On Saturday 2015-03-21 11:27 -0700, Patrick Walton wrote: > 2. *Avoid going through style recalculation for transitions.* Style > recalculation (including CSS selector matching and layout object > construction) fundamentally has to access the DOM. But there is no need to > actually do this to update style objects for CSS transitions. My > work-in-progress transitions branch implements a "back door" that allows > style to be updated without going through style recalculation if we know in > advance which properties are to be updated. Coupled with (1) above, this > allows these transitions to be fully dissociated from the main thread.
For what it's worth, in Gecko I made it so that ticking of transitions doesn't do selector matching (which is fundamentally the bit that needs to touch the DOM) in https://bugzilla.mozilla.org/show_bug.cgi?id=1087536 But we still rebuild style data from the style rules using the normal codepaths; we're just making a fast substitution into the list of matched style rules (i.e., the path in the rule tree). -David -- 𝄞 L. David Baron http://dbaron.org/ 𝄂 𝄢 Mozilla https://www.mozilla.org/ 𝄂 Before I built a wall I'd ask to know What I was walling in or walling out, And to whom I was like to give offense. - Robert Frost, Mending Wall (1914)
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