Why aren't CSS3 PIE and other similar scripts used everywhere?

This question has already been asked in htc files: why not use them? but the answer didn’t really answer.

The question is why is something like CSS3 PIE  not used on many sites? I would expect the smaller ones to not know about it, but the one that caught my attention was Twitter, which does not use it.

Is it because it is not a standard? Or does this cause a noticeable slowdown in the site?

Thanks for any answers.

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I can’t speak for everyone, but I believe that you don’t see such tools that are used on large sites, because:

1) . CSS3 PIE, , ( , YMMV.) , , .

2) DOM. , / .. PIE - .

3) # 2 ( ) . , , .

CSS3 PIE , ( ), , Selectivizr. : . , PIE , , , Twitter, , .

... , , IE .. , , . - - , , , , .:)

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