Since React launched, I have been labouring under the misapprehension that JSX was a little-used ECMAScript feature that had been dropped from the standard.
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Since React launched, I have been labouring under the misapprehension that JSX was a little-used ECMAScript feature that had been dropped from the standard. But I was wrong! I was thinking of E4X, which worked a lot like JSX, and was supported by Firefox from the mid-2000s to the early 2010s.
https://en.wikipedia.org/wiki/JavaScript_XML
https://en.wikipedia.org/wiki/ECMAScript_for_XML
It's interesting that Facebook decided to reinvent E4X, rather than using the existing standard.