Update: This article is more or less misleading. According to Asa Dotzler (mozilla.org) ↓. The CSS Error is intentionally added by the “Web Standards Group” for Error handling test.
I read this news at kakkoi recently, following up on announcements at IEblog about their recent glorified claimed with IE8 ACID2 Milestone .
Acid 2
For those who doesn’t know much bout CSS specifications. ACID2 is a standard CSS Test page maintained by The Web Standards groups. This is where Browser Vendor test their Browser CSS rendering capability. The first batch to pass this test is opera 9.1, icab (osx) & Firefox 3a.
The most popular browser vendor (Microsoft Internet Explorer) just pass this test for IE8 (a) Browser. I’m quite happy as Internet Explorer is a big liability to support by most web developer. Unfortunately The ACID2 Test pages FAILED W3C CSS2.1 Validations.
43 Parse Error - second two] 88 .parser-container div Value Error : color orange is not a color value : orange 94 .parser Property error doesn't exist : } 97 .parser Property m rgin doesn't exist : 2em 97 Parse error - Unrecognized }; 99 .parser Value Error : width only 0 can be a length. You must put an unit after your number : 200 100 .parser Value Error : border Lexical error at line 96, column 38. Encountered: "e" (101), after : "! "error; 100 .parser Value Error : border Parse error - Unrecognized } 101 .parser Value Error : background Too many values or values are not recognized : red pink
A serious 
Kaizeku 