chromium/third_party/blink/manual_tests/context-click-generated-content.html

<style type="text/css">
html:before, html:after {
	content: "";
	width: 50px;
	height: 50px;
	position: fixed;
}
html:before {
	border: solid red 5px;
}
html:after {
	border: solid green 5px;
	top: 60px;
}
</style>

<p>
Test of crash when context-clicking on generated content.
Do a control-click or a right-click in one of these two
boxes, and make sure you don't see a crash.
</p>