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5.2. Changes from 23 April 2009 to 25 August 2009

• When the time element is empty user agents have to render the time in a locale-specific manner.
• The load event is dispatched at Window, but now has Document as its target.
• pushState() now affects the Referer (sic) header.
• onundo and onredo are now on Window.
• Media elements now have a startTime member that indicates where the current resource starts.
• header has been renamed to hgroup and a new header element has been introduced.
• createImageData() now also takes ImageData objects.
• createPattern() can now take a video element as argument too.
• The footer element is no longer allowed in header and header is not allowed in address or footer.
• A new control has been introduced: <input type="tel">
• The Command API now works for all elements.
• accesskey is now properly defined.
• section and article now take a cite attribute.
• A new feature called Microdata has been introduced which allows people to embed custom data structures in their HTML documents.
• Using the Microdata model three predefined vocabularies have also been included: vCard, vEvent, and a model for licensing.
• Drag and drop has been updated to work with the Microdata model.
• The last of the parsing quirks has been defined.
• textLength has been added as member of the textarea element.
• The rp element now takes phrasing content rather than a single character.
• location.reload() is now defined.
• The hashchange event now fires asynchronously.
• Rules for compatibility with XPath 1.0 and XSLT 1.0 have been added.
• The spellcheck IDL attribute now maps to a DOMString.
• hasFeature() support has been reduced to a minimum.
• The Audio() constructor sets the autobuffer attribute.
• The td element is no longer allowed in thead.
• The input element and DataTransfer object now have a files IDL attribute.
• The datagrid and bb have been removed due to their design not being agreed upon.
• The cue range API has been removed from the media elements.
• Support for WAI-ARIA has been integrated.

On top of this list quite a few minor clarifications, typos, issues specific to implementors, and other small problems have been resolved.

In addition, the following parts of HTML5 have been taken out and will likely be further developed at the IETF:

• Definition of URLs.
• Definition of Content-Type sniffing.

5.3. Changes from 12 February 2009 to 23 April 2009

• A new global attribute called spellcheck has been added.
• Defined that ECMAScript this in the global object returns a WindowProxy object rather than the Window object.
• The value IDL attribute for input elements in the File Upload state is now defined.
• Definition of designMode was changed to be more in line with legacy implementations.
• The drawImage() method of the 2D drawing API can now take a video element as well.
• The way media elements load resources has been changed.
• document.domain is now IPv6-compatible.
• The video element gained an autobuffer boolean attribute that serves as a hint.
• You are now allowed to specify the meta element with a charset attribute in XML documents if the value of that attribute matches the encoding of the document. (Note that it does not specify the value, it is just a talisman.)
• The bufferingRate and bufferingThrottled members of media elements have been removed.
• The media element resource selection algorithm is now asynchronous.
• The postMessage() API now takes an array of MessagePort objects rather than just one.
• The second argument of the add() method on the select element and the options member of the select element is now optional.
• The action, enctype, method, novalidate, and target attributes on input and button elements have been renamed to formaction, formenctype, formmethod, formnovalidate, and formtarget.
• A "storage mutex" concept has been added to deal with separate pages trying to change a storage object (document.cookie and localStorage) at the same time. The Navigator gained a getStorageUpdates() method to allow it to be explicitly released.
• A syntax for SVG similar to MathML is now defined so that SVG can be included in text/html resources.
• The placeholder attribute has been added to the textarea element.
• Added a keygen element for key pair generation.
• The datagrid element was revised to make the API more asynchronous and allow for unloaded parts of the grid.

In addition, several parts of HTML5 have been taken out and will be further developed by the Web Applications Working Group as standalone specifications:

• WebSocket API
• WebSocket protocol
• Server-Sent Events
• Web Storage (localStorage and sessionStorage)
• Web SQL Database

5.4. Changes from 10 June 2008 to 12 February 2009

• The data member of ImageData objects has been changed from an array to a CanvasPixelArray object.
• Shadows are now required from implementations of the canvas element and its API.
• Security model for canvas is clarified.
• Various changes to the processing model of canvas have been made in response to implementation and author feedback. E.g. clarifying what happens when NaN and Infinity are passed and fixing the definitions of arc() and arcTo().
• innerHTML in XML was slightly changed to improve round-tripping.
• The toDataURL() method on the canvas element now supports setting a quality level when the media type argument is image/jpeg.
• The poster attribute of the video element now affects its intrinsic dimensions.
• The behavior of the type attribute of the link element has been clarified.
• Sniffing is now allowed for link when the expected type is an image.
• A section on URLs is introduced dealing with how URL values are to be interpreted and what exactly authors are required to do. Every feature of the specification that uses URLs has been reworded to take the new URL section into account.
• It is now explicit that the href attribute of the base element does not depend on xml:base.
• It is now defined what the behavior should be when the base URL changes.
• URL decomposition IDL attributes are now more aligned with Internet Explorer.
• The xmlns attribute with the value http://www.w3.org/1999/xhtml is now allowed on all HTML elements.
• data-* attributes and custom attributes on the embed element now have to match the XML Name production and cannot contain a colon.
• WebSocket API is introduced for bidirectional communication with a server.
• The default value of volume on media elements is now 1.0 rather than 0.5.
• event-source was renamed to eventsource because no other HTML element uses a hyphen.
• A message channel API has been introduced augmenting postMessage().
• A new element named bb has been added. It represents a user agent command that the user can invoke.
• The addCueRange() method on media elements has been modified to take an identifier which is exposed in the callbacks.
• It is now defined how to mutate a DOM into an infoset.
• The parent attribute of the Window object is now defined.
• The embed element is defined to do extension sniffing for compatibilty with servers that deliver Flash as text/plain. (This is marked as an issue in the specification to figure out if there is a better way to make this work.)
• The embed can now be used without its src attribute.
• getElementsByClassName() is defined to be ASCII case-insensitive in quirks mode for consistency with CSS.
• In HTML documents localName no longer returns the node name in uppercase.
• data-* attributes are defined to be always lowercase.
• The opener attribute of the Window object is not to be present when the page was opened from a link with target="_blank" and rel="noreferrer".
• The top attribute of the Window object is now defined.
• The a element now allows nested flow content, but not nested interactive content.
• It is now defined what the header element means to document summaries and table of contents.
• What it means to fetch a resource is now defined.
• Patterns are now required for the canvas element.
• The autosubmit attribute has been removed from the menu element.
• Support for outerHTML and insertAdjacentHTML() has been added.
• xml:lang is now allowed in HTML when lang is also specified and they have the same value. In XML lang is allowed if xml:lang is also specified and they have the same value.
• The frameElement attribute of the Window object is now defined.
• An event loop and task queue is now defined detailing script execution and events. All features have been updated to be defined in terms of this mechanism.
• If the alt attribute is omitted a title attribute, an enclosing figure element with a legend element descendant, or an enclosing section with an associated heading must be present.
• The irrelevant attribute has been renamed to hidden.
• The definitionURL attribute of MathML is now properly supported. Previously it would have ended up being all lowercase during parsing.
• User agents must treat US-ASCII as Windows-1252 for compatibility reasons.
• An alternative syntax for the DOCTYPE is allowed for compatibility with some XML tools.
• Data templates have been removed (consisted of the datatemplate, rule and nest elements).
• The media elements now support just a single loop attribute.
• The load() method on media elements has been redefined as asynchronous. It also tries out files in turn now rather than just looking at the type attribute of the source element.
• A new member called canPlayType() has been added to the media elements.
• The totalBytes and bufferedBytes attributes have been removed from the media elements.
• The Location object gained a resolveURL() method.
• The q element has changed again. Punctation is to be provided by the user agent again.
• Various changes were made to the HTML parser algorithm to be more in line with the behavior Web sites require.
• The unload and beforeunload events are now defined.
• The IDL blocks in the specification have been revamped to be in line with the upcoming Web IDL specification.
• Table headers can now have headers. User agents are required to support a headers attribute pointing to a td or th element, but authors are required to only let them point to th elements.
• Interested parties can now register new http-equiv values.
• When the meta element has a charset attribute it must occur within the first 512 bytes.
• The StorageEvent object now has a storageArea attribute.
• It is now defined how HTML is to be used within the SVG foreignObject element.
• The notification API has been dropped.
• How [[Get]] works for the HTMLDocument and Window objects is now defined.
• The Window object gained the locationbar, menubar, personalbar, scrollbars, statusbar and toolbar attributes giving information about the user interface.
• The application cache section has been significantly revised and updated.
• document.domain now relies on the Public Suffix List. [PSL]
• A non-normative rendering section has been added that describes user agent rendering rules for both obsolete and conforming elements.
• A normative section has been added that defines when certain selectors as defined in the Selectors and the CSS3 Basic User Interface Module match HTML elements. [SELECTORS] [CSS-UI]

Web Forms 2.0, previously a standalone specification, has been fully integrated into HTML5 since last publication. The following changes were made to the forms chapter:

• Support for XML submission has been removed.
• Support for form filling has been removed.
• Support for filling of the select and datalist elements through the data attribute has been removed.
• Support for associating a field with multiple forms has been removed. A field can still be associated with a form it is not nested in through the form attribute.
• The dispatchChangeInput() and dispatchFormChange() methods have been removed from the select, input, textarea, and button elements.
• Repetition templates have been removed.
• The inputmode attribute has been removed.
• The input element in the File Upload state no longer supports the min and max attributes.
• The allow attribute on input elements in the File Upload state is no longer authoritative.
• The pattern and accept attributes for textarea have been removed.
• RFC 3106 is no longer explicitly supported.
• The submit() method now just submits, it no longer ensures the form controls are valid.
• The input element in the Range state now defaults to the middle, rather than the minimum value.
• The size attribute on the input element is now conforming (rather than deprecated).
• object elements now partake in form submission.
• The type attribute of the input element gained the values color and search.
• The input element gained a multiple attribute which allows for either multiple e-mails or multiple files to be uploaded depending on the value of the type attribute.
• The input, button and form elements now have a novalidate attribute to indicate that the form fields sh