[webkit-dev] content-visibility (Was Re: Request For Position on CSS containment)

Ryosuke Niwa rniwa at webkit.org
Thu Jun 24 13:23:05 PDT 2021

Please rename the subject when you're going to discuss the work on a new

On Thu, Jun 24, 2021 at 9:44 AM cathiechen via webkit-dev <
webkit-dev at lists.webkit.org> wrote:

> We made a lot of progress regarding CSS containment [1].
> Rob and I have finished the layout containment and size containment [2].\o/
> And the patches of paint containment and style containment are ready for
> review now [3].
> So we think now it's time to move on to content-visibility:
> (https://www.w3.org/TR/css-contain-2/#content-visibility)

That seems premature. Have we implemented all the perf optimizations for
layout, size, & paint containment? I'd rather not start piling on more
features before we get to a point where we're happy with the performance of
these features.

Since content-visibility depends on paint and style containment, we will do
> some specification research first, then prototype it based on Rob's patches.

Does the research part also include making a judgement call as to whether
it's a good idea at all? It's wholly unclear to me that content-visibility
is a feature we'd like to implement in WebKit given its implications to the
accessibility and other browser features.

- R. Niwa
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