Bug 666041 is on the main CSS3 flexbox implementation, but there may be a bit of followup work to do in helper-bugs that will land separately. I'm filing this bug to track the work that we need to do before we're ready to enable flexbox in nightly builds.

Here's the patch to toggle flexbox on in builds (formerly posted as "patch 99" on bug 666041)

NOTE: this bug is really a tracker for when flexbox is ready to be enabled in builds & exposed to the web by default. If it turns out we can easily pref properties off (soon w/ paris DOM bindings -- maybe it's already possible?), then we can enable MOZ_FLEXBOX in builds ASAP, but just pref off its properties (so that developers can toggle the pref to try it out while pieces are still landing). Then, we can morph this bug into preffing it on.

Updated patch to also uncomment the flexbox-reftest line in layout/reftests/reftest.list

I'm clarifying this bug's summary to be track *fully enabling* flexbox by default. (I'm going to spin off a separate bug on enabling the build flag, so that the flexbox code will compile but will still be preffed off per bug 796212.)

Comment on attachment 666341 [details] [diff] [review] patch v2 to enable flexbox in builds (In reply to Daniel Holbert [:dholbert] from comment #4) > (I'm going to spin off a separate bug on enabling the build flag Spun off bug 797022 for that. Obsoleting the patch on this bug here -- it's being replaced by a few patches over on that new bug.

For reference, here's what the patch for this bug would look like now -- just a pref tweak.

I think we should turn this on, at least in nightly builds. (Though we may decide to turn it off again on the Beta and possibly Aurora channels, when this patch makes it to those, depending on how spec-compliant/bug-free we are at that point.) Patch attached to enable this and update our automated tests' expectations about the pref being [dis|en]abled. Try run: https://tbpl.mozilla.org/?tree=Try&rev=f8133fcad6ca

Comment on attachment 689451 [details] [diff] [review] patch v4: enable flexbox pref, and tweak reftests/mochitests accordingly r=dbaron

oops, that had the wrong bug number. (inverted two digits) Backed out: https://hg.mozilla.org/integration/mozilla-inbound/rev/4bf567bd1a3c and re-landed w/ that fixed: https://hg.mozilla.org/integration/mozilla-inbound/rev/9bf579519470