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Reserve space for ads
Reserving adequate space on your page for ads is key to
minimizing layout shift. This example demonstrates various
approaches to reserving space and their effects on layout stability.
No space reserved: No dimensions are specified for the ad slot
container. The container starts out collapsed and expands when an ad fills,
causing a user-visible layout shift.
Space reserved: Dimensions are specified for the ad slot container. The
container always occupies a constant amount of space on the page, so the
layout does not shift. Blank space is visible prior to an ad being loaded.
Space reserved with placeholder: Dimensions are specified for the ad
slot container. The container occupies a constant amount of space on the
page, so the layout does not shift. CSS is used to style the empty container
to avoid blank space being visible prior to an ad being loaded.