B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
0
0 -- cumulative layout shift median for E-commerce websites (mobile benchmark) (2026)
Across 1,566 e-commerce websites in a mobile benchmark, the median Cumulative Layout Shift (CLS) is 0.04.
- Bimodal distribution where most sites are fine and failing sites fail badly
Attribution:
View source
Lighthouse Research Team
Last verified:
·
How we verify data →
Source verified
Evidence graded
Value
0
Unit
Score
Data Vintage
2026
Entity
Sample Size
1,566
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
95
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Iron-Out
Primary
Tier A
https://www.iron-out.io/blog/what-is-cumulative-layout-shift-cls/ ↗
Source Article
Cumulative Layout Shift (CLS): causes and fixes
Cumulative Layout Shift (CLS): Stop losing customers to jumpy layouts
Your user goes to tap "Buy Now" but a banner loads late and pushes the button down. They accidentally hit "Cancel" instead. This happens 800 times a day on your site. You're bleeding revenue to layout shifts.
What is CLS (and why …
Original Research
Iron-Out
· Original study ↗
Methodology
Mobile benchmark of 1,566 e-commerce sites conducted by Iron-Out; bimodal distribution noted
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
E-commerce websites (mobile benchmark): 0 cumulative layout shift median. Source: Iron-Out (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/median-cls-ecommerce-mobile-2026
HTML Embed
<blockquote cite="https://lighthousedata.io/data/median-cls-ecommerce-mobile-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>0</strong> -- cumulative layout shift median for E-commerce websites (mobile benchmark)<br><small>Source: Iron-Out (2026) · <a href="https://lighthousedata.io/data/median-cls-ecommerce-mobile-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
Share
Use this data in your work
Copy the citation, embed the widget, or explore thousands more verified marketing statistics -- all free.