2.1.91 [HTML5:2014] Section 4.10.22.7 Multipart form data
V0207: Forms are always encoded as UTF-8
The specification states:
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... Multipart form data The multipart/form-data encoding algorithm is as follows: ... 2. If the algorithm was invoked with an explicit character encoding, let the selected character encoding be that encoding. ... ... Otherwise, let the selected character encoding be UTF-8.
All document modes (All versions)
Forms are always encoded as UTF-8.