Contact emails
[email protected]

Explainer
https://github.com/WICG/nav-speculation/blob/main/prerendering-cross-origin-iframes.md


Specification
https://wicg.github.io/nav-speculation/prerendering.html


Summary

Prerenders cross-origin iframes with an opt-in response header. Browsers will 
now prerender all cross-origin frames if the top-level frame's HTTP response 
includes the Supports-Loading-Mode: prerender-cross-origin-frames.



Blink component
Blink


Motivation

By default, navigational prerendering delays the loading of all cross-origin 
iframes until the referring page activates the prerendered page. However, there 
are some cases where cross-origin iframes are particularly important to an 
application, such that delaying them negates many of the benefits of 
prerendering.



Initial public proposal
None


TAG review
None


TAG review status
Not applicable


Risks




Interoperability and Compatibility

None


Gecko: No signal

WebKit: No signal

Web developers: Positive Our partners show interests in having this feature.

Other signals:


WebView application risks

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

None




Debuggability

The cross-origin iframe prerendering should be debuggable as well as top 
frame's one: 
https://developer.chrome.com/docs/devtools/application/debugging-speculation-rules#prerender



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


Flag name on about://flags
None


Finch feature name
Prerender2CrossOriginIframes


Requires code in //chrome?
False


Estimated milestones

No milestones specified



Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5112398709129216?gate=5179872041369600


This intent message was generated by Chrome Platform Status.

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