Followup: it turns out this wasn't quite ready to be enabled for 68, so I'm now targeting Firefox 69 as the release where CSS Containment will be default-enabled in release.
On Mon, Mar 18, 2019 at 12:01 PM Daniel Holbert <dholb...@mozilla.com> wrote: > As of today (March 18th 2019), I intend to turn CSS Containment > <https://drafts.csswg.org/css-contain/> on by default on all platforms, > in Firefox Nightly 68. It has been developed behind the > 'layout.css.contain.enabled' preference. > > Other UAs shipping this or intending to ship it are: > * Chrome & other Blink-based UAs (Chrome has supported since Chrome 52, > released in 2016, according to caniuse > <https://caniuse.com/#search=contain>). > > Bug to turn on by default: > * https://bugzilla.mozilla.org/show_bug.cgi?id=1532471 is where I'll be > turning it on in Nightly by default (with a guard to only let it ship as > far as early-beta) > * https://bugzilla.mozilla.org/show_bug.cgi?id=1487493 is where I'll be > removing the guard & letting it ride the trains to release, assuming > everything goes well. (I anticipate that this will happen for the Firefox > 68 release cycle.) > > This feature was previously discussed in this "intent to implement" > thread: > https://groups.google.com/d/msg/mozilla.dev.platform/q-uXVVClcU4/WswhXtlWqFIJ > (though the spec and the feature have evolved a good deal since then) > > Note: we don't currently intend to ship support for one of the keywords > mentioned in the spec & which Chrome sort-of supports -- "contain:style". > Chrome doesn't implement this keyword properly/robustly, and we have doubts > about whether the complexity & maintenance burden of a correct > implementation would be justified by this keyword's limited use cases. See > https://github.com/w3c/csswg-drafts/issues/3280 for more on this. The CSS > Working group has marked this keyword as "at-risk", as a result of the > discussion around these concerns. > > Many thanks to former-interns Morgan Reschenberg, Yusuf Sermet, and Kyle > Zentner for their hard work on this feature! > _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
