css/css-pseudo/hover-on-pseudo-elements.tentative.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test: :hover on ::after, ::before, and ::marker pseudo-elements</title>
<link rel="help" href="https://drafts.csswg.org/css-pseudo/#CSSPseudoElement-interface">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<style>
  div::after {
    content: "after";
    color: blue;
  }

  div::after:hover {
    color: red;
  }

  div::before {
    content: "before";
    color: green;
  }

  div::before:hover {
    color: yellow;
  }

  li::marker {
    color: purple;
  }

  li::marker:hover {
    color: orange;
  }
</style>
<div id="after-target">Test after</div>
<div id="before-target">Test before</div>
<ul>
  <li id="marker-target">Test marker</li>
</ul>
<script>
  const afterTarget = document.getElementById("after-target");
  const beforeTarget = document.getElementById("before-target");
  const markerTarget = document.getElementById("marker-target");

  promise_test(async t => {
    const afterPseudo = afterTarget.pseudo("::after");
    const beforePseudo = beforeTarget.pseudo("::before");
    const markerPseudo = markerTarget.pseudo("::marker");

    // Initial colors
    assert_equals(window.getComputedStyle(afterPseudo.element, afterPseudo.type).color, "rgb(0, 0, 255)", "::after initial color");
    assert_equals(window.getComputedStyle(beforePseudo.element, beforePseudo.type).color, "rgb(0, 128, 0)", "::before initial color");
    assert_equals(window.getComputedStyle(markerPseudo.element, markerPseudo.type).color, "rgb(128, 0, 128)", "::marker initial color");

    // Hover over ::after
    const afterQuads = afterPseudo.getBoxQuads();
    const afterRect = afterQuads[0].getBounds();
    const afterX = afterRect.x + afterRect.width / 2;
    const afterY = afterRect.y + afterRect.height / 2;
    await new test_driver.Actions()
      .pointerMove(afterX, afterY)
      .send();
    assert_equals(window.getComputedStyle(afterPseudo.element, afterPseudo.type).color, "rgb(255, 0, 0)", "::after hover color");

    // Hover over ::before
    const beforeQuads = beforePseudo.getBoxQuads();
    const beforeRect = beforeQuads[0].getBounds();
    const beforeX = beforeRect.x + beforeRect.width / 2;
    const beforeY = beforeRect.y + beforeRect.height / 2;
    await new test_driver.Actions()
      .pointerMove(beforeX, beforeY)
      .send();
    assert_equals(window.getComputedStyle(beforePseudo.element, beforePseudo.type).color, "rgb(255, 255, 0)", "::before hover color");

    // Hover over ::marker
    const markerQuads = markerPseudo.getBoxQuads();
    const markerRect = markerQuads[0].getBounds();
    const markerX = markerRect.x + markerRect.width / 2;
    const markerY = markerRect.y + markerRect.height / 2;
    await new test_driver.Actions()
      .pointerMove(markerX, markerY)
      .send();
    assert_equals(window.getComputedStyle(markerPseudo.element, markerPseudo.type).color, "rgb(255, 165, 0)", "::marker hover color");

    // Move away
    await new test_driver.Actions()
      .pointerMove(0, 0)
      .send();
    assert_equals(window.getComputedStyle(afterPseudo.element, afterPseudo.type).color, "rgb(0, 0, 255)", "::after back to initial");
    assert_equals(window.getComputedStyle(beforePseudo.element, beforePseudo.type).color, "rgb(0, 128, 0)", "::before back to initial");
    assert_equals(window.getComputedStyle(markerPseudo.element, markerPseudo.type).color, "rgb(128, 0, 128)", "::marker back to initial");
  });
</script>