Firefox Nightly adds ShadowRoot.setHTML() and sanitizer parameter

[hamishwillee]

FF140 adds remaining sanitizer method/options behind flag in https://bugzilla.mozilla.org/show_bug.cgi?id=1959727

Once FF140 becomes nightly, these would change to "preview".

Changes are:

• `ShadowRoot.setHTML()] - new method
• options.sanitizer added to param to ShadowRoot.setHTMLUnsafe() and Document.parseHTMLUnsafe()

This follows on from #26659

FYI @evilpie I was "somewhat wrong" in #26659. I can add them, just not as a "preview" release. I didn't think of this properly because I was so focused on FF139.

Related docs work being done in mdn/content#38890

[github-actions]

Tip: Review these changes grouped by change (recommended for most PRs), or grouped by feature (for large PRs).

[caugner]

Once FF140 becomes nightly, these would change to "preview".

Based on https://whattrainisitnow.com/, Firefox 140 currently is Nightly.

Is this planned to ship in 140? Then we can keep it as is, otherwise we should set it to "preview" now.

[evilpie]

I think this is still missing the sanitizer option for Element.setHTMLUnsafe.

Is this planned to ship in 140?

No

[hamishwillee]

@caugner @evilpie Thanks both

• Added missing method
• Changed to preview - my browser just switched to 140.
• Changed the subfeature in all methods to experimental.

Should be good now.

[evilpie]

I hadn't caught this, but considering these methods aren't available by default, shouldn't the compat info have the pref instead of a version?

[caugner]

I hadn't caught this, but considering these methods aren't available by default, shouldn't the compat info have the pref instead of a version?

Are these behind a pref even in Nightly? (Then yes.)

[caugner]

@hamishwillee PTAL at the comments above.

If the feature is not available by default in Nightly, then we should set flags.

[hamishwillee]

@caugner They are behind a flag that is enabled in nightly.

FYI only, the reason they were previously behind the flag was because when I started this process FF140 was not nightly, and that was the version this went in with.