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https://github.com/web-platform-tests/wpt
26 December 2018, 22:31:15 UTC
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Tip revision: 42a98283681188744c47f2bba33ad818a5b8d585 authored by Stephen Chenney on 20 December 2018, 17:40:54 UTC
Fix table cell background painting under zoom and min-width
Tip revision: 42a9828
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>
<style id="styleElm">
</style>
<script>
  function parse_selector(selector_text) {
    try {
      styleElm.sheet.insertRule(selector_text+"{}");
      styleElm.sheet.deleteRule(0);
      return true;
    } catch (ex) {
      return false;
    }
  }

  function test_valid_selector(selector_text) {
    test(function(){
      assert_true(parse_selector(selector_text));
    }, "Should be a valid selector: '" + selector_text + "'");
  }

  function test_invalid_selector(selector_text) {
    test(function(){
      assert_false(parse_selector(selector_text));
    }, "Should be an invalid selector: '" + selector_text + "'");
  }

  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(*):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))");

  // Allow tree-abiding pseudo elements after ::slotted
  test_valid_selector("::slotted(*)::before");
  test_valid_selector("::slotted(*)::after");
  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>
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