Layout stability across the web

Google's CLS audit, averaged — a rendering metric, not an agentic one. It has gone up since May 2026, and again last month. Both steps clear their margin.

Excellent88.1%

Layout stability in September 2026

What the Layout stability in September 2026 is, and how it is measured

Measured on 158,178 pages, 100.0% of which carried the agentic category, with a confidence margin of ±0.13.

▲ +0.5

87.0%88.1%

Layout stability, May 2026 to September 2026, one measurement a month. The last step was a real rise.

What this measures

Lighthouse audit: cumulative-layout-shift

Cumulative Layout Shift, averaged rather than counted. It is a NUMERIC metric, so there is no pass or fail to count — measuring it as binary returned zero measurements, which is how we found out. It is here as evidence and not as a dimension: a rendering metric of a different kind from every other audit in the category, carrying half its weight.

Who moved

How to read these figures

Every figure here comes from a sample, not from counting every site — so it carries a margin: how much it could move if we had happened to sample different pages. A figure measured on a thousand pages has a wide margin; one measured on a hundred thousand has a narrow one. It matters for one thing: two figures that differ by less than the wider of their margins are not one above the other, they are tied. That is why nothing here has a position number.

How many actually moved

1 of the 1 segments measured on both months moved by more than their margin. The other 0 did not move: their difference is smaller than this sample can resolve. All of them are in the table below.

Segment	August 2026	September 2026	Movement
All sites	87.6%	88.1%	▲ +0.5

From Omitsis, who publish this census

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