HTML 5.3: Changes

Changes

This section summarises substantial substantive changes between Public Working Drafts, as a guide for general review.

Full details of all changes since 12 January 2016 are available from the commit log of the w3c/html github repository, including various editorial and linking fixes.

Changes since the HTML 5.3 Second Public Working Draft

Only select a browsing context by name from within the unit of related browsing contexts.: Match Firefox and Blink changes, to mitigate an XSS attack vector.
loosen the rule of the rb element: the rb element can be parsed propertly if the current node is a child of the ruby element
Add the slot element
Add the :defined psuedo-class selector definition: Substantive change for custom elements.
Add the :defined psuedo-class selector definition: Substantive change for custom elements. This is at risk with only one known implementation
Add autonomous custom elements: Substantive change, implemented in Firefox, Blink, Webkit; Includes the CustomElementRegistry object, the CEReactions and HTMLConstructor extended IDL attributes, defining custom elements, and upgrades
Add customized built-in elements: Substantive change, implemented in Blink, Firefox(?); Includes is attribute, extending existing HTML elements
Make rev content attribute reflect the IDL attribute, define the rev IDL attribute: Substantive change to fix #issue 1151 that helps match reality.
Remove monkey-patch 2.9.10 for FileAPI: FileAPI is better defined in FileApi spec. Fixed issue 1217
Focusing the dialog instead of the first focusable element if there are no autofocus elements: Substantive change. Fixes issue 773. Potentially at risk.
Clarify that the DOCTYPE is ignored, if present, for srcdoc: Clarification, match reality. Fixes issue 254
Added customElements IDL attribute to the Window object: Fixes #1274. Substantive change matching new implementation of Custom Elements in Blink / Gecko.
Other Pragma Directives removed.: Change to match reality. Fixed issue 1212
Caption end tag can be ommitted.: Substantive change to match reality. Fixed issue 1158
Add Windows Clipboard Format for the media-type registrations of HTML
Mandate UTF-8: Substantive change to match reality. UTF-8 is now mandatory for all new pages. Fixed issue 1039
Add MacOSX Uniform Type Identifier for the media-type registrations of HTML
Adds capture attribute: Adds the capture attribute to the allowed attributes for the input element. Fixes #1296
Adds autofill warning: Editorial: Adds warning that UA should verify visibility of forms with the autocomplete attribute in the autofill expectation mantle. Fixed issue 1285

Changes between the HTML 5.3 Second Public Working Draft and the HTML 5.3 First Public Working Draft

Add missing link rel definitions.: Substantive change. Fixed issue 987
Add focusin and focusout events: Substantive change. Fixed issue 278
Allow fully internationalised email addresses in the E-mail type, as per [RFC6531].: Substantive change. Fixed issue 845
Specify allowable context types for canvas in the HTML spec. Include [webgl-2] as a specified type.: Substantive change. Fixed issue 1118
Fix discrepancies between HTML and ARIA in HTML specs: Substantive change. Fixed issue 894
Don’t require XML srcdoc in XHTML: Substantive change. Fixed issue 890
Removing magic alignment for dialog element: Removed due to lack of implementation. Fixed issue 1108
nonce now uses the [[CryptographicNonce]]: Hide nonce content attribute to avoid leaking it.
Removed section on anchor-points: Substantive change. Fixed issue 1104
Added disableRemotePlayback to the HTMLMediaElement interface: Fixed issue 1047
Cleaned up the Fetch sections to apply the cryptographic nonce metadata, and the integrity attribute from [SRI]: Fixed issue 198

Changes between the HTML 5.3 First Public Working Draft and HTML 5.2

Refactor document.domain setter, adding concept of "is a registrable domain suffix of or is equal to": Fixed Issue 769
Adds the ping attribute: Fixed Issue #369
add the allowusermedia attribute to iframe: Fixed Issue 778
Update the preload Link type and add the as attribute: Fixed Issue 1044
Add the autocapitalize attribute: Fixed Issue 208