4096 bytes is more than enough for everybody

Ever try to make an AJAX call from JavaScript, only to find out that your data is truncated at around the 4k mark? If so, you must be using Firefox 3. Although there is a workaround described here, it means you have to write extra, special code to check for a custom property to really get all the data.

You can test this problem using this QuirksMode page. The page notes other limits on Opera and the Macintosh version of IE, but on the current (v11) version of Opera, I was unable to duplicate it. I also don't have a Mac, so I couldn't verify it there, either. Only Firefox fails to copy the whole text block.

Apparently, this has been fixed in Firefox 4, but that's small consolation when you're tasked with supporting what people are actually using.

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