Web badge

A web badge is a small image used on websites to promote web standards, products used in the creation of a web page or product, to indicate a specific content license that is applied to the content or design of a website, or to comply with an application's terms of service.

A common-usage standard for web badges are 88x31 pixel and 80x15 pixel images typically in GIF or PNG image format composed of a small graphic to the left with text on the right. Web badges may however come in any size or configuration.

Standard dimensions:

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Wikipedia