imagesrcset and imagesizes attributes on link rel=preload

Category: Performance
Type: New or changed feature
Status: Enabled by default (Chrome 73)
Intent stage: None

Summary

Add imagesrcset and imagesizes attributes to <link rel=preload as=image>, that correspond to the srcset and sizes attributes of HTMLImageElement. We are using imagesizes here instead of sizes because it already has a different meaning for HTMLLinkElement in the rel=icon case.

Standards & signals

Specification: https://github.com/whatwg/html/pull/4048
Firefox: No signal
Safari: No signal
Web developers: Positive
Tracking bug: https://crbug.com/813452

Docs: https://docs.google.com/document/d/1wob4u9AER1kmUodqIEp78BuziSJChBl54A5ZRXPRCUI/edit#

Samples: https://irori.github.io/imagesrcset-demo/

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