Documentation

HTML Purifier has documentation for all types of people. Here is an index of all of them.

End-user

End-user documentation that contains articles, tutorials and useful information for casual developers using HTML Purifier.

IDs: Explains various methods for allowing IDs in documents safely.
Embedding YouTube videos: Explains how to safely allow the embedding of flash from trusted sites.
Speeding up HTML Purifier: Explains how to speed up HTML Purifier through caching or inbound filtering.
UTF-8: The Secret of Character Encoding: Describes the rationale for using UTF-8, the ramifications otherwise, and how to make the switch.

Developer documentation detailing code issues, roadmaps and project conventions.

Implementation Progress: Tables detailing HTML element and CSS property implementation coverage.
Naming Conventions: Defines class naming conventions.
Optimization: Discusses possible methods of optimizing HTML Purifier.
Advanced API: Functional specification for HTML Purifier's advanced API for defining custom filtering behavior.

Proposed features, as well as the associated rambling to get a clear objective in place before attempted implementation.

Miscellaneous essays, research pieces and other reference type material that may not directly discuss HTML Purifier.

Plaintext documents that are more for use by active developers of the code. They may be upgraded to HTML files or stay as TXT scratchpads.

Type	Name	Description
End-user	Overview	High level overview of the general control flow (mostly obsolete).
End-user	Security	Common security issues that may still arise (half-baked).
Development	Code Quality Issues	Enumerates code quality issues and places that need to be refactored.
Proposal	Filter levels	Outlines details of projected configurable level of filtering.
Proposal	Language	Specification of I18N for error messages derived from MediaWiki (half-baked).
Proposal	New directives	Assorted configuration options that could be implemented.
Reference	Loose vs.Strict	Differences between HTML Strict and Transitional versions.
Reference	Proprietary tags	List of vendor-specific tags we may want to transform to W3C compliant markup.
Reference	Strictness	Short essay on how loose definition isn't really loose.
Reference	XHTML 1.1	What we'd have to do to support XHTML 1.1.
Reference	WHATWG	How WHATWG plays into what we need to do.

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