<html><head></head><body>
1, 3, and 4 should all show the same red square. 2 should show nothing.
<ol>
<li><canvas style="background-color:red;" width="100" height="100"></canvas></li>
<li><canvas width="100" height="100"></li>
<li><canvas style="background-color:red;" width="100" height="100"></li>
<li><canvas style="background-color:red;" width="100" height="100"></li>
</ol>
</body></html>