Intent to Prototype: Render blocking status in Resource Timing

94 views
Skip to first unread message

Abin Paul

unread,
Jun 29, 2022, 10:53:46 AM6/29/22
to blin...@chromium.org

Contact emails

abin....@gmail.com


Explainer

https://github.com/abinpaul1/resource-timing/blob/render-blocking-status-explainer/Explainer/Render_Blocking_Status.md


Specification

Resource Timing PR : https://github.com/w3c/resource-timing/pull/327

Fetch PR : https://github.com/whatwg/fetch/pull/1449


Summary

Adds a field to PerfomanceResourceTiming to indicate the render blocking status of a resource. Currently from a developer perspective, the only way to determine which resources were actually render blocking is to rely on complex heuristics. The new field would instead provide a direct signal regarding the same.



Blink component

Blink>PerformanceAPIs>ResourceTiming


Motivation

Currently in order to determine which resources were actually render blocking and which ones were not, developers have to rely on heuristics.


By providing a web exposed field, developers can get a direct signal from the browser regarding the render blocking nature of each resource.



Initial public proposal

https://github.com/w3c/resource-timing/pull/327


TAG review



TAG review status

Pending


Risks



Interoperability and Compatibility



Gecko: No signal


WebKit: No signal


Web developers

Reception towards a similar feature introduced in Chromium was very positive. The article and tweet linked below is a good indicator.

https://blog.webpagetest.org/posts/new-render-blocking-indicator-in-chrome-and-webpagetest/ 

https://twitter.com/tkadlec/status/1417543014705246214



Other signals:


WebView application risks

Does this intent deprecate or change behaviour of existing APIs, such that it has potentially high risk for Android WebView-based applications?



Debuggability



Is this feature fully tested by web-platform-tests?

Yes


Flag name

RenderBlockingStatus


Requires code in //chrome?

False


Tracking bug

https://bugs.chromium.org/p/chromium/issues/detail?id=1337256


Estimated milestones

No milestones specified



Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5166965277589504


This intent message was generated by Chrome Platform Status.


Yoav Weiss

unread,
Jul 13, 2022, 7:19:22 AM7/13/22
to Abin Paul, blink-dev
Thanks for working on this!! :)

--
You received this message because you are subscribed to the Google Groups "blink-dev" group.
To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+...@chromium.org.
To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAM2ZH3dimwFkdjtC_1O5imD9HNJ6QvNPPuPJ5Me9ushAT9CKiA%40mail.gmail.com.
Reply all
Reply to author
Forward
0 new messages