known-properties rule should tolerate star (IE6/7) & underscore (IE6) hacks

[mahonnaise]

.foo {
  margin-top: 10px;
  _margin-top: 15px;
}

Unknown property '_margin-top'.

.bar {
  *zoom: 1;
}

Unknown property '*zoom'.

While that's technically correct, it isn't very helpful. It makes this - otherwise very useful rule - too chatty.

Strictly speaking, it confuses one issue with another. Disallowing star/underscore hacks is a completely different thing. Filter hacks should be handled by dedicated rules. Therefore, the known-properties rule should silently pretend that the property name isn't prefixed with '*' or '_'.

[nzakas]

Yup, you're right. That's a bug.

[sitedyno]

I really don't mind this but... isn't this really better? http://paulirish.com/2008/conditional-stylesheets-vs-css-hacks-answer-neither/

[nzakas]

We're not debating the approach here. The CSS Lint parser does understand hacks, so it should give better messages. Perhaps we should add a rule to disallow star and underscore hacks, but that's not the job of this rule.