Specifying a background color as a fallback for a background image is an example of a shim.

Name: Specifying a background color as a fallback for a background image is an example of a shim.
Brand: Quizplus
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Quizplus · Accepted Answer

Specifying a background color as a fallback for a background image is an example of a progressive enhancement technique, not a shim. A shim is a piece of code used to provide modern functionality on older browsers that do not support it natively.

Specifying a Background Color as a Fallback for a Background