Myth: chase a perfect 0.00 CLS score

Myth: chase a perfect 0.00 CLS score

The "0.00 CLS or bust" crowd reserves dead pixel space for every slot. Often a revenue leak.

What it does — fixed min-heights on ad containers stop layout shift.
Setup effort — 2/5.
The correction — Google's CWV threshold is 0.1, not 0. Reserving full height for a slot that sometimes goes unfilled bakes in permanent empty space, dropping your effective content-to-ad density and your collapse-on-no-fill revenue. The goal is CLS < 0.1 with collapsible fallbacks, not zero.
RPM lift seen — collapse-on-unfill + 0.05 CLS beat rigid 0.00 by 4-7% on pages with patchy fill.
Pros — keeps you green on CWV.
Cons — needs careful collapse animation to avoid shift.

Lift: ★★★☆☆ — Risk: ★★☆☆☆
Best for: international traffic with spotty fill. Skip the obsession if your fill is 95%+.