sendBeacon() integration

[annevk]

According to https://bugs.webkit.org/show_bug.cgi?id=177579 no browser implements this. This appears true in Chromium and WebKit.

1. Load https://tests.caniuse.com/?feat=beacon.
2. Once everything has loaded, run performance.getEntriesByType("resource").
3. Observe no "beacon" entries in the result.

[yoavweiss]

^^ @noamr

[noamr]

Oh need to see if this was ever implemented, I don't remember what exactly I checked when porting this stuff to fetch/RT.

[yoavweiss]

Is it correct to say that the next steps here would be to add a WPT that verifies what implementations actually do, and then align the spec on that?

Since no user has complained about this, I'm guessing the use case for this is not very important (as by the time that the beacon is sent, it's too late to report on the beacon itself, unless you send another beacon to report on the previous one, ad infinitum)

[annevk]

That makes sense to me.