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2.1.2Attributes 2.2Character and entity references 2.3Data types 2.4Document type declaration 3Semantic HTML 4Delivery Toggle Delivery subsection 4.1HTTP 4.2HTML e-mail 4.3Naming conventions 4.4HTML Application 5HTML4 variations Toggle HTML4 variations subsection 5.1SGML-based versus XML-based HTML 5.2Transitional versus strict
Portable Document Format ( PDF ), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.
In select XML editors and management systems, the images and content can be viewed as rendered, through CSS mostly. ^ Presentational content is supported through SVG and MathML markup. In select XML editors, the images can be viewed as rendered. ^ Presentational markup is deprecated as of XHTML 1.0 and no longer allowed as of XHTML 1.1
PDF/A is an ISO -standardized version of the Portable Document Format (PDF) specialized for use in the archiving and long-term preservation of electronic documents. PDF/A differs from PDF by prohibiting features unsuitable for long-term archiving, such as font linking (as opposed to font embedding) and encryption. 
An open file format is a file format for storing digital data,   defined by an openly published specification usually maintained by a standards organization, and which can be used and implemented by anyone. Open file format is licensed with open license.  For example, an open format can be implemented by both proprietary and free and ...
MHTML files use an .mhtml or .mht filename extension . The first part of the file is an e-mail header. The second part is normally HTML code. Subsequent parts are additional resources identified by their original uniform resource locators (URLs) and encoded in base64 binary-to-text encoding.
PDF was developed to share documents, including text formatting and inline images, among computer users of disparate platforms who may not have access to mutually-compatible application software.  It was created by a research and development team called Camelot,  led by Adobe's co-founder John Warnock.