LayoutTests/fast/repaint/rtl-content-selection-hairline-gap.html

<meta http-equiv="Content-Type" content="text/html;charset=utf-8" >
<style>
div {
  font-family: sans-serif;
  font-size: 40px;
}
</style>
<div id=select_this lang="ja"><span>ンズ</span>pass if no hairline gap after select</div>
<script src="../../resources/ui-helper.js"></script>
<script>
if (window.testRunner) {
  testRunner.dumpAsText();
  testRunner.waitUntilDone();
}

async function repaintTest() {
  if (window.internals)
    internals.startTrackingRepaints();

  let range = document.createRange();
  range.selectNodeContents(select_this);  
  window.getSelection().addRange(range);

  await UIHelper.renderingUpdate();
 
  if (window.internals) {
    var repaintRects = internals.repaintRectsAsText();
    internals.stopTrackingRepaints();
    var pre = document.createElement('pre');
    document.body.appendChild(pre);
    pre.innerText = repaintRects.indexOf("88 17 694 41") != -1 ? "PASS" : "FAIL";
  }

  if (window.testRunner)
    testRunner.notifyDone();
}
setTimeout(repaintTest, 0);

</script>