→ jQuery UI bug with fixed position scroll offsets in Safari 4
jQuery UI has a bug with Safari 4 that causes incorrect scroll offset values to be used for fixed position elements. This interferes with drag and drop behaviours (and probably other things) if the window has been scrolled at all.
I’ve filed a bug, but the fix is fairly simple — they were already using a workaround for Safari because Safari 3 didn’t treat scroll offsets correctly, so the fix is to check the WebKit version number before using the workaround. Safari 4 starts at WebKit version 526.
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