I contacted the support of a mayor IDE, after the CSS property `position` didn't "auto-complete" in the latest version. They said it doesn't exist in CSS 3. I did some digging, and replied

> 
> "CSS Level 3 builds on CSS Level 2 module by module, using the CSS2.1
>  specification as its core. Each module adds functionality and/or
>  replaces part of the CSS2.1 specification."
>  <http://www.w3.org/TR/2011/NOTE-css-2010-20110512/#css3>
> 
> 
> Additionally, this defines the position property, although it's not
>  finished: <http://www.w3.org/Style/CSS/specs#positioning>
> 
> 
> 

But they stood their ground. This is a reply from them, after a length debate.

> 
> [..] there are indeed many properties in CSS3 which are copied 1:1 from
>  CSS2.1. Among new properties introduced in CSS3, you can find many CSS
>  2.1 definitions in CSS3 draft. Unfortunately, it's not the case with
>  position and some other properties [..]
> 
> 
> 

I have no grudge towards them, but am curious. Does `position` really not exist in CSS 3?