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Mozilla actually had something similar to JSX at one point: https://developer.mozilla.org/en-US/docs/Archive/Web/E4X https://developer.mozilla.org/en-US/docs/A

• osdevisnot 7y ago
  JSX sure has some overlap with E4X, however, JSX has no relation to the E4X specification: https://facebook.github.io/jsx/#prior-art https://facebook.github.io/jsx/#prior-art