what is this hack?

[ofir]

here : http://css.maxdesign.com.au/listamatic/vertical18.htm
i found some hacks:
\width: 160px;
w\idth: 158px;

how does it work?

[mikepurvis]

There's a definitive resource here (http://centricle.com/ref/css/filters/):

The particular hack you're referring to is this one:
http://centricle.com/ref/css/filters/tests/sbmh/