chromium/third_party/blink/manual_tests/word-spacing-highlight.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Highlighting with word spacing</title>
</head>
<body>
<p style="word-spacing:5em;">
M xylophone
</p>
<p style="margin-left:1em;">
&#x2191; click there and drag to the right
</p>
</body>
</html>