Size=n and optgroup break select boxes in IOS6 webkit browsers (crash)

As of IOS6, webkit browsers (safari,chrome) will crash when you select a value on a select box that contain a size attribute and optgroup elements.<p>To reproduce this bug, have an html page with the following html (and select an option from the box):<p>&#60;select size="2"&#62; &#60;optgroup&#62; &#60;option&#62;Crash Me&#60;/option&#62; &#60;/optgroup&#62; &#60;/select&#62;