Add language support for Ecmarkup #6152
Merged
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Description
This PR adds support for Ecmarkup, a superset of HTML used by TC39 for authoring language specifications and proposals. Since it's grouped under HTML, this addition is chiefly for the benefit of clearer highlighting.
Usage-wise, I'm actually not sure if it fulfils the criteria or not: Code Search reports ~1,700 results, but because this format is predominantly used by TC39, there's a good chance that 1,700 results fails to span 200 unique users. @lildude, make sure you assess popularity. 😉
Checklist:
The extension of the new language is used in hundreds of repositoriestc39/proposal-array-from-async/spec.html