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Use Fetch's multipart/form-data serializer - #12992

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@annevk annevk commented Sep 25, 2026 •

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Use Fetch's multipart/form-data serializer

Form submission now uses Fetch's multipart/form-data chunk serializer, replacing the multipart/form-data encoding algorithm and boundary string defined here.

Tests: web-platform-tests/wpt#59216

Fetch PR: whatwg/fetch#1922

(See WHATWG Working Mode: Changes for more details.)


/form-control-infrastructure.html ( diff )
/infrastructure.html ( diff )

Form submission now uses Fetch's multipart/form-data chunk serializer, replacing the multipart/form-data encoding algorithm and boundary string defined here.

Tests: web-platform-tests/wpt#59216

Fetch PR: whatwg/fetch#1922
@annevk annevk mentioned this pull request Sep 25, 2026
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