chromium/third_party/blink/renderer/core/testing/data/double_press_selection.html

<!DOCTYPE html>
<html>
<head>
</head>
<body>
<div id='targetdiv' style='font-size:500%;width:50px;'>
<p id='target' contenteditable>
Test selection
</p>
<p id="onselectstartfalse" onselectstart="return false;" contenteditable>
Test selection
</p>
</div>
</body>
</html>