Demix media load events from GlobalEventHandlers

[queengooborg]

This PR demixes the load event handlers for media elements from the GlobalEventHandlers mixin. Related BCD PR: mdn/browser-compat-data#16925

[github-actions]

Preview URLs

• https://pr18311.content.dev.mdn.mozit.cloud/en-US/docs/Mozilla/Firefox/Releases/52
• https://pr18311.content.dev.mdn.mozit.cloud/en-US/docs/Web/API/GlobalEventHandlers
• https://pr18311.content.dev.mdn.mozit.cloud/en-US/docs/Web/API/HTMLMediaElement/loadeddata_event
• https://pr18311.content.dev.mdn.mozit.cloud/en-US/docs/Web/API/HTMLMediaElement/loadedmetadata_event
• https://pr18311.content.dev.mdn.mozit.cloud/en-US/docs/Web/API/HTMLMediaElement/loadstart_event

Flaws

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

URL: /en-US/docs/Mozilla/Firefox/Releases/52
Title: Firefox 52 for developers
on GitHub
Flaw count: 1

• macros:
  • /en-US/docs/Web/API/Window/appinstalled does not exist

---

URL: /en-US/docs/Web/API/GlobalEventHandlers
Title: GlobalEventHandlers
on GitHub
Flaw count: 16

• macros:
  • /en-US/docs/Web/API/GlobalEventHandlers/onabort redirects to /en-US/docs/Web/API/HTMLMediaElement/abort_event
  • /en-US/docs/Web/API/GlobalEventHandlers/oncontextmenu redirects to /en-US/docs/Web/API/Element/contextmenu_event
  • /en-US/docs/Web/API/GlobalEventHandlers/onformdata redirects to /en-US/docs/Web/API/HTMLFormElement/formdata_event
  • /en-US/docs/Web/API/GlobalEventHandlers/onprogress does not exist
  • /en-US/docs/Web/API/GlobalEventHandlers/onratechange does not exist
  • and 8 more flaws omitted
• bad_bcd_links:
  • no explanation!
  • no explanation!
  • no explanation!

---

URL: /en-US/docs/Web/API/HTMLMediaElement/loadedmetadata_event
Title: HTMLMediaElement: loadedmetadata event
on GitHub
Flaw count: 1

• broken_links:
  • Can't resolve /en-US/docs/Introducing_the_Audio_API_Extension

External URLs

URL: /en-US/docs/Mozilla/Firefox/Releases/52
Title: Firefox 52 for developers
on GitHub

No new external URLs

---

URL: /en-US/docs/Web/API/GlobalEventHandlers
Title: GlobalEventHandlers
on GitHub

No external URLs

---

URL: /en-US/docs/Web/API/HTMLMediaElement/loadstart_event
Title: HTMLMediaElement: loadstart event
on GitHub

No new external URLs

---

URL: /en-US/docs/Web/API/HTMLMediaElement/loadedmetadata_event
Title: HTMLMediaElement: loadedmetadata event
on GitHub

No new external URLs

---

URL: /en-US/docs/Web/API/HTMLMediaElement/loadeddata_event
Title: HTMLMediaElement: loadeddata event
on GitHub

No new external URLs

(this comment was updated 2022-07-23 04:44:33.229316)

[teoli2003]

We also need an HTMLMediaElement/loadend_event page.

[queengooborg]

We also need an HTMLMediaElement/loadend_event page.

Actually, apparently not. @foolip mentioned that loadend isn't an HTMLMediaElement, so the documentation is inaccurate.

[foolip]

That's right. Because media element resources are fetched using range requests, the whole thing might never be loaded at the same time, so there's no event for that, just events like "canplaythrough".

[teoli2003]

So does this mean that this comment:

• The {{domxref("HTMLMediaElement/loadstart_event", "loadstart")}} and {{domxref("HTMLMediaElement/loadend_event", "loadend")}} events are now fired on {{htmlelement("img")}} elements (see {{bug(1264769)}}).

is wrong?

[queengooborg]

It's possible that Firefox had a non-standard loadend event on HTMLMediaElement, so that changelog comment is not wrong, but the domxref to HTMLMediaElement.loadend_event should be removed. I'm creating a PR for loadend and will remove the link there!

[foolip]

Looks like "loadstart" and "loadend" events for <img> are still in Firefox:
https://bugzilla.mozilla.org/show_bug.cgi?id=1574487

Confirmed with https://software.hixie.ch/utilities/js/live-dom-viewer/?saved=10465.

[foolip]

Isn't there a loadstart page that needs updating too?

[teoli2003]

Looks good to me. If I'm mistaken, let's open follow-up PRs.