Contact emails curran...@chromium.org, ryanst...@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 Blink>Loader <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ELoader> 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? Goals for experimentation Client hints opt-ins from origins are session-sticky which makes it difficult to experiment with using origin trials since origin trials operate at document-level. We plan to run an A/B experiment using Chrome’s field trial infrastructure. Our plan is to enable the feature for at most 1% users to collect metrics, and ship this feature only if it shows performance improvement for origins that choose to use this feature. Reason this experiment is being extended Due to Chrome approvals taking longer than expected, and partners still needing to implement how to use the client hint, we have not been able to experiment yet. We would like to extend the origin trial from M101 to M104. Ongoing technical constraints 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 <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md> ? 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 OriginTrial desktop last 101 → 104 OriginTrial desktop first 99 OriginTrial android last 101 → 104 OriginTrial android first 99 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 This intent message was generated by Chrome Platform Status <https://chromestatus.com/>. -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CA%2BEneNNpr4CxoeqmHxgyTK3shuoN3f5T6hpfzkoT-zY2wR1SgA%40mail.gmail.com.
