Comments (3)
skobes-chromium
commented on July 30, 2024
Having an upper bound is a good idea. We actually do limit the CLS score to 10.0 when we report it to UKM (data source for the Chrome User Experience Report). We could impose a similar limit for the Web Perf API. Differentiating beyond 10.0 is probably not useful.
from layout-instability.
mmocny
commented on July 30, 2024
I believe we can now close this, since we have published guidelines on Good, Needs Improvement, and Bad CLS scores.
from layout-instability.
npm1
commented on July 30, 2024
I think we could add an example with a diagram showing ~half the viewport shifting and explaining what the score would be in that case.
from layout-instability.
Related Issues (20)
- CumulativeLayoutShift as WPT custom metric empty HOT 1
- Update CLS to window-based
- Specify layout shifts during drag HOT 2
- Explain expectations for content which shifts while fully obscured by other content (i.e. covered by a fixed position z-index overlay)
- Resolve confusion from equal previous/current rects
- Input Exclusion (lastInputTimestamp and hadRecentInput) should include certain interactions with Browser UI. HOT 1
- The definition of DCLS and CLS (non-normative) should mention ignoring shifts with hadRecentInput: True
- Broken references in Layout Instability API
- Clarify value of entry.name: empty string or "layout-shift"
- Clarify Input Exclusion and interactions across iframes
- Margin Collapsing can cause not-visible shifts to elements
- Timeout on CLS evaluation HOT 2
- Clarification about Hover causing layout shift HOT 2
- `content-visibility: auto;` makes CLS go bananas HOT 2
- Consider excluding user-scroll + scroll-anchor in the same frame from being penalized HOT 1
- What events trigger LayoutShift Performance Callback? HOT 2
- Starting point shift with countering transform change should be ignored HOT 1
- Change events should also trigger hadRecentInput
- ignore inline-direction shift in/out of view
- Case of sticky sidebars changing from absolute to fixed HOT 1
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