<!-- quirks, intentionally -->
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div class="mixedCase"></div>
<script>
  test(function() {
    const kLime = "rgb(0, 255, 0)";

    let div = document.querySelector("div");
    assert_not_equals(getComputedStyle(div).color, kLime);
    SpecialPowers.DOMWindowUtils.loadSheetUsingURIString('data:text/css,.mixedCase{color:lime}', 1)
    assert_equals(getComputedStyle(div).color, kLime);
  }, "Invalidation of quirks documents when standard sheets are inserted works properly")
</script>
