chromium/third_party/blink/web_tests/external/wpt/css/css-cascade/scope-visited-ref.html

<!DOCTYPE html>
<title>@scope - :visited</title>
<link rel="help" href="https://drafts.csswg.org/css-cascade-6/#scoped-styles">
<link rel="help" href="https://drafts.csswg.org/selectors-4/#link">

<style>
    /* The visited background-color magically gets the alpha of the
     unvisited color, which by default is rgba(0, 0, 0, 0). Set alpha to
     255 so that visited colors also gets this alpha. */
  * { background-color: rgba(255, 255, 255, 255); }
</style>

<!-- :visited via :scope in subject -->
<div>
  <a id=visited href="" style="background-color:coral">
    Visited <span>Span</span>
  </a>
</div>

<!-- :link via :scope in subject -->
<div>
  <a id=unvisited href="x" style="background-color:skyblue">
    Unvisited <span>Span</span>
  </a>
</div>

<!-- :visited via :scope in non-subject -->
<div>
  <a id=visited href="">
    Visited <span style="background-color:coral">Span</span>
  </a>
</div>

<!-- :link via :scope in non-subject -->
<div>
  <a id=unvisited href="x">
    Unvisited <span style="background-color:skyblue">Span</span>
  </a>
</div>

<!-- :visited in scope-end -->
<div>
  <main>
    Main
    <a id=visited href="">
      Visited <span>Span</span>
    </a>
  </main>
</div>

<!-- :visited in scope-end, unvisited link -->
<div>
  <main>
    Main
    <a id=unvisited href="x" style="background-color:skyblue">
      Unvisited <span>Span</span>
    </a>
  </main>
</div>

<!-- :link in scope-end -->
<div>
  <main>
    Main
    <a id=unvisited href="x">
      Unvisited <span>Span</span>
    </a>
  </main>
</div>

<!-- :link in scope-end, visited link -->
<div>
  <main>
    Main
    <a id=visited href="" style="background-color:coral">
      Visited <span>Span</span>
    </a>
  </main>
</div>

<!-- :link in scope-end, visited link -->
<div>
  <main>
    Main
    <a id=outer_visited href="">
      Visited1
    </a>
  </main>
</div>
<script>
  // Insert inner <a> with JS, since the parser can't produce this result.
  let inner_a = document.createElement('a');
  inner_a.setAttribute('href', '');
  inner_a.textContent = 'Visited2';
  outer_visited.append(inner_a);
</script>