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chromium/third_party/blink/web_tests/virtual/forced-high-contrast-colors/fast/css/forced-colors-mode/forced-colors-mode-32.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Forced colors mode - webkit-tap-highlight-color with sys color.</title>
<link rel="help" href="https://www.w3.org/TR/css-color-adjust-1/#forced-colors-properties">
<script src="../../../../../compositing/gestures/resources/link-highlight-helper.js"></script>
<style>
  a {
    text-decoration: none;
    -webkit-tap-highlight-color: GrayText;
  }
</style>
<body onload="runTest();"></body>
  <a href="https://www.wikipedia.org" id="link">
    In forced colors mode, the used value for -webkit-tap-highlight-color
    should remain GrayText.
  </a>
  <script>
    function runTest() {
        useMockHighlight();

        var clientRect = document.getElementById('link').getBoundingClientRect();
        x = (clientRect.left + clientRect.right) / 2;
        y = (clientRect.top + clientRect.bottom) / 2;
        if (window.testRunner)
            testRunner.waitUntilDone();

        if (window.eventSender) {
            eventSender.gestureShowPress(x, y);
            requestAnimationFrame(function() { testRunner.notifyDone(); });
        } else {
            debug("This test requires DumpRenderTree.");
        }
      }
    </script>
</body>