Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
The :-moz-broken
CSS pseudo-class is a Mozilla extension that matches elements representing broken image links.
Note: This selector is mainly intended to be used by theme developers.
Syntax
:-moz-broken
Example
HTML
<img src="broken.jpg" alt="This image is broken. :-(">
CSS
:-moz-broken { background: bisque; padding: 8px; }