Accept-Charset HTTP header removed - not sent by any browser for many years and deprecated

[hamishwillee]

This removes the Accept-Charset header. Not sent by browsers and is deprecated

Historically form elements had an attribute acceptcharset that took same values. This now only takes "UTF-8" if specified, so I tidied that up as well.

[github-actions]

Preview URLs (8 pages)

• /en-US/docs/Glossary/Forbidden_header_name
• /en-US/docs/Learn/Server-side/First_steps/Client-Server_overview
• /en-US/docs/Mozilla/Firefox/Releases/10
• /en-US/docs/Web/API/HTMLFormElement/acceptCharset
• /en-US/docs/Web/API/HTMLFormElement
• /en-US/docs/Web/HTML/Attributes
• /en-US/docs/Web/HTML/Element/form
• /en-US/docs/Web/HTTP/Headers

Flaws (40)

Note! 6 documents with no flaws that don't need to be listed. 🎉

URL: /en-US/docs/Mozilla/Firefox/Releases/10
Title: Firefox 10 for developers
Flaw count: 5

• macros:
  • /en-US/docs/Web/CSS/:-moz-full-screen-ancestor does not exist
• broken_links:
  • Can't resolve /en-US/docs/Mozilla/Firefox/Updating_add-ons_for_Firefox_10
  • Can't resolve /en-US/docs/PRBool
  • Can't resolve /en-US/docs/Install_Manifests#strictcompatibility
  • Can't resolve /en-US/docs/Extensions/Bootstrapped_extensions#Adding_user_interface_with_a_chrome.manifest

---

URL: /en-US/docs/Web/HTML/Attributes
Title: HTML attribute reference
Flaw count: 35

• broken_links:
  • Can't resolve /en-US/docs/Web/HTML/Attributes/alt
  • Can't resolve /en-US/docs/Web/HTML/Attributes/autoplay
  • Can't resolve /en-US/docs/Web/HTML/Attributes/cite
  • Can't resolve /en-US/docs/Web/HTML/Attributes/colspan
  • Can't resolve /en-US/docs/Web/HTML/Attributes/controls
  • and 30 more flaws omitted

External URLs (14)

URL: /en-US/docs/Glossary/Forbidden_header_name
Title: Forbidden header name

• https://crbug.com/571722 (1 time)
• https://fetch.spec.whatwg.org/ (2 times)

---

URL: /en-US/docs/Web/HTTP/Headers
Title: HTTP headers

• https://datatracker.ietf.org/doc/html/rfc4229 (1 time)
• https://datatracker.ietf.org/doc/html/rfc6648 (1 time)
• https://developers.google.com/search/docs/crawling-indexing/robots-meta-tag (1 time)
• https://en.wikipedia.org/wiki/List_of_HTTP_header_fields (1 time)
• https://firefox-source-docs.mozilla.org/devtools-user/debugger/how_to/use_a_source_map/index.html (1 time)
• https://github.com/protocol-registries/http-fields?tab=readme-ov-file (1 time)
• https://httpwg.org/specs/ (1 time)
• https://tc39.es/ecma262/ (1 time)
• https://w3c.github.io/ServiceWorker/ (1 time)
• https://wicg.github.io/webpackage/draft-yasskin-http-origin-signed-responses.html (3 times)
• https://www.adobe.com/devnet-docs/acrobatetk/tools/AppSec/CrossDomain_PolicyFile_Specification.pdf (1 time)
• https://www.iana.org/assignments/http-fields/http-fields.xhtml (2 times)

[bsmth]

LGTM, thanks. I don't see any other leftovers to remove 👍🏻