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mailto is a Uniform Resource Identifier (URI) scheme for email addresses.It is used to produce hyperlinks on websites that allow users to send an email to a specific address directly from an HTML document, without having to copy it and entering it into an email client.
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. In 2013, because the W3C HTML Working Group failed to find someone to serve as an editor for the Microdata HTML specification, its development was terminated with a 'Note'.
In 2018 a vulnerability of the HTML processing of many common email clients was disclosed, in which decrypted text of PGP or S/MIME encrypted email parts can be caused to be sent as an attribute to an external image address, if the external image is requested. This vulnerability was present in Thunderbird, macOS Mail, Outlook, and later, Gmail ...
In SGML, HTML and XML documents, the logical constructs known as character data and attribute values consist of sequences of characters, in which each character can manifest directly (representing itself), or can be represented by a series of characters called a character reference, of which there are two types: a numeric character reference and a character entity reference.
If a web server responds with Cache-Control: no-cache then a web browser or other caching system (intermediate proxies) must not use the response to satisfy subsequent requests without first checking with the originating server (this process is called validation). This header field is part of HTTP version 1.1, and is ignored by some caches and ...
Web document markup languages frequently use URI references to point to other resources, such as external documents or specific portions of the same logical document: [13]: §4.4 in HTML, the value of the src attribute of the img element provides a URI reference, as does the value of the href attribute of the a or link element;
Web pages authored using HyperText Markup Language may contain multilingual text represented with the Unicode universal character set.Key to the relationship between Unicode and HTML is the relationship between the "document character set", which defines the set of characters that may be present in an HTML document and assigns numbers to them, and the "external character encoding", or "charset ...
The media type part may include one or more parameters, in the format attribute=value, separated by semicolons (;) . A common media type parameter is charset, specifying the character set of the media type, where the value is from the IANA list of character set names. [6]