Cumulative Layout Shift Changelog

This is a list of changes to Cumulative Layout Shift.

• Chrome 145
  • Metric definition improvement: Layout Instability attribution reports in CSS pixels
  • Metric definition improvement: Sort LayoutShift.sources array by per-source impact area
• Chrome 118
  • Implementation optimizations: Image loading prioritizations
• Chrome 116
  • Implementation optimizations: Optimizing image load scheduling
• Chrome 98
  • Metric definition improvement: Record CLS value at the first OnHidden in addition to tab close in UKM
• Chrome 97
  • Implementation optimizations: BFCache
• Chrome 93
  • Metric definition improvement: Bug fix involving scroll anchoring
  • Metric definition improvement: Ignore layout shift while dragging or resizing elements with a mouse
• Chrome 91
  • Metric definition improvement: Cumulative Layout Shift uses max session window
• Chrome 90
  • Metric definition improvement: Bug fixes involving changes to transform, effect, clip or position
  • Metric definition improvement: Consider transform change countering layout shift
  • Metric definition improvement: Ignore layout shift for more invisible elements
  • Metric definition improvement: Ignore inline direction shift moving from/to out of view
  • Metric definition improvement: Improvement for shift with counterscroll
• Chrome 89
  • Metric definition improvement: Ignore layout shift under opacity:0
  • Metric definition improvement: Clip layout shift rect by visual viewport
• Chrome 88
  • Metric definition improvement: Cumulative layout shift properly detects shifts of fixed position elements
  • Metric definition improvement: Cumulative layout shift properly detects shifts of descendents of a sticky element
  • Metric definition improvement: no penalty for content-visibility: auto content
  • Metric definition improvement: Ignore layout shift when visibility:hidden becomes visible
• Chrome 87
  • Metric definition improvement: Fix problem in Cumulative Layout shift calculation of impact region
  • Metric definition improvement: Cumulative Layout Shift properly handles clipping of elements styled contain:paint
• Chrome 86
  • Metric definition changes and bug: Cumulative Layout Shift score changes and regressions in impact region calculation
• Chrome 85
  • Metric definition improvement: Cumulative Layout Shift ignores layout shifts from video slider thumb
• Chrome 79
  • Metric is elevated to stable; changes in metric definition will be reported in this log.
• Chrome 77
  • Metric exposed via API: Cumulative Layout Shift available via Layout Instability API