On Mon, Mar 9, 2026, 6:53 PM Alex Russell <[email protected]> wrote:
> I would hope that all forced layouts that generate long jank > (`getComptuedStyle()` in Noam's example) would generate these events. Is > there reason to believe they would/should not? They all do, but there is no distinction between time spent in style vs layout computation. This is a problem of missing attribution, the time spent in "style and layout" seems like a big opaque purple box that developers cannot influence or understand. > Best, > > Alex > > On Monday, March 9, 2026 at 5:30:17 AM UTC-7 Noam Rosenthal wrote: > >> On Mon, Mar 9, 2026 at 3:37 AM Yoav Weiss (@Shopify) >> <[email protected]> wrote: >> > >> > >> > >> > On Friday, March 6, 2026 at 6:42:41 PM UTC+1 Ian Kilpatrick wrote: >> > >> > >> > >> > On Fri, Mar 6, 2026 at 9:38 AM Ian Kilpatrick <[email protected]> >> wrote: >> > >> > Hmm... this is pretty fragile, e.g. you are missing the interleaving >> that occurs for anchor-positioning for example. >> > >> https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/css/style_engine.cc;l=3896;drc=4ae3a738cbcbfb87d2bf747e530650484e448361;bpv=1;bpt=1 >> > >> > >> > Fair. Does that mean that these style and layout calcs are not >> accounted for in the current probes? are they accounted from in the current >> LoAF implementation? >> >> Currently, LoAF cares about two things: >> - The "lifecycle" style-and-layout timestamp, which is a well defined >> time within the rendering cycle, regardless of whether more >> style/layout happens afterwards. >> - Forced style and layout, as one bucket, when called from a JS method >> that needs a synchronous result that depends on up to date values. >> >> Where I would draw the line between style and layout depends on >> whether the methods would be called for `getComputedStyle()` or only >> if a measurement like `offsetLeft` is required. >> I don't know what the answer for that when anchor position fallbacks are >> used. >> > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAJn%3DMYZyC5VOqhohott4an7fRmu4s%3DFv5WVB_OafsP6DSX%3DX1Q%40mail.gmail.com.
