Intent to Prototype: Render blocking status in Resource Timing
Abin Paul
Contact emails
Explainer
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
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