File: bug1893673.html

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<!DOCTYPE HTML>
<html class="reftest-wait">
<script src="/tests/SimpleTest/EventUtils.js"></script>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script>
  function run() {
    const text = document.getElementById("text");
    // Triple click it
    synthesizeMouse(text, 0, 0, {type: "mousedown", clickCount: 3});
    synthesizeMouse(text, 0, 0, {type: "mouseup", clickCount: 3});

    function waitForPaint() {
      return new Promise(r => {
        window.requestAnimationFrame(function () {
          window.requestAnimationFrame(function () {
            r();
          });
        });
      });
    }

    waitForPaint().then(function () {
      // Verify that this layout change doesn't cause the visual blue background
      // of the text selection to disappear.
      text.style["margin-top"] = "100px";
      waitForPaint().then(function () {
        document.documentElement.className = '';
      });
    });
  }
  SimpleTest.waitForFocus(run);
</script>
<body>
  <div>
    <div>
      <span id="text">This is a loonnnnnnnnnnnnnnnnnnnnnnnnnnnng paragraph</span>
    </div>
  </div>
</body>
</html>