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What is it? I loaded it up in Internet Explorer and the page wouldn't render.
If you don't show up to take the exam, it's pretty obvious what your grade will be.
I loaded the page in IE8 and it's barely readable. Almost nothing shows up. I guess that's the score itself.
Very nice. One quibble - The warning in the top right is a tiny bit ambiguous, it would read better as:

"Caution: This test checks which CSS3 features the browser recognizes, not whether they are implemented correctly."

Now there's a nice surprise, Nightly (Firefox-alpha build) actually scores one percent higher than Chrome Canary. I do hope Mozilla catches up in other areas, there needs to be more than one large non-Webkit browser out there to push the web forward.
I don't disagree, but why does there need to be another rendering engine? Webkit do push forward too.
Gecko pushed forward too. Then they stopped, they got large and bulky. Things changes, one day Webkit won't be the ones to be first with the new. Competition fuels this process.

We should have learned this lesson from Internet Explorers dominance in the past.

WebKit isn't the first with the new today. In terms of features Firefox and Chrome (not WebKit generally, specifically Chrome) are pretty much neck and neck. They each have their priorities which reflects which "beats" the other in specific features. Chrome has already released Web RTC and Web Intents, Firefox has already released calc() and (current) IndexedDB.

I think you're referring to Firefox from a couple of years ago, their pace has ramped up since they moved to rolling releases.

Well, I am referring to the image the (slightly techish) public has of Firefox as an outdated, slow competitor to Chrome. As I follow it's development closely, however, I am aware they are getting better again and this I why still use it as my primary browser.
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Does this check vendor prefixed (-webkit,-moz,...) "features" too?
Yes, as long as their unprefixed equivalent is in a W3C specification.
I am actually a bit surprised the latest Opera didn't score better than 56%. Oh well, I guess I'd complain about the speed if everything was implemented.
Hmm, Firefox 9.0.1 scored 0% (with Ghostery installed); Forefox 10 scored 60%. They both still score 95% in the Acid3 test. I'm not uninstalling Ghostery, whatever the score.
Thank you for mentioning Ghostery, they have a Chrome extension too!
Firefox scores 0% with NoScript installed as well.
9.0.1 scored 58%.
Anyone tried IE9 ? I wonder how much it scores.