The OpenSearch description format can be used to describe the web interface of a search engine. This allows a website to describe a search engine for itself, so that a browser or other client application can use that search engine. OpenSearch is supported by (at least) Firefox, Edge, Safari, and Chrome. (See Reference Material for links to other browsers' documentation.)... (You can generate a data: URL from an icon file...receive no indication. In general, behavior varies among browsers...