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Update LCP changelog to note animations is only for UKM/CrUX

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Change-Id: I1a0d7358b15223c9643a931615d788bb74c1c666
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6377324
Commit-Queue: Barry Pollard <barrypollard@chromium.org>
Reviewed-by: Michal Mocny <mmocny@chromium.org>
Reviewed-by: Annie Sullivan <sullivan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1435544}
This commit is contained in:
Barry Pollard
2025-03-20 10:41:25 -07:00
committed by Chromium LUCI CQ
parent 795d38e58b
commit 27c7fe16af
1 changed files with 5 additions and 0 deletions

5
docs/speed/metrics_changelog/2023_08_lcp.md

@ -20,6 +20,7 @@ first frame of the animation is displayed, if the image becomes an LCP
candidate.
## How does this affect a site's metrics?
Pages with large auto-playing videos should start seeing that video used as the
LCP element. LCP scores may improve or regress on those pages, depending on what
element is currently being chosen as LCP.
@ -27,6 +28,10 @@ element is currently being chosen as LCP.
Pages with large animated images will likely see LCP scores improve, as the
image will be reported with an earlier timestamp than before.
Note for now, this only affects UKM (and so CrUX) reporting of LCP and does not
affect PerformanceObserver observations as measured in JavaScript.
## When were users affected?
This change was launched to Chrome users starting on roughly 2023-08-22, to be
rolled out to existing Chrome 116+ installs over a 14 day period.