_selector("::slotted(*)");
  test_valid_selector("::slotted(div)");
  test_valid_selector("::slotted([attr]:hover)");
  test_valid_selector("::slotted(:not(.a))");

  test_valid_forgiving_selector("::slotted(*):is()");
  test_valid_forgiving_selector("::slotted(*):is(:hover)");
  test_valid_forgiving_selector("::slotted(*):is(#id)");

  test_valid_forgiving_selector("::slotted(*):where()");
  test_valid_forgiving_selector("::slotted(*):where(:hover)");
  test_valid_forgiving_selector("::slotted(*):where(#id)");
  test_valid_forgiving_selector("::slotted(*):where(::before)");

  // Allow tree-abiding pseudo elements after ::slotted
  test_valid_selector("::slotted(*)::before");
  test_valid_selector("::slotted(*)::after");
  test_valid_selector("::slotted(*)::details-content");
  test_valid_selector("::slotted(*)::file-selector-button");
  test_valid_selector("::slotted(*)::placeholder");
  test_valid_selector("::slotted(*)::marker");

  // Other pseudo elements not valid after ::slotted
  test_invalid_selector("::slotted(*)::first-line");
  test_invalid_selector("::slotted(*)::first-letter");
  test_invalid_selector("::slotted(*)::selection");
</script>