Abstract

This specification defines the 5th major revision of the core language of the World Wide Web: the Hypertext Markup Language (HTML). In this version, new features are introduced to help Web application authors, new elements are introduced based on research into prevailing authoring practices, and special attention has been given to defining clear conformance criteria for user agents in an effort to improve interoperability.

Status of This document

This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current W3C publications and the most recently formally published revision of this technical report can be found in the W3C technical reports index at http://www.w3.org/TR/.

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The W3C HTML Working Group is the W3C working group responsible for this specification's progress along the W3C Recommendation track. This specification is the 29 March 2012 Working Draft.

Work on this specification is also done at the WHATWG. The W3C HTML working group actively pursues convergence with the WHATWG, as required by the W3C HTML working group charter.

This document was produced by a group operating under the 5 February 2004 W3C Patent Policy. W3C maintains a public list of any patent disclosures made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains Essential Claim(s) must disclose the information in accordance with section 6 of the W3C Patent Policy.

Table of Contents

  1. 1 Introduction
    1. 1.1 Background
    2. 1.2 Audience
    3. 1.3 Scope
    4. 1.4 History
    5. 1.5 Design notes
      1. 1.5.1 Serializability of script execution
      2. 1.5.2 Compliance with other specifications
    6. 1.6 HTML vs XHTML
    7. 1.7 Structure of this specification
      1. 1.7.1 How to read this specification
      2. 1.7.2 Typographic conventions
    8. 1.8 A quick introduction to HTML
      1. 1.8.1 Writing secure applications with HTML
      2. 1.8.2 Common pitfalls to avoid when using the scripting APIs
    9. 1.9 Conformance requirements for authors
      1. 1.9.1 Presentational markup
      2. 1.9.2 Syntax errors
      3. 1.9.3 Restrictions on content models and on attribute values
    10. 1.10 Recommended reading
  2. 2 Common infrastructure
    1. 2.1 Terminology
      1. 2.1.1 Resources
      2. 2.1.2 XML
      3. 2.1.3 DOM trees
      4. 2.1.4 Scripting
      5. 2.1.5 Plugins
      6. 2.1.6 Character encodings
    2. 2.2 Conformance requirements
      1. 2.2.1 Conformance classes
      2. 2.2.2 Dependencies
      3. 2.2.3 Extensibility
    3. 2.3 Case-sensitivity and string comparison
    4. 2.4 UTF-8
    5. 2.5 Common microsyntaxes
      1. 2.5.1 Common parser idioms
      2. 2.5.2 Boolean attributes
      3. 2.5.3 Keywords and enumerated attributes
      4. 2.5.4 Numbers
        1. 2.5.4.1 Signed integers
        2. 2.5.4.2 Non-negative integers
        3. 2.5.4.3 Floating-point numbers
        4. 2.5.4.4 Percentages and lengths
        5. 2.5.4.5 Lists of integers
        6. 2.5.4.6 Lists of dimensions
      5. 2.5.5 Dates and times
        1. 2.5.5.1 Months
        2. 2.5.5.2 Dates
        3. 2.5.5.3 Yearless dates
        4. 2.5.5.4 Times
        5. 2.5.5.5 Local dates and times
        6. 2.5.5.6 Time zones
        7. 2.5.5.7 Global dates and times
        8. 2.5.5.8 Weeks
        9. 2.5.5.9 Durations
        10. 2.5.5.10 Vaguer moments in time
      6. 2.5.6 Colors
      7. 2.5.7 Space-separated tokens
      8. 2.5.8 Comma-separated tokens
      9. 2.5.9 References
      10. 2.5.10 Media queries
    6. 2.6 URLs
      1. 2.6.1 Terminology
      2. 2.6.2 Parsing URLs
      3. 2.6.3 Resolving URLs
      4. 2.6.4 URL manipulation and creation
      5. 2.6.5 Dynamic changes to base URLs
      6. 2.6.6 Interfaces for URL manipulation
    7. 2.7 Fetching resources
      1. 2.7.1 Protocol concepts
      2. 2.7.2 Encrypted HTTP and related security concerns
      3. 2.7.3 Determining the type of a resource
      4. 2.7.4 Extracting encodings from meta elements
      5. 2.7.5 CORS settings attributes
      6. 2.7.6 CORS-enabled fetch
    8. 2.8 Common DOM interfaces
      1. 2.8.1 Reflecting content attributes in IDL attributes
      2. 2.8.2 Collections
        1. 2.8.2.1 HTMLAllCollection
        2. 2.8.2.2 HTMLFormControlsCollection
        3. 2.8.2.3 HTMLOptionsCollection
      3. 2.8.3 DOMStringMap
      4. 2.8.4 Transferable objects
      5. 2.8.5 Safe passing of structured data
      6. 2.8.6 DOM feature strings
      7. 2.8.7 Garbage collection
    9. 2.9 Namespaces
  3. 3 Semantics, structure, and APIs of HTML documents
    1. 3.1 Documents
      1. 3.1.1 Documents in the DOM
      2. 3.1.2 Security
      3. 3.1.3 Resource metadata management
      4. 3.1.4 DOM tree accessors
      5. 3.1.5 Loading XML documents
    2. 3.2 Elements
      1. 3.2.1 Semantics
      2. 3.2.2 Elements in the DOM
      3. 3.2.3 Global attributes
        1. 3.2.3.1 The id attribute
        2. 3.2.3.2 The title attribute
        3. 3.2.3.3 The lang and xml:lang attributes
        4. 3.2.3.4 The translate attribute
        5. 3.2.3.5 The xml:base attribute (XML only)
        6. 3.2.3.6 The dir attribute
        7. 3.2.3.7 The class attribute
        8. 3.2.3.8 The style attribute
        9. 3.2.3.9 Embedding custom non-visible data with the data-* attributes
      4. 3.2.4 Element definitions
        1. 3.2.4.1 Attributes
      5. 3.2.5 Content models
        1. 3.2.5.1 Kinds of content
          1. 3.2.5.1.1 Metadata content
          2. 3.2.5.1.2 Flow content
          3. 3.2.5.1.3 Sectioning content
          4. 3.2.5.1.4 Heading content
          5. 3.2.5.1.5 Phrasing content
          6. 3.2.5.1.6 Embedded content
          7. 3.2.5.1.7 Interactive content
          8. 3.2.5.1.8 Palpable content
        2. 3.2.5.2 Transparent content models
        3. 3.2.5.3 Paragraphs
      6. 3.2.6 Requirements relating to bidirectional-algorithm formatting characters
      7. 3.2.7 WAI-ARIA
    3. 3.3 Interactions with XPath and XSLT
    4. 3.4 Dynamic markup insertion
      1. 3.4.1 Opening the input stream
      2. 3.4.2 Closing the input stream
      3. 3.4.3 document.write()
      4. 3.4.4 document.writeln()
  4. 4 The elements of HTML
    1. 4.1 The root element
      1. 4.1.1 The html element
    2. 4.2 Document metadata
      1. 4.2.1 The head element
      2. 4.2.2 The title element
      3. 4.2.3 The base element
      4. 4.2.4 The link element
      5. 4.2.5 The meta element
        1. 4.2.5.1 Standard metadata names
        2. 4.2.5.2 Other metadata names
        3. 4.2.5.3 Pragma directives
        4. 4.2.5.4 Other pragma directives
        5. 4.2.5.5 Specifying the document's character encoding
      6. 4.2.6 The style element
      7. 4.2.7 Styling
    3. 4.3 Scripting
      1. 4.3.1 The script element
        1. 4.3.1.1 Scripting languages
        2. 4.3.1.2 Restrictions for contents of script elements
        3. 4.3.1.3 Inline documentation for external scripts
        4. 4.3.1.4 Interaction of script elements and XSLT
      2. 4.3.2 The noscript element
    4. 4.4 Sections
      1. 4.4.1 The body element
      2. 4.4.2 The section element
      3. 4.4.3 The nav element
      4. 4.4.4 The article element
      5. 4.4.5 The aside element
      6. 4.4.6 The h1, h2, h3, h4, h5, and h6 elements
      7. 4.4.7 The hgroup element
      8. 4.4.8 The header element
      9. 4.4.9 The footer element
      10. 4.4.10 The address element
      11. 4.4.11 Headings and sections
        1. 4.4.11.1 Creating an outline
    5. 4.5 Grouping content
      1. 4.5.1 The p element
      2. 4.5.2 The hr element
      3. 4.5.3 The pre element
      4. 4.5.4 The blockquote element
      5. 4.5.5 The ol element
      6. 4.5.6 The ul element
      7. 4.5.7 The li element
      8. 4.5.8 The dl element
      9. 4.5.9 The dt element
      10. 4.5.10 The dd element
      11. 4.5.11 The figure element
      12. 4.5.12 The figcaption element
      13. 4.5.13 The div element
    6. 4.6 Text-level semantics
      1. 4.6.1 The a element
      2. 4.6.2 The em element
      3. 4.6.3 The strong element
      4. 4.6.4 The small element
      5. 4.6.5 The s element
      6. 4.6.6 The cite element
      7. 4.6.7 The q element
      8. 4.6.8 The dfn element
      9. 4.6.9 The abbr element
      10. 4.6.10 The time element
      11. 4.6.11 The code element
      12. 4.6.12 The var element
      13. 4.6.13 The samp element
      14. 4.6.14 The kbd element
      15. 4.6.15 The sub and sup elements
      16. 4.6.16 The i element
      17. 4.6.17 The b element
      18. 4.6.18 The u element
      19. 4.6.19 The mark element
      20. 4.6.20 The ruby element
      21. 4.6.21 The rt element
      22. 4.6.22 The rp element
      23. 4.6.23 The bdi element
      24. 4.6.24 The bdo element
      25. 4.6.25 The span element
      26. 4.6.26 The br element
      27. 4.6.27 The wbr element
      28. 4.6.28 Usage summary
    7. 4.7 Edits
      1. 4.7.1 The ins element
      2. 4.7.2 The del element
      3. 4.7.3 Attributes common to ins and del elements
      4. 4.7.4 Edits and paragraphs
      5. 4.7.5 Edits and lists
      6. 4.7.6 Edits and tables
    8. 4.8 Embedded content
      1. 4.8.1 The img element
        1. 4.8.1.1 Requirements for providing text to act as an alternative for images
          1. 4.8.1.1.1 General guidelines
          2. 4.8.1.1.2 A link or button containing nothing but the image
          3. 4.8.1.1.3 A phrase or paragraph with an alternative graphical representation: charts, diagrams, graphs, maps, illustrations
          4. 4.8.1.1.4 A short phrase or label with an alternative graphical representation: icons, logos
          5. 4.8.1.1.5 Text that has been rendered to a graphic for typographical effect
          6. 4.8.1.1.6 A graphical representation of some of the surrounding text
          7. 4.8.1.1.7 A purely decorative image that doesn't add any information
          8. 4.8.1.1.8 A group of images that form a single larger picture with no links
          9. 4.8.1.1.9 A group of images that form a single larger picture with links
          10. 4.8.1.1.10 A key part of the content
          11. 4.8.1.1.11 An image not intended for the user
          12. 4.8.1.1.12 Guidance for markup generators
          13. 4.8.1.1.13 Guidance for conformance checkers
      2. 4.8.2 The iframe element
      3. 4.8.3 The embed element
      4. 4.8.4 The object element
      5. 4.8.5 The param element
      6. 4.8.6 The video element
      7. 4.8.7 The audio element
      8. 4.8.8 The source element
      9. 4.8.9 The track element
      10. 4.8.10 Media elements
        1. 4.8.10.1 Error codes
        2. 4.8.10.2 Location of the media resource
        3. 4.8.10.3 MIME types
        4. 4.8.10.4 Network states
        5. 4.8.10.5 Loading the media resource
        6. 4.8.10.6 Offsets into the media resource
        7. 4.8.10.7 Ready states
        8. 4.8.10.8 Playing the media resource
        9. 4.8.10.9 Seeking
        10. 4.8.10.10 Media resources with multiple media tracks
          1. 4.8.10.10.1 AudioTrackList and VideoTrackList objects
          2. 4.8.10.10.2 Selecting specific audio and video tracks declaratively
        11. 4.8.10.11 Synchronising multiple media elements
          1. 4.8.10.11.1 Introduction
          2. 4.8.10.11.2 Media controllers
          3. 4.8.10.11.3 Assigning a media controller declaratively
        12. 4.8.10.12 Timed text tracks
          1. 4.8.10.12.1 Text track model
          2. 4.8.10.12.2 Sourcing in-band text tracks
          3. 4.8.10.12.3 Sourcing out-of-band text tracks
          4. 4.8.10.12.4 Guidelines for exposing cues in various formats as text track cues
          5. 4.8.10.12.5 Text track API
          6. 4.8.10.12.6 Text tracks describing chapters
          7. 4.8.10.12.7 Event definitions
        13. 4.8.10.13 User interface
        14. 4.8.10.14 Time ranges
        15. 4.8.10.15 Event definitions
        16. 4.8.10.16 Event summary
        17. 4.8.10.17 Security and privacy considerations
        18. 4.8.10.18 Best practices for authors using media elements
        19. 4.8.10.19 Best practices for implementors of media elements
      11. 4.8.11 The canvas element
        1. 4.8.11.1 Color spaces and color correction
        2. 4.8.11.2 Security with canvas elements
      12. 4.8.12 The map element
      13. 4.8.13 The area element
      14. 4.8.14 Image maps
        1. 4.8.14.1 Authoring
        2. 4.8.14.2 Processing model
      15. 4.8.15 MathML
      16. 4.8.16 SVG
      17. 4.8.17 Dimension attributes
    9. 4.9 Tabular data
      1. 4.9.1 The table element
        1. 4.9.1.1 Techniques for describing tables
        2. 4.9.1.2 Techniques for table layout
      2. 4.9.2 The caption element
      3. 4.9.3 The colgroup element
      4. 4.9.4 The col element
      5. 4.9.5 The tbody element
      6. 4.9.6 The thead element
      7. 4.9.7 The tfoot element
      8. 4.9.8 The tr element
      9. 4.9.9 The td element
      10. 4.9.10 The th element
      11. 4.9.11 Attributes common to td and th elements
      12. 4.9.12 Processing model
        1. 4.9.12.1 Forming a table
        2. 4.9.12.2 Forming relationships between data cells and header cells
      13. 4.9.13 Examples
    10. 4.10 Forms
      1. 4.10.1 Introduction
        1. 4.10.1.1 Writing a form's user interface
        2. 4.10.1.2 Implementing the server-side processing for a form
        3. 4.10.1.3 Configuring a form to communicate with a server
        4. 4.10.1.4 Client-side form validation
        5. 4.10.1.5 Date, time, and number formats
      2. 4.10.2 Categories
      3. 4.10.3 The form element
      4. 4.10.4 The fieldset element
      5. 4.10.5 The legend element
      6. 4.10.6 The label element
      7. 4.10.7 The input element
        1. 4.10.7.1 States of the type attribute
          1. 4.10.7.1.1 Hidden state (type=hidden)
          2. 4.10.7.1.2 Text (type=text) state and Search state (type=search)
          3. 4.10.7.1.3 Telephone state (type=tel)
          4. 4.10.7.1.4 URL state (type=url)
          5. 4.10.7.1.5 E-mail state (type=email)
          6. 4.10.7.1.6 Password state (type=password)
          7. 4.10.7.1.7 Date and Time state (type=datetime)
          8. 4.10.7.1.8 Date state (type=date)
          9. 4.10.7.1.9 Month state (type=month)
          10. 4.10.7.1.10 Week state (type=week)
          11. 4.10.7.1.11 Time state (type=time)
          12. 4.10.7.1.12 Local Date and Time state (type=datetime-local)
          13. 4.10.7.1.13 Number state (type=number)
          14. 4.10.7.1.14 Range state (type=range)
          15. 4.10.7.1.15 Color state (type=color)
          16. 4.10.7.1.16 Checkbox state (type=checkbox)
          17. 4.10.7.1.17 Radio Button state (type=radio)
          18. 4.10.7.1.18 File Upload state (type=file)
          19. 4.10.7.1.19 Submit Button state (type=submit)
          20. 4.10.7.1.20 Image Button state (type=image)
          21. 4.10.7.1.21 Reset Button state (type=reset)
          22. 4.10.7.1.22 Button state (type=button)
        2. 4.10.7.2 Implemention notes regarding localization of form controls
        3. 4.10.7.3 Common input element attributes
          1. 4.10.7.3.1 The autocomplete attribute
          2. 4.10.7.3.2 The dirname attribute
          3. 4.10.7.3.3 The list attribute
          4. 4.10.7.3.4 The readonly attribute
          5. 4.10.7.3.5 The size attribute
          6. 4.10.7.3.6 The required attribute
          7. 4.10.7.3.7 The multiple attribute
          8. 4.10.7.3.8 The maxlength attribute
          9. 4.10.7.3.9 The pattern attribute
          10. 4.10.7.3.10 The min and max attributes
          11. 4.10.7.3.11 The step attribute
          12. 4.10.7.3.12 The placeholder attribute
        4. 4.10.7.4 Common input element APIs
        5. 4.10.7.5 Common event behaviors
      8. 4.10.8 The button element
      9. 4.10.9 The select element
      10. 4.10.10 The datalist element
      11. 4.10.11 The optgroup element
      12. 4.10.12 The option element
      13. 4.10.13 The textarea element
      14. 4.10.14 The keygen element
      15. 4.10.15 The output element
      16. 4.10.16 The progress element
      17. 4.10.17 The meter element
      18. 4.10.18 Association of controls and forms
      19. 4.10.19 Attributes common to form controls
        1. 4.10.19.1 Naming form controls
        2. 4.10.19.2 Enabling and disabling form controls
        3. 4.10.19.3 A form control's value
        4. 4.10.19.4 Autofocusing a form control
        5. 4.10.19.5 Limiting user input length
        6. 4.10.19.6 Form submission
        7. 4.10.19.7 Submitting element directionality
      20. 4.10.20 APIs for the text field selections
      21. 4.10.21 Constraints
        1. 4.10.21.1 Definitions
        2. 4.10.21.2 Constraint validation
        3. 4.10.21.3 The constraint validation API
        4. 4.10.21.4 Security
      22. 4.10.22 Form submission
        1. 4.10.22.1 Introduction
        2. 4.10.22.2 Implicit submission
        3. 4.10.22.3 Form submission algorithm
        4. 4.10.22.4 Constructing the form data set
        5. 4.10.22.5 URL-encoded form data
        6. 4.10.22.6 Multipart form data
        7. 4.10.22.7 Plain text form data
      23. 4.10.23 Resetting a form
    11. 4.11 Interactive elements
      1. 4.11.1 The details element
      2. 4.11.2 The summary element
      3. 4.11.3 The command element
      4. 4.11.4 The menu element
        1. 4.11.4.1 Introduction
        2. 4.11.4.2 Building menus and toolbars
        3. 4.11.4.3 Context menus
        4. 4.11.4.4 Toolbars
      5. 4.11.5 Commands
        1. 4.11.5.1 Using the a element to define a command
        2. 4.11.5.2 Using the button element to define a command
        3. 4.11.5.3 Using the input element to define a command
        4. 4.11.5.4 Using the option element to define a command
        5. 4.11.5.5 Using the command element to define a command
        6. 4.11.5.6 Using the command attribute on command elements to define a command indirectly
        7. 4.11.5.7 Using the accesskey attribute on a label element to define a command
        8. 4.11.5.8 Using the accesskey attribute on a legend element to define a command
        9. 4.11.5.9 Using the accesskey attribute to define a command on other elements
    12. 4.12 Links
      1. 4.12.1 Introduction
      2. 4.12.2 Links created by a and area elements
      3. 4.12.3 Following hyperlinks
      4. 4.12.4 Link types
        1. 4.12.4.1 Link type "alternate"
        2. 4.12.4.2 Link type "author"
        3. 4.12.4.3 Link type "bookmark"
        4. 4.12.4.4 Link type "help"
        5. 4.12.4.5 Link type "icon"
        6. 4.12.4.6 Link type "license"
        7. 4.12.4.7 Link type "nofollow"
        8. 4.12.4.8 Link type "noreferrer"
        9. 4.12.4.9 Link type "prefetch"
        10. 4.12.4.10 Link type "search"
        11. 4.12.4.11 Link type "stylesheet"
        12. 4.12.4.12 Link type "tag"
        13. 4.12.4.13 Sequential link types
          1. 4.12.4.13.1 Link type "next"
          2. 4.12.4.13.2 Link type "prev"
        14. 4.12.4.14 Other link types
    13. 4.13 Common idioms without dedicated elements
      1. 4.13.1 The main part of the content
      2. 4.13.2 Bread crumb navigation
      3. 4.13.3 Tag clouds
      4. 4.13.4 Conversations
      5. 4.13.5 Footnotes
    14. 4.14 Matching HTML elements using selectors
      1. 4.14.1 Case-sensitivity
      2. 4.14.2 Pseudo-classes
  5. 5 Loading Web pages
    1. 5.1 Browsing contexts
      1. 5.1.1 Nested browsing contexts
        1. 5.1.1.1 Navigating nested browsing contexts in the DOM
      2. 5.1.2 Auxiliary browsing contexts
        1. 5.1.2.1 Navigating auxiliary browsing contexts in the DOM
      3. 5.1.3 Secondary browsing contexts
      4. 5.1.4 Security
      5. 5.1.5 Groupings of browsing contexts
      6. 5.1.6 Browsing context names
    2. 5.2 The Window object
      1. 5.2.1 Security
      2. 5.2.2 APIs for creating and navigating browsing contexts by name
      3. 5.2.3 Accessing other browsing contexts
      4. 5.2.4 Named access on the Window object
      5. 5.2.5 Garbage collection and browsing contexts
      6. 5.2.6 Browser interface elements
      7. 5.2.7 The WindowProxy object
    3. 5.3 Origin
      1. 5.3.1 Relaxing the same-origin restriction
    4. 5.4 Session history and navigation
      1. 5.4.1 The session history of browsing contexts
      2. 5.4.2 The History interface
      3. 5.4.3 The Location interface
        1. 5.4.3.1 Security
      4. 5.4.4 Implementation notes for session history
    5. 5.5 Browsing the Web
      1. 5.5.1 Navigating across documents
      2. 5.5.2 Page load processing model for HTML files
      3. 5.5.3 Page load processing model for XML files
      4. 5.5.4 Page load processing model for text files
      5. 5.5.5 Page load processing model for multipart/x-mixed-replace resources
      6. 5.5.6 Page load processing model for media
      7. 5.5.7 Page load processing model for content that uses plugins
      8. 5.5.8 Page load processing model for inline content that doesn't have a DOM
      9. 5.5.9 Navigating to a fragment identifier
      10. 5.5.10 History traversal
        1. 5.5.10.1 Event definitions
      11. 5.5.11 Unloading documents
        1. 5.5.11.1 Event definition
      12. 5.5.12 Aborting a document load
    6. 5.6 Offline Web applications
      1. 5.6.1 Introduction
        1. 5.6.1.1 Event summary
      2. 5.6.2 Application caches
      3. 5.6.3 The cache manifest syntax
        1. 5.6.3.1 Some sample manifests
        2. 5.6.3.2 Writing cache manifests
        3. 5.6.3.3 Parsing cache manifests
      4. 5.6.4 Downloading or updating an application cache
      5. 5.6.5 The application cache selection algorithm
      6. 5.6.6 Changes to the networking model
      7. 5.6.7 Expiring application caches
      8. 5.6.8 Disk space
      9. 5.6.9 Application cache API
      10. 5.6.10 Browser state
  6. 6 Web application APIs
    1. 6.1 Scripting
      1. 6.1.1 Introduction
      2. 6.1.2 Enabling and disabling scripting
      3. 6.1.3 Processing model
        1. 6.1.3.1 Definitions
        2. 6.1.3.2 Calling scripts
        3. 6.1.3.3 Creating scripts
        4. 6.1.3.4 Killing scripts
        5. 6.1.3.5 Runtime script errors
          1. 6.1.3.5.1 Runtime script errors in documents
      4. 6.1.4 Event loops
        1. 6.1.4.1 Definitions
        2. 6.1.4.2 Processing model
        3. 6.1.4.3 Generic task sources
      5. 6.1.5 The javascript: URL scheme
      6. 6.1.6 Events
        1. 6.1.6.1 Event handlers
        2. 6.1.6.2 Event handlers on elements, Document objects, and Window objects
        3. 6.1.6.3 Event firing
        4. 6.1.6.4 Events and the Window object
    2. 6.2 Base64 utility methods
    3. 6.3 Timers
    4. 6.4 User prompts
      1. 6.4.1 Simple dialogs
      2. 6.4.2 Printing
      3. 6.4.3 Dialogs implemented using separate documents
    5. 6.5 System state and capabilities
      1. 6.5.1 The Navigator object
        1. 6.5.1.1 Client identification
        2. 6.5.1.2 Custom scheme and content handlers
        3. 6.5.1.3 Security and privacy
        4. 6.5.1.4 Sample user interface
        5. 6.5.1.5 Manually releasing the storage mutex
      2. 6.5.2 The External interface
  7. 7 User interaction
    1. 7.1 The hidden attribute
    2. 7.2 Activation
    3. 7.3 Focus
      1. 7.3.1 Sequential focus navigation and the tabindex attribute
      2. 7.3.2 Focus management
      3. 7.3.3 Document-level focus APIs
      4. 7.3.4 Element-level focus APIs
    4. 7.4 Assigning keyboard shortcuts
      1. 7.4.1 Introduction
      2. 7.4.2 The accesskey attribute
      3. 7.4.3 Processing model
    5. 7.5 Editing
      1. 7.5.1 Making document regions editable: The contenteditable content attribute
      2. 7.5.2 Making entire documents editable: The designMode IDL attribute
      3. 7.5.3 Best practices for in-page editors
      4. 7.5.4 Editing APIs
      5. 7.5.5 Spelling and grammar checking
    6. 7.6 Drag and drop
      1. 7.6.1 Introduction
      2. 7.6.2 The drag data store
      3. 7.6.3 The DataTransfer interface
        1. 7.6.3.1 The DataTransferItemList interface
        2. 7.6.3.2 The DataTransferItem interface
      4. 7.6.4 The DragEvent interface
      5. 7.6.5 Drag-and-drop processing model
      6. 7.6.6 Events summary
      7. 7.6.7 The draggable attribute
      8. 7.6.8 The dropzone attribute
      9. 7.6.9 Security risks in the drag-and-drop model
  8. 8 The HTML syntax
    1. 8.1 Writing HTML documents
      1. 8.1.1 The DOCTYPE
      2. 8.1.2 Elements
        1. 8.1.2.1 Start tags
        2. 8.1.2.2 End tags
        3. 8.1.2.3 Attributes
        4. 8.1.2.4 Optional tags
        5. 8.1.2.5 Restrictions on content models
        6. 8.1.2.6 Restrictions on the contents of raw text and RCDATA elements
      3. 8.1.3 Text
        1. 8.1.3.1 Newlines
      4. 8.1.4 Character references
      5. 8.1.5 CDATA sections
      6. 8.1.6 Comments
    2. 8.2 Parsing HTML documents
      1. 8.2.1 Overview of the parsing model
      2. 8.2.2 The input byte stream
        1. 8.2.2.1 Determining the character encoding
        2. 8.2.2.2 Character encodings
        3. 8.2.2.3 Changing the encoding while parsing
        4. 8.2.2.4 Preprocessing the input stream
      3. 8.2.3 Parse state
        1. 8.2.3.1 The insertion mode
        2. 8.2.3.2 The stack of open elements
        3. 8.2.3.3 The list of active formatting elements
        4. 8.2.3.4 The element pointers
        5. 8.2.3.5 Other parsing state flags
      4. 8.2.4 Tokenization
        1. 8.2.4.1 Data state
        2. 8.2.4.2 Character reference in data state
        3. 8.2.4.3 RCDATA state
        4. 8.2.4.4 Character reference in RCDATA state
        5. 8.2.4.5 RAWTEXT state
        6. 8.2.4.6 Script data state
        7. 8.2.4.7 PLAINTEXT state
        8. 8.2.4.8 Tag open state
        9. 8.2.4.9 End tag open state
        10. 8.2.4.10 Tag name state
        11. 8.2.4.11 RCDATA less-than sign state
        12. 8.2.4.12 RCDATA end tag open state
        13. 8.2.4.13 RCDATA end tag name state
        14. 8.2.4.14 RAWTEXT less-than sign state
        15. 8.2.4.15 RAWTEXT end tag open state
        16. 8.2.4.16 RAWTEXT end tag name state
        17. 8.2.4.17 Script data less-than sign state
        18. 8.2.4.18 Script data end tag open state
        19. 8.2.4.19 Script data end tag name state
        20. 8.2.4.20 Script data escape start state
        21. 8.2.4.21 Script data escape start dash state
        22. 8.2.4.22 Script data escaped state
        23. 8.2.4.23 Script data escaped dash state
        24. 8.2.4.24 Script data escaped dash dash state
        25. 8.2.4.25 Script data escaped less-than sign state
        26. 8.2.4.26 Script data escaped end tag open state
        27. 8.2.4.27 Script data escaped end tag name state
        28. 8.2.4.28 Script data double escape start state
        29. 8.2.4.29 Script data double escaped state
        30. 8.2.4.30 Script data double escaped dash state
        31. 8.2.4.31 Script data double escaped dash dash state
        32. 8.2.4.32 Script data double escaped less-than sign state
        33. 8.2.4.33 Script data double escape end state
        34. 8.2.4.34 Before attribute name state
        35. 8.2.4.35 Attribute name state
        36. 8.2.4.36 After attribute name state
        37. 8.2.4.37 Before attribute value state
        38. 8.2.4.38 Attribute value (double-quoted) state
        39. 8.2.4.39 Attribute value (single-quoted) state
        40. 8.2.4.40 Attribute value (unquoted) state
        41. 8.2.4.41 Character reference in attribute value state
        42. 8.2.4.42 After attribute value (quoted) state
        43. 8.2.4.43 Self-closing start tag state
        44. 8.2.4.44 Bogus comment state
        45. 8.2.4.45 Markup declaration open state
        46. 8.2.4.46 Comment start state
        47. 8.2.4.47 Comment start dash state
        48. 8.2.4.48 Comment state
        49. 8.2.4.49 Comment end dash state
        50. 8.2.4.50 Comment end state
        51. 8.2.4.51 Comment end bang state
        52. 8.2.4.52 DOCTYPE state
        53. 8.2.4.53 Before DOCTYPE name state
        54. 8.2.4.54 DOCTYPE name state
        55. 8.2.4.55 After DOCTYPE name state
        56. 8.2.4.56 After DOCTYPE public keyword state
        57. 8.2.4.57 Before DOCTYPE public identifier state
        58. 8.2.4.58 DOCTYPE public identifier (double-quoted) state
        59. 8.2.4.59 DOCTYPE public identifier (single-quoted) state
        60. 8.2.4.60 After DOCTYPE public identifier state
        61. 8.2.4.61 Between DOCTYPE public and system identifiers state
        62. 8.2.4.62 After DOCTYPE system keyword state
        63. 8.2.4.63 Before DOCTYPE system identifier state
        64. 8.2.4.64 DOCTYPE system identifier (double-quoted) state
        65. 8.2.4.65 DOCTYPE system identifier (single-quoted) state
        66. 8.2.4.66 After DOCTYPE system identifier state
        67. 8.2.4.67 Bogus DOCTYPE state
        68. 8.2.4.68 CDATA section state
        69. 8.2.4.69 Tokenizing character references
      5. 8.2.5 Tree construction
        1. 8.2.5.1 Creating and inserting elements
        2. 8.2.5.2 Closing elements that have implied end tags
        3. 8.2.5.3 Foster parenting
        4. 8.2.5.4 The rules for parsing tokens in HTML content
          1. 8.2.5.4.1 The "initial" insertion mode
          2. 8.2.5.4.2 The "before html" insertion mode
          3. 8.2.5.4.3 The "before head" insertion mode
          4. 8.2.5.4.4 The "in head" insertion mode
          5. 8.2.5.4.5 The "in head noscript" insertion mode
          6. 8.2.5.4.6 The "after head" insertion mode
          7. 8.2.5.4.7 The "in body" insertion mode
          8. 8.2.5.4.8 The "text" insertion mode
          9. 8.2.5.4.9 The "in table" insertion mode
          10. 8.2.5.4.10 The "in table text" insertion mode
          11. 8.2.5.4.11 The "in caption" insertion mode
          12. 8.2.5.4.12 The "in column group" insertion mode
          13. 8.2.5.4.13 The "in table body" insertion mode
          14. 8.2.5.4.14 The "in row" insertion mode
          15. 8.2.5.4.15 The "in cell" insertion mode
          16. 8.2.5.4.16 The "in select" insertion mode
          17. 8.2.5.4.17 The "in select in table" insertion mode
          18. 8.2.5.4.18 The "after body" insertion mode
          19. 8.2.5.4.19 The "in frameset" insertion mode
          20. 8.2.5.4.20 The "after frameset" insertion mode
          21. 8.2.5.4.21 The "after after body" insertion mode
          22. 8.2.5.4.22 The "after after frameset" insertion mode
        5. 8.2.5.5 The rules for parsing tokens in foreign content
      6. 8.2.6 The end
      7. 8.2.7 Coercing an HTML DOM into an infoset
      8. 8.2.8 An introduction to error handling and strange cases in the parser
        1. 8.2.8.1 Misnested tags: <b><i></b></i>
        2. 8.2.8.2 Misnested tags: <b><p></b></p>
        3. 8.2.8.3 Unexpected markup in tables
        4. 8.2.8.4 Scripts that modify the page as it is being parsed
        5. 8.2.8.5 The execution of scripts that are moving across multiple documents
        6. 8.2.8.6 Unclosed formatting elements
    3. 8.3 Serializing HTML fragments
    4. 8.4 Parsing HTML fragments
    5. 8.5 Named character references
  9. 9 The XHTML syntax
    1. 9.1 Writing XHTML documents
    2. 9.2 Parsing XHTML documents
    3. 9.3 Serializing XHTML fragments
    4. 9.4 Parsing XHTML fragments
  10. 10 Rendering
    1. 10.1 Introduction
    2. 10.2 The CSS user agent style sheet and presentational hints
    3. 10.3 Non-replaced elements
      1. 10.3.1 Hidden elements
      2. 10.3.2 The page
      3. 10.3.3 Flow content
      4. 10.3.4 Phrasing content
      5. 10.3.5 Bidirectional text
      6. 10.3.6 Quotes
      7. 10.3.7 Sections and headings
      8. 10.3.8 Lists
      9. 10.3.9 Tables
      10. 10.3.10 Form controls
      11. 10.3.11 The hr element
      12. 10.3.12 The fieldset element
    4. 10.4 Replaced elements
      1. 10.4.1 Embedded content
      2. 10.4.2 Images
      3. 10.4.3 Attributes for embedded content and images
      4. 10.4.4 Image maps
      5. 10.4.5 Toolbars
    5. 10.5 Bindings
      1. 10.5.1 Introduction
      2. 10.5.2 The button element
      3. 10.5.3 The details element
      4. 10.5.4 The input element as a text entry widget
      5. 10.5.5 The input element as domain-specific widgets
      6. 10.5.6 The input element as a range control
      7. 10.5.7 The input element as a color well
      8. 10.5.8 The input element as a checkbox and radio button widgets
      9. 10.5.9 The input element as a file upload control
      10. 10.5.10 The input element as a button
      11. 10.5.11 The marquee element
      12. 10.5.12 The meter element
      13. 10.5.13 The progress element
      14. 10.5.14 The select element
      15. 10.5.15 The textarea element
      16. 10.5.16 The keygen element
    6. 10.6 Frames and framesets
    7. 10.7 Interactive media
      1. 10.7.1 Links, forms, and navigation
      2. 10.7.2 The title attribute
      3. 10.7.3 Editing hosts
      4. 10.7.4 Text rendered in native user interfaces
    8. 10.8 Print media
  11. 11 Obsolete features
    1. 11.1 Obsolete but conforming features
      1. 11.1.1 Warnings for obsolete but conforming features
    2. 11.2 Non-conforming features
    3. 11.3 Requirements for implementations
      1. 11.3.1 The applet element
      2. 11.3.2 The marquee element
      3. 11.3.3 Frames
      4. 11.3.4 Other elements, attributes and APIs
  12. 12 IANA considerations
    1. 12.1 text/html
    2. 12.2 multipart/x-mixed-replace
    3. 12.3 application/xhtml+xml
    4. 12.4 application/x-www-form-urlencoded
    5. 12.5 text/cache-manifest
    6. 12.6 web+ scheme prefix
  13. Index
    1. Elements
    2. Element content categories
    3. Attributes
    4. Interfaces
    5. Events
  14. References
  15. Acknowledgements