HTML 5.2: 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 between Working Draft 5 and Working Draft 4

Added 'creator context security': Defines a new 'creator context security' concept, which replaces the 'creator document' concept that Secure Context used to rely on
Updated dfn text: Refines terminology, and allows li as ancestor
Corrected row/col header algorithm: Corrected conditions for determining table row/column headers
Removed showModalDialog: Removes the showModalDialog method, which is being made obsolete in browsers
Added noopener link relation: Adds the noopener link relation, a requirement of Secure Context
Made surearea can be activated other than with pointer: Tightens up the requirement for interaction with area
Removed references to BE CSS (notions of binding): Removes references to the binding property proposed in the defunct Behavorial Extensions to CSS specification
Removed references to event parent: Completes removal of <iframe seamless>
Allowed div as child of dl: Allows the div element as a direct child of the dl element

Changes between Working Draft 4 and Working Draft 3

Add manifest attribute

Added the manifest attribute (specifies the location of the document’s cache manifest) to the html element.

Added iframe allowpaymentrequest attribute

Added the allowpaymentrequest attribute (used by the Payment Request API to determine if Document objects in an iframe element’s browsing context are to be allowed to make payment requests) to the iframe element.

Integrated WHATWG changes

Included:

Reflecting a broken URL should return the unparsed value
Add MathML and SVG to dependencies and cross reference them correctly
Resetting a textarea should reset its dirty value flag
remove domain to ascii term
Add recursion check to frame elements* Make document.open() and close() check for XML document
Change data type for HashChageEvent to match reality* Make marker of summary inside
Make selection members nullable types

Add definition of allowed to use

Added steps for determining whether a Document object document is allowed to use the feature indicated by attribute name

Add advisement about HTML manifest removal plans

Added an advisement that manifest-based application cache feature is in the process of being removed from the web platform.

Allow <link rel="apple-touch-icon sizes...>

Added the apple-touch-icon keyword to the rel attribute values required for the size attribute to be used on the link element.

Final changes for a clean section 3

Includes:

Adding innerText attribute
Removal of restrictions on BiDi algorithm section

Changes between Working Draft 3 and Working Draft 2

Allow headings within legend: This was proposed in issue #724, to enable better semantic markup. It works already in practice.
Incorporate blocking of element loading based on type, from [CSP3]
Updated allowed ARIA roles for form controls and many other elements: This matches the normative ARIA in HTML specification [html-aria].
Update ARIA version to match [wai-aria-1.1]: This allows some more roles, states and properties for improved accessibility
Describe real behaviour for elements made focusable by addon tabindex: This change is to describe real implementation in browsers, which unfortunately does not reflect the desirable behaviour earlier specified.
Tighten restrictions on navigation control for sandboxed contexts

Changes between Working Draft 2 and the First Public Working Draft

Treat data: URLs as a separate origin: data: URLs will have a unique, opaque origin rather than inheriting that of the settings object. This aligns with Blink / Gecko / Webkit behaviour
Various fixes for compatibility with WHATWG specification: Reflecting a broken URL should return the unparsed value; Allow currentScript to return SVGScriptElement; Resetting a textarea should reset its dirty value flag; Make document.open() and close() check for XML document; Change data type for HashChangeEvent to match reality; Make selection members nullable types; Formalize bogus comment state
Add about:html-kind URL definition: This allows for MP4 media track integration
Add nonce to link: For use in Content Security Policy [CSP3]
Add WindowOrWorkerGlobalScope mixin: A convenie nce that simplifies adding functionality for Window and WorkerGlobalScope objects
Make label-less empty option okay as a datalist child
caption element cannot take role values

Changes since HTML 5.1 - Note that these may change if the HTML 5.1 specification is updated.

toolbar type for menu: This was removed from HTML 5.1 for lack of implementation, and may be removed from HTML 5.2 if not implemented.
dialog element: This was removed from HTML 5.1 for lack of implementation, and may be removed from HTML 5.2 if not implemented.
registerContentHandler(), isContentHandlerRegistered() and isProtocolHandlerRegistered(): These were removed from HTML 5.1 for lack of implementation, and may be removed from HTML 5.2 if not implemented.
datetime value for type
This was removed from HTML 5.1 for lack of implementation, and may be removed from HTML 5.2 if not implemented.
inputmode: This was removed from HTML 5.1 for lack of implementation, and may be removed from HTML 5.2 if not implemented.
keygen has been removed: As per Working Group decision, since it is likely to be removed soon from at least one of the two remaining implementations.
Modules, for scripts