About this specification

This specification is like no other — it has been processed with you, the humble web developer, in mind.

The focus of this specification is readability and ease of access. Unlike the full HTML Standard, this "developer's edition" removes information that only browser vendors need know. It is automatically produced from the full specification by our build tooling, and thus always in sync with the latest developments in HTML.

To read about its conception, construction, and future, read the original press release, and the blog post about its relaunch.

Finally, feel free to contribute on GitHub to make this edition better for everyone!

  1. References


All references are normative unless marked "Non-normative".

Augmented BNF for Syntax Specifications: ABNF, D. Crocker, P. Overell. IETF.
The 'about' URI scheme, S. Moonesamy. IETF.
(Non-normative) APNG Specification. S. Parmenter, V. Vukicevic, A. Smith. Mozilla.
Accessible Rich Internet Applications (WAI-ARIA), J. Diggs, J. Craig, S. McCarron, M. Cooper. W3C.
(Non-normative) The Atom Syndication Format, M. Nottingham, R. Sayre. IETF.
(Non-normative) Battery Status API, A. Kostiainen, M. Lamouri. W3C.
Tags for Identifying Languages; Matching of Language Tags, A. Phillips, M. Davis. IETF.
UAX #9: Unicode Bidirectional Algorithm, M. Davis. Unicode Consortium.
(Non-normative) Character Model for the World Wide Web 1.0: Fundamentals, M. Dürst, F. Yergeau, R. Ishida, M. Wolf, T. Texin. W3C.
Compositing and Blending, R. Cabanier, N. Andronikos. W3C.
HTTP State Management Mechanism, A. Barth. IETF.
Content Security Policy, M. West, D. Veditz. W3C.
Cascading Style Sheets Level 2 Revision 2, B. Bos, T. Çelik, I. Hickson, H. Lie. W3C.
CSS Style Attributes, T. Çelik, E. Etemad. W3C.
CSS Backgrounds and Borders , B. Bos, E. Etemad, B. Kemper. W3C.
CSS Cascading and Inheritance Level 4, E. Etemad, T. Atkins. W3C.
CSS Color Module Level 3, T. Çelik, C. Lilley, L. Baron. W3C.
CSS Display, T. Atkins, E. Etemad. W3C.
CSS Font Loading, T. Atkins, J. Daggett. W3C.
CSS Fonts, J. Daggett. W3C.
CSS Image Values and Replaced Content Module, E. Etemad, T. Atkins. W3C.
CSS Lists and Counters, T. Atkins. W3C.
CSS Logical Properties, R. Atanassov, E. Etemad. W3C.
Cascading Style Sheets Object Model (CSSOM), S. Pieters, G. Adams. W3C.
CSSOM View Module, S. Pieters, G. Adams. W3C.
CSS Overflow, L. Baron, F. Rivoal. W3C.
CSS Positioned Layout, R. Atanassov, A. Eicholz. W3C.
CSS3 Ruby Module, R. Ishida. W3C.
CSS3 Basic User Interface Module, T. Çelik. W3C.
CSS Syntax, T. Atkins, S. Sapin. W3C.
CSS Table, F. Remy, G. Whitworth. W3C.
CSS Text, E. Etemad, K. Ishii. W3C.
CSS3 Values and Units, H. Lie, T. Atkins, E. Etemad. W3C.
CSS Writing Modes, E. Etemad, K. Ishii. W3C.
DOM, A. van Kesteren, A. Gregor, Ms2ger. WHATWG.
DOM Parsing and Serialization, T. Leithead. W3C.
(Non-normative) The DOT Language. Graphviz.
Recommendation E.163 — Numbering Plan for The International Telephone Service, CCITT Blue Book, Fascicle II.2, pp. 128-134, November 1988.
Encoding, A. van Kesteren, J. Bell. WHATWG.
execCommand, J. Wilm, A. Gregor. W3C Editing APIs CG.
Fetch, A. van Kesteren. WHATWG.
File API, A. Ranganathan. W3C.
Filter Effects, D. Jackson, E. Dahlström, D. Schulze. W3C.
Fullscreen, A. van Kesteren, T. Çelik. WHATWG.
Geometry Interfaces Module. S. Pieters, D. Schulze, R. Cabanier. W3C.
(Non-normative) Graphics Interchange Format. CompuServe.
(Non-normative) Inter Gravissimas, A. Lilius, C. Clavius. Gregory XIII Papal Bull, February 1582.
High Resolution Time, I. Grigorik, J. Simonsen, J. Mann. W3C.
Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing, R. Fielding, J. Reschke. IETF.
Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content, R. Fielding, J. Reschke. IETF.
Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests, R. Fielding, J. Reschke. IETF.
Hypertext Transfer Protocol (HTTP/1.1): Range Requests, R. Fielding, Y. Lafon, J. Reschke. IETF.
Hypertext Transfer Protocol (HTTP/1.1): Caching, R. Fielding, M. Nottingham, J. Reschke. IETF.
Hypertext Transfer Protocol (HTTP/1.1): Authentication, R. Fielding, J. Reschke. IETF.
Permanent Message Header Field Names. IANA.
Indexed Database API, A. Alabbas, J. Bell. W3C.
Infra, A. van Kesteren, D. Denicola. WHATWG.
Intersection Observer, S. Zager. W3C.
ISO 3166: Codes for the representation of names of countries and their subdivisions. ISO.
ISO 4217: Codes for the representation of currencies and funds. ISO.
(Non-normative) ISO8601: Data elements and interchange formats — Information interchange — Representation of dates and times. ISO.
ECMAScript Language Specification. Ecma International.
Requirements for Japanese Text Layout. W3C.
JPEG File Interchange Format, E. Hamilton.
ECMAScript Internationalization API Specification. Ecma International.
The JavaScript Object Notation (JSON) Data Interchange Format, T. Bray. IETF.
(Non-normative) The 'mailto' URI scheme, M. Duerst, L. Masinter, J. Zawinski. IETF.
Mathematical Markup Language (MathML), D. Carlisle, P. Ion, R. Miner. W3C.
Media Fragments URI, R. Troncy, E. Mannens, S. Pfeiffer, D. Van Deursen. W3C.
Media Source Extensions, A. Colwell, A. Bateman, M. Watson. W3C.
Media Capture and Streams, D. Burnett, A. Bergkvist, C. Jennings, A. Narayanan. W3C.
Microformats Wiki: existing rel values. Microformats.
MIME Sniffing, G. Hemsley. WHATWG.
Mixed Content, M. West. W3C.
MNG (Multiple-image Network Graphics) Format. G. Randers-Pehrson.
Media Queries, H. Lie, T. Çelik, D. Glazman, A. van Kesteren. W3C.
(Non-normative) Gecko Plugin API Reference. Mozilla.
Autodiscovery in HTML/XHTML. In OpenSearch 1.1 Draft 4, Section 4.6.2. OpenSearch.org.
(Non-normative) The Web Origin Concept, A. Barth. IETF.
Payment Request API, A. Bateman, Z. Koch, R. McElmurry. W3C.
(Non-normative) Document management — Portable document format — Part 1: PDF. ISO.
Pingback 1.0, S. Langridge, I. Hickson.
Portable Network Graphics (PNG) Specification, D. Duce. W3C.
Pointer Events, J. Rossi, M. Brubeck, R. Byers, P. H. Lauke. W3C.
Pointer Lock, V. Scheib. W3C.
Preload, I. Grigorik. W3C.
Presentation API, M. Foltz, D. Röttsches. W3C.
Referrer Policy, J. Eisinger, E. Stark. W3C.
Resource Hints, I. Grigorik. W3C.
Domain Names - Concepts and Facilities, P. Mockapetris. IETF, November 1987.
Requirements for Internet Hosts -- Application and Support, R. Braden. IETF, October 1989.
Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types, N. Freed, N. Borenstein. IETF.
The "data" URL scheme, L. Masinter. IETF.
Internet Calendaring and Scheduling Core Object Specification (iCalendar), B. Desruisseaux. IETF.
URI Resolution Services Necessary for URN Resolution, M. Mealling, R. Daniel. IETF.
The Text/Plain Format and DelSp Parameters, R. Gellens. IETF.
Registration Procedures for Message Header Fields, G. Klyne, M. Nottingham, J. Mogul. IETF.
(Non-normative) Scripting Media Types, B. Höhrmann. IETF.
(Non-normative) MIME Type Registration for MPEG-4, Y. Lim, D. Singer. IETF.
Guidelines and Registration Procedures for URI Schemes, D. Thaler, T. Hansen, T. Hardie. IETF.
Internet Message Format, P. Resnick. IETF.
The 'Codecs' and 'Profiles' Parameters for "Bucket" Media Types, R. Gellens, D. Singer, P. Frojdh. IETF.
Use of the Content-Disposition Header Field in the Hypertext Transfer Protocol (HTTP), J. Reschke. IETF.
vCard Format Specification, S. Perreault. IETF.
The Canonical Link Relation, M. Ohye, J. Kupke. IETF.
XML Media Types, H. Thompson, C. Lilley. IETF.
Returning Values from Forms: multipart/form-data, L. Masinter. IETF.
Screen Orientation API, M. Lamouri, M. Cáceres. W3C.
Selection API, R. Niwa. W3C.
Selectors, E. Etemad, T. Çelik, D. Glazman, I. Hickson, P. Linss, J. Williams. W3C.
(Non-normative) URI Scheme for Global System for Mobile Communications (GSM) Short Message Service (SMS), E. Wilde, A. Vaha-Sipila. IETF.
IEC 61966-2-1: Multimedia systems and equipment — Colour measurement and management — Part 2-1: Colour management — Default RGB colour space — sRGB. IEC.
Subresource Integrity, D. Akhawe, F. Braun, F. Marier, J. Weinberger. W3C.
Scalable Vector Graphics (SVG) 1.1 (Second Edition), E. Dahlström, P. Dengler, A. Grasso, C. Lilley, C. McCormack, D. Schepers, J. Watt, J. Ferraiolo, J. Fujisawa, D. Jackson. W3C.
Scalable Vector Graphics (SVG) Tiny 1.2, O. Andersson, R. Berjon, E. Dahlström, A. Emmons, J. Ferraiolo, A. Grasso, V. Hardy, S. Hayman, D. Jackson, C. Lilley, C. McCormack, A. Neumann, C. Northway, A. Quint, N. Ramani, D. Schepers, A. Shellshear. W3C.
(Non-normative) Scalable Vector Graphics (SVG) 2, N. Andronikos, R. Atanassov, T. Bah, A. Bellamy-Royds, B. Birtles, B. Brinza, C. Concolato, E. Dahlström, C. Lilley, C. McCormack, D. Schepers, D. Schulze, R. Schwerdtfeger, S. Takagi, J. Watt. W3C.
Service Workers, A. Russell, J. Song, J. Archibald. W3C.
Touch Events, D. Schepers, S. Moon, M. Brubeck, A. Barstow, R. Byers. W3C.
(Non-normative) Time Zone Database. IANA.
UI Events Specification, G. Kacmarcik, T. Leithead. W3C.
The Unicode Standard. Unicode Consortium.
URL, A. van Kesteren. WHATWG.
URN Syntax, R. Moats. IETF.
(Non-normative) UTF-7: A Mail-Safe Transformation Format of Unicode, D. Goldsmith, M. Davis. IETF.
(Non-normative) UTR #36: Unicode Security Considerations, M. Davis, M. Suignard. Unicode Consortium.
(Non-normative) Web Content Accessibility Guidelines (WCAG) 2.0, B. Caldwell, M. Cooper, L. Reid, G. Vanderheiden. W3C.
(Non-normative) Web Cryptography API, M. Watson. W3C.
WebGL Specification, D. Jackson. Khronos Group.
Web IDL, C. McCormack. W3C.
Web Linking, M. Nottingham. IETF.
WebVTT, S. Pieters. W3C.
Worklets. I. Kilpatrick. W3C.
The WebSocket protocol, I. Fette, A. Melnikov. IETF.
Recommendation X.121 — International Numbering Plan for Public Data Networks, CCITT Blue Book, Fascicle VIII.3, pp. 317-332.
XFN 1.1 profile, T. Çelik, M. Mullenweg, E. Meyer. GMPG.
XMLHttpRequest, A. van Kesteren. WHATWG.
(Non-normative) Substitutions, Randall Munroe. xkcd.
Extensible Markup Language, T. Bray, J. Paoli, C. Sperberg-McQueen, E. Maler, F. Yergeau. W3C.
(Non-normative) XML Entity Definitions for Characters, D. Carlisle, P. Ion. W3C.
Namespaces in XML, T. Bray, D. Hollander, A. Layman, R. Tobin. W3C.
Associating Style Sheets with XML documents, J. Clark, S. Pieters, H. Thompson. W3C.
(Non-normative) DOM XSLTProcessor, WHATWG Wiki. WHATWG.