Intent to Implement: CSS Containment

[Levi Weintraub]

Contact emails le...@chromium.org Spec https://drafts.csswg.org/css-containment/ Summary A primitive for isolating style, layout, and paint. This allows authors to explicitly opt into a set of restrictions that enables user agent optimizations. Motivation With a simple change, we can enable authors to opt into pre-existing optimizations for layout-constrained content (subtree roots), and potentially enable further optimizations down the line. Compatibility Risk Firefox: Mixed public signals (I'll be following up with them about their concerns) Edge: No public signals Safari: No public signals Web developers: No signals Describe the degree of compatibility risk you believe this change poses Very low. Reaching spec-compliance is quite simple. Ongoing technical constraints None Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)? Yes or no. Yes. OWP launch tracking bug https://crbug.com/561713 Link to entry on the Chrome Platform Status https://www.chromestatus.com/features/6522186978295808 Requesting approval to ship? No.

[Alex Russell]

Would love to see this run past the TAG SRTL (we have a face-to-face meeting in January where we can take it up).

Question: does paint containment imply clipping for drop shadows? I assume it also clips transform()s?

On Wed, Nov 25, 2015 at 2:09 PM, Levi Weintraub <le...@chromium.org> wrote:

Contact emails le...@chromium.org Spec https://drafts.csswg.org/css-containment/ Summary A primitive for isolating style, layout, and paint. This allows authors to explicitly opt into a set of restrictions that enables user agent optimizations. Motivation With a simple change, we can enable authors to opt into pre-existing optimizations for layout-constrained content (subtree roots), and potentially enable further optimizations down the line. Compatibility Risk Firefox: Mixed public signals (I'll be following up with them about their concerns) Edge: No public signals Safari: No public signals Web developers: No signals Describe the degree of compatibility risk you believe this change poses Very low. Reaching spec-compliance is quite simple. Ongoing technical constraints None Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)? Yes or no. Yes. OWP launch tracking bug https://crbug.com/561713 Link to entry on the Chrome Platform Status https://www.chromestatus.com/features/6522186978295808 Requesting approval to ship? No.

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[Levi Weintraub]

On Wed, Nov 25, 2015 at 2:50 PM, Alex Russell <sligh...@google.com> wrote:

Would love to see this run past the TAG SRTL (we have a face-to-face meeting in January where we can take it up).

Sounds good to me :)

 

Question: does paint containment imply clipping for drop shadows? I assume it also clips transform()s?

+tab to keep me honest

My expectation and understanding is yes to both; paint containment would clip all visual overflow/out of flow/transformed descendants.

[Ojan Vafai]

On Wed, Nov 25, 2015 at 2:50 PM, 'Alex Russell' via blink-dev <blin...@chromium.org> wrote:

Would love to see this run past the TAG SRTL (we have a face-to-face meeting in January where we can take it up).

Just curious, why? What specifically do you want to discuss?