1860729 - Enable lazy loading iframes by default

Status: RESOLVED FIXED

(Core :: DOM: Core & HTML, task)

Description

[Oliver Medhurst [:canadahonk]]

We turned it Nightly only in Bug 1860057 due to some regressions reported in Nightly.

Comment 1

[Oliver Medhurst [:canadahonk]]

I plan to turn this on such that it is released in Fx121. Letting it ride Nightly for a while to catch more potential regressions, then I'll make a patch and push (probably early next week if no opposition?). NIing myself to do so when described.

Comment 2

[Oliver Medhurst [:canadahonk]]

Attachment: Bug 1860729 - Enable lazy loading iframes by default

Let's ship lazy loading iframes in Fx121 if no more regressions are
found in Nightly.

If agreed and nothing else is found, I'll land this patch ~Nov 6.

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/be38e5d0e368
Enable lazy loading iframes by default r=zcorpan,emilio

Comment 4

[Cristian Tuns]

https://hg.mozilla.org/mozilla-central/rev/be38e5d0e368

Comment 5

[Oliver Medhurst [:canadahonk]]

Release Note Request (optional, but appreciated)
[Why is this notable]: New web platform feature
[Affects Firefox for Android]: Yes
[Suggested wording]: Lazy loading iframes are now supported (<iframe loading=lazy>). Lazy loading iframes are only loaded when visible, so non-critical iframes can load later when needed to speed up initial page loads, reduce initial network usage, etc.
[Links (documentation, blog post, etc)]: https://developer.mozilla.org/en-US/docs/Web/Performance/Lazy_loading

Comment 6

[Ryan VanderMeulen [:RyanVM]]

Added to the Fx121 relnotes.

Comment 7

[Hamish Willee]

FF121 MDN docs work for this can be tracked in https://github.com/mdn/content/issues/30340 - basically a release note and a compatibility data update.