AI & the web
Cumulative Layout Shift
A metric measuring unexpected movement of visible page elements.
In everyday use
A late-loading image pushes a button just before someone taps it.
What to keep in mind
Reserve space for media; intentional interaction changes are treated differently.
Also searched as: CLS
Further reading
Original explanation and example by Perspectism. Further reading may cover the wider subject, rather than this exact wording. Edition updated 7 October 2026.
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