Intent to Prototype: Prerender2 for Desktop

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Takashi Toyoshima

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May 27, 2022, 4:50:23 AMMay 27
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Contact emails

toyo...@chromium.org, robe...@chromium.org, ken...@chromium.org, jx...@chromium.org, nhi...@chromium.org, kou...@chromium.org, angel...@google.com


Explainer

https://github.com/WICG/nav-speculation/blob/main/README.md


Specification

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


Design docs

https://docs.google.com/document/d/1EpLshvc9RRW3vswmXsJGrbCkhlFmxDsWfbvgxmYDTfs/edit?usp=sharing


Summary

To achieve parity among the all supporting platforms, we implement the Prerender2 for Desktop in addition to Android.


We are going to ship the same-origin prerendering triggered by the speculation rules API and running experiments on Omnibox triggered prerendering on Android. We also enable these prerendering on Desktop.


See also [1] Same-origin prerendering triggered by the speculation rules API


[1] https://chromestatus.com/feature/5355965538893824


Blink component

Internals>Preload>Prerender



Risks



Interoperability and Compatibility



Gecko: No signal


WebKit: No signal


Web developers: No signals


Other signals:

It affects the Chrome Extensions APIs surface. Baseline changes were already discussed at the WECG for the FencedFrames/MPArch support, and we just follow it to support prerendering. Detailed plans are discussed in the design docs.

NaCl is another Desktop only feature, but we don’t support NaCl in prerendering pages as the feature NaCl is deprecated. We cancel prerendering when we find a NaCl in a prerendering page.


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?



Tracking bug

https://crbug.com/1278141


Estimated milestones

m105


Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5197044678393856


This intent message was generated by Chrome Platform Status.


--
Takashi Toyoshima
Software Engineer, Google
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