Intent to Ship: Viewport-height client hint
Max Curran
Contact emails
ryan...@chromium.org, curr...@chromium.org
Explainer
https://github.com/WICG/responsive-image-client-hints/blob/master/Viewport-Height-Explainer.md
Specification
https://wicg.github.io/responsive-image-client-hints/#sec-ch-viewport-height
Summary
Currently, Responsive Image Client Hints provide a way for origins to obtain the viewport’s width. However, no such attribute exists for viewport height. We’ve observed that to optimize the loading of content that appears in viewport, it is essential for the origins to adapt HTML response based on viewport height.
Blink component
TAG review
https://github.com/w3ctag/design-reviews/issues/615
TAG review status
Issues addressed
Link to origin trial feedback summary
https://github.com/WICG/responsive-image-client-hints/issues
Risks
Interoperability and Compatibility
Gecko: No signal (https://github.com/mozilla/standards-positions/issues/79)
WebKit: Negative (https://lists.webkit.org/pipermail/webkit-dev/2020-November/031576.html) Likely to be neutral based on discussion in https://github.com/mozilla/standards-positions/issues/79
Web developers: No signals
Other signals:
Activation
None
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?
Debuggability
N/A
Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes
Is this feature fully tested by web-platform-tests?
Yes
Flag name
kViewportHeightClientHintHeader
Requires code in //chrome?
False
Tracking bug
https://bugs.chromium.org/p/chromium/issues/detail?id=1184863
Launch bug
https://bugs.chromium.org/p/chromium/issues/detail?id=1184862
Estimated milestones
Anticipated spec changes
Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (e.g. links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (e.g., changing to naming or structure of the API in a non-backward-compatible way).
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5646861215989760
Links to previous Intent discussions
Intent to Experiment: https://groups.google.com/a/chromium.org/g/blink-dev/c/Q2wcqY2UyNs/m/rPePdX_NBwAJ
Intent to Extend Experiment: https://groups.google.com/a/chromium.org/g/blink-dev/c/kftmeKVDjE8/m/GlaCr5PYEQAJ
This intent message was generated by Chrome Platform Status.
Daniel Bratell
What was the result of the origin trial? Did you get any useful feedback?
/Daniel
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Max Curran
Mike Taylor
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Chris Harrelson
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Yoav Weiss
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Joe Medley
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