1584663 - Add support for Fetch Priority (aka Priority Hints) to developer tools

Status: NEW

(DevTools :: Netmonitor, enhancement, P5)

Description

[Wellington Torrejais da Silva]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:71.0) Gecko/20100101 Firefox/71.0

Steps to reproduce:

Link: https://developers.google.com/web/updates/2019/02/priority-hints

Add support to Priority Hints to the Developer Tools

Actual results:

The browser does not make easy visible the resources loaded with priority hints.

Expected results:

Add full support for priority hints in the browser core and developer tools.

Thanks!

Comment 1

[Sebastian Padilla]

Hi Wellington Torrejais da Silva,

Thanks for submitting this enhancement to us.

I will add a Product and a Component so our devs can take a look at this.

Thanks!

Sebastian

Comment 2

[Rob Wu [:robwu]]

This feature isn't even implemented in Firefox, so naturally there is currently no way to have devtools support for it either.

This is a Chrome-only feature: https://www.chromestatus.com/feature/5273474901737472
... and not even an official standard: https://wicg.github.io/priority-hints/

I expect this bug to be closed, but I'll move it to the right component (DevTools) for them to decide.

Comment 3

[:Harald Kirschner :digitarald]

Related: https://github.com/mozilla/standards-positions/issues/25

Comment 4

[Sebastian Zartner [:sebo]]

As the specification links in https://bugzilla.mozilla.org/show_bug.cgi?id=1797715#c4 indicate, this feature is now called Fetch Priority.
Therefore I adjusted the summary of this bug to make it easier findable.

Regarding the UI, the most obvious way is probably a new "Priority" column in the Netmonitor as the Chrome DevTools have it.

Sebastian

Comment 5

[Mirko Brodesser (:mbrodesser) -- not reading bugmails currently]

Gecko's DevTools' Network tab nowadays provides a "Priority" column. It has to be enabled via the context-menu though.
With the fetchpriority pref set to true (https://searchfox.org/mozilla-central/rev/9137f80064364a41a1de394af4ce05dffdbf68e6/modules/libpref/init/StaticPrefList.yaml#117850, that column reflects the internal priority for elements with the fetchpriority attribute.
E.g. for https://jsfiddle.net/4bn0zre1/.

Chrome's DevTools also only show the internal priority. Not the fetchpriority's value.

Is that sufficient or is there benefit in showing the latter too?