Remove the contextmenu global HTML attribute

[hamishwillee]

This attribute has been removed from all tracked browsers for more than 2 years, and has been removed from BCD.

Associated BCD PR mdn/browser-compat-data#22593
Fixes #32448

[github-actions]

Preview URLs

• /en-US/docs/Mozilla/Firefox/Releases/20
• /en-US/docs/Web/HTML/Attributes
• /en-US/docs/Web/HTML/Global_attributes

Flaws (36)

Note! 2 documents with no flaws that don't need to be listed. 🎉

URL: /en-US/docs/Web/HTML/Attributes
Title: HTML attribute reference
Flaw count: 36

• 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 31 more flaws omitted

External URLs (9)

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

• https://dom.spec.whatwg.org/ (1 time)
• https://html.spec.whatwg.org/multipage/common-microsyntaxes.html (1 time)
• https://html.spec.whatwg.org/multipage/interaction.html (1 time)
• https://html.spec.whatwg.org/multipage/urls-and-fetching.html (2 times)
• https://w3c.github.io/html-media-capture/ (1 time)

---

URL: /en-US/docs/Web/HTML/Global_attributes
Title: Global attributes

• https://datatracker.ietf.org/doc/html/rfc5646 (1 time)
• https://html.spec.whatwg.org/multipage/microdata.html (1 time)
• https://schema.org/ (1 time)

---

URL: /en-US/docs/Mozilla/Firefox/Releases/20
Title: Firefox 20 for developers

• https://bugzil.la/736321 (1 time) (Note! This may be a new URL 👀)