knowledge/technology/internet/Data URLs.md

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https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URLs concept

Data URLs

Data URLs, URLs prefixed with the data: scheme, allow content creators to embed small files inline in documents.

Syntax

Data URLs are composed of four parts: a prefix (data:), a MIME-type indicating the type of data, an optional base64 token if non-textual, and the data itself:
data:[<mediatype>][;base64],<data>

The mediatype is a MIME type string, such as 'image/jpeg' for a JPEG image file. If omitted, defaults to text/plain;charset=US-ASCII

The image below is actually a data url:
image