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Comment on JavaScript once had a JSX-like syntax called E4X

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One bit of E4X trivia: a bug in the Firefox E4X implementation was taken advantage of by an exploit called "EgotisticalGiraffe", according to the Snowden documents. The implementation of E4X in Firefox was large and complex.

https://www.schneier.com/blog/archives/2013/10/how_the_nsa_a...

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