<!doctype html>
<script src="../../resources/run-after-layout-and-paint.js"></script>
<style>
body {
  font-size: 48px;
}
</style>
<div style="display:inline-block">x</div>y
<script>
runAfterLayoutAndPaint(function() {
  document.execCommand("SelectAll", false);
}, true);
</script>