Facebook like box widget not recognizing data-width attribute?

Question

I just noticed today that the data-width attribute for the Facebook Like Box widget does not appear to be working. It looks like it is reverting to the default width. An example

Answer 1

Expanding on user2477225's answer, it might have problems with custom positioning that you set (relative or absolute somewhere on the page), so what I did was:

.fb_iframe_widget>span { width: 240px !important; }
.fb-like-box iframe { width: 240px !important; }

Seems to be working so far.

Edit: For IE 8 (and lower), please use this instead:

.fb_iframe_widget span { width: 240px !important; }
.fb-like-box iframe { width: 240px !important; }

I like to be as specific as possible in my selectors, but after checking this issue some more, I see no technical reason to use the > selector here.