Hi Dominic, thanks for your suggestions in the I2S As suggested, our current action involves writing WPTs to better understand the expected behavior of missing CSS values. This will enable us to present more informed and concrete results to the CSSWG and other platforms, fostering clearer discussions and more consistent implementations.
We will update the I2S once that step that done. From: Domenic Denicola <dome...@chromium.org> Sent: Friday, June 13, 2025 7:33 AM To: blink-dev <blink-dev@chromium.org> Cc: Divyansh Mangal <dman...@microsoft.com> Subject: [EXTERNAL] Re: Intent to Ship: Support width and height as presentation attributes on nested <svg> elements This intent feels a little risky, because, as WebKit points out<https://github.com/WebKit/standards-positions/issues/509> in their standards-positions issue, there isn't really an adequate specification for how SVG layout works in cases like this. For example, how it will behave with non-px values. (The WPTs you link only include px values.) Since SVG2 is a mostly-unmaintained specification, and this feature has at least some web developer demand, I don't want to require that you specify everything perfectly here. But I'd like to see at least some of: * Discussion with other implementers in the standards positions issues. (You've started these discussions, but I'd like to give them more time to settle.) * More exhaustive web platform test coverage, including values like `min-content`, `calc-size()`, `20em`, `50%`, `auto`, `stretch`, `50vh`, etc. * Some discussion in the CSSWG about how they would like to see this specified in the future. * A pull request to update the relevant parts of the SVG2 spec with some vague language about the expected results; it doesn't have to be rigorous, but it should be at least enough for other implementers to understand how to follow our behavior. Not all of these are required, and if I had to pick a single one that was most important, it would be expanded web platform test coverage. On Wednesday, June 11, 2025 at 10:28:17 PM UTC+9 dma...@microsoft.com<mailto:dma...@microsoft.com> wrote: Contact emails dman...@microsoft.com<mailto:dman...@microsoft.com> Explainer None Specification https://svgwg.org/svg2-draft/geometry.html#Sizing Summary This feature supports applying width and height as presentation attributes on nested <svg> elements through both SVG markup and CSS. This dual approach provides even greater flexibility for developers, allowing them to manage and style SVG elements more efficiently within complex designs. With this feature the below two html will now have the same output: With CSS Properties for nested <svg> element: <svg width="100px" height="100px"> <svg style="width:50px;height:50px;"> <circle cx="50px" cy="50px" r="40px" fill="green" /> </svg> </svg> Without CSS Properties for nested <svg> element: <svg width="100px" height="100px"> <svg width="50px" height="50px"> <circle cx="50px" cy="50px" r="40px" fill="green" /> </svg> </svg> Blink component Blink>SVG<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ESVG%22> TAG review None TAG review status Not applicable Risks Interoperability and Compatibility None Gecko: No signal (https://github.com/mozilla/standards-positions/issues/1243) In Firefox, the width and height attributes cannot be applied on nested <svg> elements as styles WebKit: Neutral (https://github.com/WebKit/standards-positions/issues/509) In Safari, the width and height attributes cannot be applied on nested <svg> elements as styles Web developers: Positive 7 people have upvoted this in the chromium issue. 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 Existing Devtools capabilities already support this feature. Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)? Yes Is this feature fully tested by web-platform-tests<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>? Yes WPTs in chromium: https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/web_tests/external/wpt/svg/styling/nested-svg-sizing.svg https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/web_tests/external/wpt/svg/styling/nested-svg-sizing-with-use.svg Flag name on about://flags None Finch feature name WidthAndHeightAsPresentationAttributesOnNestedSvg Rollout plan Will ship enabled for all users Requires code in //chrome? False Tracking bug https://issues.chromium.org/issues/40409865 Estimated milestones Shipping on desktop 139 Shipping on Android 139 Shipping on WebView 139 Shipping on iOS 139 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). None Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5178789386256384?gate=5132029741760512 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. 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