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Adding search engines from web pages

Firefox allows JavaScript code to install search engine plugins, and supports two search engine plugin formats: OpenSearch, and Sherlock.
Add-ons Search plugins

Microdata

Microdata is a WHATWG HTML specification used to nest metadata within existing content on web pages.[1] Search engines, web crawlers, and browsers can extract and process microdata from a web page and use it to provide a richer browsing experience for users. Search engines benefit greatly from direct access to this structured data because it allows search engines to understand the information on web pages and provide more relevant results to users. Microdata uses a supporting vocabulary to describe an item and name-value pairs to assign values to its properties. Microdata is an attempt to provide a simpler way of annotating HTML elements with machine-readable tags than the similar approaches of using RDFa and microformats.
Composing Example HTML Microdata Reference search Search SEO