What is this hack called?

[liunx]

Hello all. I know what the following hack is doing but just wondered the name of the hack:

#container {
padding:0 10px;
width:150px;
\width:170px;
w\idth:150px;
}

Thanks,
RSimplified box model hack (<!-- m --><a class="postlink" href="http://www.dithered.com/css_filters/css_only/simplified_box_model.html">http://www.dithered.com/css_filters/css ... model.html</a><!-- m -->)Much appreciated Fang.