Safari sucks at rendering pages properly, though it's certainly better than most of the other Mac browsers.
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But I agree with the IE-only mindset/attitude of a good majority of web page designers
Safari is actually worse at supporting standards than IE and Moz derivatives and it's still slower.
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essentially, all other browsers have to bend the "standard correctness" in order to behave like IE.
Read this:
http://arstechnica.com/reviews/003/software/mac/browser/mac-browsers-1.html
