Is ".ad-space" a reserved class in webkit?

Take a look at this, I'm using 960.gs here and couldn't figure out why my ads class named ".ad-space" was disappearing in webkit. Seems to work in Firefox, but not in Chrome or Safari. Is it an addon bug in webkit? Maybe Adblock Plus? Anyone else notice the b开发者_高级运维ottom one isn't there? It doesn't seem to happen in local development, but when http:// is used it disappears.

It's Adblock plus interference. Moral of the story: don't name your ad's class "ad-space"