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TC39

Technical Committee 39 of {{Ecma International}}, the body that standardizes {{ECMAScript}} and steers the long-term evolution of {{JavaScript}}.

TC39 (Technical Committee 39) is the Ecma International committee responsible for maintaining and evolving the ECMAScript specification (ECMA-262) and the related internationalization specification (ECMA-402). Its members are Ecma member organizations — primarily browser vendors such as Google, Apple, Mozilla, and Microsoft, plus large web companies — who send delegates to plenary meetings several times per year. Decisions are made by consensus. New language features advance through a five-stage process: Stage 0 (strawperson), Stage 1 (proposal with a champion), Stage 2 (draft spec text), Stage 3 (candidate, ready for implementation feedback), and Stage 4 (finished, included in the next yearly edition). A core working principle is backward compatibility: TC39 will not ship a change that breaks existing pages on the open web, which is why historical quirks such as the loose equality coercion table remain in the language even when newer alternatives like === exist.

Metadata

Topic

Uncategorized

Confidence

92%

Sources

1 source

Views

Created

June 05, 2026

Community

0 0

Related Knowledge

ECMAScript

related Strength: 70%

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