Crash IE9 with CSS

A bug was recently discovered in Internet Explorer 9. This browser crashed while opening a page that was nothing special, just a few scripts and CSS.

The experiment showed that such innocent code leads to the fall of the browser.

.questionmark {
border-bottom: 1px dotted #555;
font-size: 12px;
font-weight: bold;
color:#ff2558;
}

')
Most likely, IE9 in some situations does not correctly handle the border-bottom when the dotted parameter is specified.

The bug is in the ninth version of the browser, previous versions of IE work fine.