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Document effect of a bugfix on CLS

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The bugfix is:
https://chromium-review.googlesource.com/c/chromium/src/+/2586969

Bug: 1141739

Change-Id: I8056b71d60442f53ab52d62066e152f76ed02db0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2615305
Reviewed-by: Annie Sullivan <sullivan@chromium.org>
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841175}
This commit is contained in:
Chris Harrelson
2021-01-07 20:45:18 +00:00
committed by Chromium LUCI CQ
parent 82efa8a309
commit 68d4c690e0
1 changed files with 7 additions and 0 deletions

7
docs/speed/metrics_changelog/2020_11_cls.md

@ -61,6 +61,13 @@ their scores.
Sites using visibility:hidden to hide layout changes may see a decrease in
their Cumulative Layout Shift scores.
### Fixed bug when recording paint offset translation deltas
A bug was introduced in Chrome 86 in which Cumulative Layout Shift was measured
incorrectly for certain cases involving nested out-of-flow elements
(absolute-position or fixed-position). This caused reported shifts even in
some cases where there was not actually a shift.
## When were users affected?
Chrome 88 is currently scheduled to be released the week of January 19, 2021.