Html input radio default value
W3C liabilitytrademark and document use rules apply. HTML Accessibility API Mappings HTML -AAM defines how user agents map HTML 5. It leverages and extends the Core Accessibility API Mappings 1. Computation and API Mappings 1. Documenting these mappings promotes interoperable exposure of roles, states, properties, and events implemented by accessibility APIs and helps to ensure that this information appears in a manner consistent with author intent.
The HTML -AAM is part of the WAI-ARIA suite described in the WAI-ARIA Overview. 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 latest revision of this technical report can be found in the W3C technical reports index at https: You can file a bug on this specification. This document was Initially developed by and with the approval of the HTML Accessibility Taskforcea joint task force of the Protocols and Formats Working Group and the HTML Working Group.
Work continued with the successor groups Accessible Rich Internet Applications Working Group and the Web Platform Working Group. The document is now maintained solely by the Web Platform WG. This document was published by the Web Platform Working Group as a Working Draft. This document is intended to become a W3C Recommendation.
Comments regarding this document are welcome. Please send them to public-html-comments w3. Publication as a Working Draft does not imply endorsement by the W3C Membership.
This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than work in progress. This document was produced by a group operating under the 5 February 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.
This document is governed by the 1 March W3C Process Document. Like the Core Accessibility API Mappings specification, this document defines how HTML user agents must respond to keyboard focus, as well as rolestate and property information provided for Web content. Where an HTML element or attribute has default Accessible Rich Internet Applications WAI-ARIA 1. Where an HTML element or attribute does not have default WAI-ARIA semantics, the applicable mapping for each platform accessibility API is defined by this specification.
This document also adapts the Accessible Name and Description: Computation and API Mappings [ ACCNAME-AAM ] for deriving the accessible names and accessible descriptions of HTML 5. Users often access HTML content using assistive technologies that rely on platform accessibility API to obtain and interact with information from the page. This document is part of the following suite of accessibility API mapping specifications for content rendered by user agents:.
Accessibility APIs covered by this document are:. If user agent developers need to expose information using other accessibility APIsit is recommended that they work closely with the developer of the platform where the API runs, and assistive technology developers on that platform. For more information regarding accessibility APIsrefer to section 1. As well as sections marked as non-normative, all authoring guidelines, diagrams, examples, and notes in this specification are non-normative.
Everything else in this specification is normative. The key words MAY and MUST are to be interpreted as described in [ RFC ]. When these key words are used, but do not share this format, they do not convey any formal conformance requirements in the RFC sense, and are merely explanatory, i. As much as possible, such usage is avoided in this specification.
The classification of a section as normative or non-normative applies to the entire section and all sub-sections of that section.
html - How to select a radio button by default? - Stack Overflow
Normative sections provide requirements that authors, user agents, and assistive technologies MUST follow for an implementation to conform to this specification. Non-normative sections provide information useful to understanding the specification. Such sections may contain examples of recommended practice, but it is not required to follow such recommendations in order to conform to this specification.
While some terms are defined in place, the following definitions are used throughout this document. Operating systems and other platforms provide a set of interfaces that expose information about objects and events to assistive technologies.
Assistive technologies use these interfaces to get information about and interact with those widgets. An accessible object in the accessibility tree and its descendants in that tree. It does not include objects which have relationships other than parent-child in that tree. For example, it does not include objects linked via aria-flowto unless those objects are also descendants in the accessibility tree. Tree of accessible objects that represents the structure of the user interface UI.
Each node in the accessibility tree represents an element in the UI as exposed through the accessibility API ; for example, a push button, a check box, or container. An accessible description provides additional information, related to an interface element, that complements the accessible name. The accessible description might or might not be visually perceivable.
The accessible name is the name of a user interface element. Each platform accessibility API provides the accessible name property. The value of the accessible name may be derived from a visible e.
See related accessible description. A simple use for the accessible name property may be illustrated by an "OK" button. The text "OK" is the accessible name. When the button receives focus, assistive technologies may concatenate the platform's role description with the accessible name. For example, a screen reader may speak "push-button OK" or "OK button". The order of concatenation and specifics of the role description e. A node in the accessibility tree of a platform accessibility API.
Accessible objects expose various statespropertiesand events for use by assistive technologies. In the context of markup languages e. The action taken when an eventtypically initiated by users through an input device, causes an element to fulfill a defined role. The role may be defined for that element by the host language, or by author-defined variables, or both. The role for any given element may be a generic action, or may be unique to that element.
Examples of assistive technologies that are important in the context of this document include the following:. In this specification, attribute is used as it is in markup languages. Attributes are structural features added to elements to provide information about the states and properties of the object represented by the element. A set of instance objects that share similar characteristics. A deprecated rolestateor property is one which has been outdated by newer constructs or changed circumstances, and which may be removed in future versions of the WAI-ARIA specification.
User agents are encouraged to continue to support items identified as deprecated for backward compatibility. For more information, see Deprecated Requirements in the Conformance section. In this specification, element is used as it is in markup languages. Elements are the structural elements in markup language that contains the data profile for objects. A programmatic message used to communicate discrete changes in the state of an object to other objects in a computational system.
User input to a web page is commonly mediated through abstract events that describe the interaction and can provide notice of changes to the state of a document object. In some programming languages, events are more commonly known as notifications. Translated to platform-specific accessibility APIs as defined in the WAI-ARIA User Agent Implementation Guide.
A document containing graphic representations with user-navigable parts. Charts, maps, diagrams, blueprints, and dashboards are examples of graphical documents.
A graphical document is composed using any combination of symbols, images, text, and graphic primitives shapes such as circles, points, lines, paths, rectangles, etc. Indicates that the element is not visible, perceivableor interactive to any user. An element is considered hidden if it or any one of its ancestor elements is not rendered or is explicitly hidden. Content provided for information purposes and not required for conformance. Content required for conformance is referred to as normative.
Accessible to the user using a keyboard or assistive technologies that mimic keyboard input, such as a sip and puff tube. References in this document relate to WCAG 2. Make all functionality available from a keyboard [ WCAG20 ].
HTML Form Tutorial Part II : More Input Elements
A type of region on a page to which the user may want quick access. Content in such a region is different from that of other regions on the page and relevant to a specific user purpose, such as navigating, searching, perusing the primary content, etc. Live regions are perceivable regions of a web page that are typically updated as a result of an external event when user focus may be elsewhere. These regions are not always updated as a result of a user interaction.
This practice has become commonplace with the growing use of Ajax. Examples of live regions include a chat log, stock ticker, or a sport scoring section that updates periodically to reflect game statistics. Since these asynchronous areas are expected to update outside the user's area of focus, assistive technologies such as screen readers have either been unaware of their existence or unable to process them for the user.
WAI-ARIA has provided a collection of properties that allow the author to identify these live regions and process them: Pre-defined live region roles are listed in the Choosing Between Special Case Live Regions [ WAI-ARIA-PRACTICES ], Section 5. An implementing host language's primary content element, such as the body element in HTML. Accessibility API state that is controlled by the user agent, such as focus and selection. These are contrasted with "unmanaged states" that are typically controlled by the author.
Nevertheless, authors can override some managed states, such as aria-posinset and aria-setsize. Many managed states have corresponding CSS pseudo-classes, such as: The Nemeth Braille Code for Mathematics is a braille code for encoding mathematical and scientific notation.
See Nemeth Braille on Wikipedia. Basic type of object in the DOM tree or accessibility tree. DOM nodes are further specified as Element or Text nodesamong other types. The nodes of an accessibility tree are unary binary operators difference objects.
By contrast, content identified mechanical stock green room trading review systems informative or "non-normative" is not required for conformance. In the context of user interfaces, an item in the perceptual user experience, represented in markup languages by one or more elementsand rendered by user agents. A description of the characteristics of classes and how they relate to each other.
Usable by users in ways they can control. Content must be operable [ WCAG20 ]. An 'owned element' is any DOM descendant of the elementany element specified as a child via aria-ownsor any DOM descendant of the owned child. An 'owning element' is any DOM ancestor of the elementor any element with an aria-owns attribute which references the ID of the element.
Presentable to users in ways they can sense. Content must be perceivable [ WCAG20 ]. Attributes that are essential to the nature of a given objector that represent a data value associated with the object. A change of a property may significantly impact the meaning or presentation of an object. Certain properties for example, aria-multiline are less likely to change than statesbut note that the html input radio default value of change difference is not a rule.
A few properties, such as aria-activedescendantaria-valuenowand aria-valuetext are expected to change often. See clarification of states versus properties. A connection between two distinct things. Relationships may be of various types to indicate which object labels another, controls another, etc.
Main indicator of type. The primary element containing non-metadata content. The meaning of something as understood by a human, defined in a way that computers can process a representation of an objectsuch as elements and attributesand reliably represent the object in a way that various humans will achieve a mutually consistent understanding of the object. A state is a dynamic property expressing characteristics of an object that may change in response to user action or automated processes.
States do not affect the essential nature of the object, but represent data associated with the object or user interaction possibilities. A sub-document may contain a document, an application or any widget such as a calendar pulled in from another server. An element specified in a WAI-ARIA relation. A hierarchical definition of how the characteristics of various classes relate to each other, in realne zyski na forex classes inherit the properties of superclasses egyptian stocks listed on nyse and nasdaq the hierarchy.
A taxonomy can comprise part of the formal definition of an ontology. Type of DOM node that represents the textual content of an attribute or an element. A Text node has no child nodes. Presentable to users in ways they can construct an appropriate meaning.
Information and the operation of user interface must be understandable [ WCAG20 ]. Any software that retrieves, renders and facilitates end user interaction with Web content. This definition may differ from that used in other documents. Discrete user interface object with which the user can interact.
Widgets range from simple objects that have one value or operation e. WAI-ARIA support was first introduced to HTML in HTML5 [ HTML5 ]. Matrix forex card icici an HTML element or attribute has default WAI-ARIA semantics, it MUST be exposed to the platform accessibility APIs in a way that conforms to General rules for exposing WAI-ARIA semantics in the Core Accessibility API Mappings [ CORE-AAM ].
Where the host language is HTML 5. HTML may have features that are not supported by accessibility APIs at the time of publication. There is not a one to one relationship between all features and platform accessibility APIs. When HTML roles, states and properties do not directly map to an accessibility APIand there is a method in the API to expose a text string, user agents MUST expose the undefined role, states and properties via that method.
For HTML elements or attributes with default WAI-ARIA semantics, user agents MUST conform to Exposing attributes that do not directly map to accessibility API properties in the Core Accessibility API Mappings [ Merrill lynch stock trade fees ].
In MSAAthe value of an accessible object 's Role property is retrieved with the IAccessible:: This method returns a VARIANT that is limited to a finite number of integer role constants insufficient for describing the role of every HTML element, especially new elements introduced by HTML5. To address this limitation, some user agents, e. For example, Firefox returns the element's tag name as a BSTR for the following: Similarly, Chrome returns the element's tag name for: If implemented as a complex widget use: When the label element has a for attribute referencing another element, the LabeledBy property for the referenced element points to the UIA element for the label element.
IAccessibleText2 ; IAccessibleHypertext2. The terms accessible name and accessible description are properties provided in all accessibility APIs. The name of the properties may differ across APIs but they serve the same function: The text alternative computation is used xm forex spreads generate both the accessible name and accessible description.
There are different rules provided for several html input radio default value types of elementsnodesand combinations of markup. The presence of any of these indicates the author's intention to indicate that the img is decorative or redundant. In this case, the user agent must set the name to an empty string. If none of these attributes are present, this indicates the author simply did not provide an accessible label for the image, and the implementation must return an accessible name of NULL instead of an empty string if the accessibility Aftermarket parts for remington 700 sps tactical supports it.
This hints to the assistive technology to do its own heuristic processing to repair the online jobs for students without investment from home in delhi accessible name.
The document referenced by the src of the iframe element gets its name from that document's title element, like any other document. If there is no title provided, there is no accessible name. Pressing the spacebar or enter key when the summary element has focus will show the details element content if the content is hidden. If the details element content is showing and the summary element has focus, pressing the spacebar or enter key will hide the details element content. The summary element should be mapped to a disclosure triangle role best way to make money with skills in runescape f2p accessibility APIs that have such a role.
For example the Mac accessibility API includes the AXDisclosureTriangle role. In accessibility APIs that do not have such a fine grained role, the summary element should be mapped to a button role. The role mapping table contains recommended mappings for the summary element. Odds of a stock market crash default accessible name for the summary element is the text content of the summary element.
When the details element content is hidden, the state earn money online india quora the content should be reflected by an accessible state or property. In the Mac accessibility API on the summary element AXDisclosureTriangleset AXExpanded property to NO. When the details wynnum plaza trading hours australia day content is shown, on the summary element AXDisclosureTriangleset the AXExpanded property to YES.
The hidden and shown states of the details element content is reflected by the absence or presence of the open attribute. This publication has been funded in part with U. Federal funds from the Department of Education, National Institute on Disability, Independent Living, and Rehabilitation Research NIDILRRinitially under contract number ED-OSEC and currently under contract number HHSPC. The content of this publication does not necessarily reflect the views or policies of the U. Department of Education, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.
HTML Accessibility API Mappings 1. Accessibility API Operating systems and other platforms provide a set of interfaces that expose information about objects and events to assistive technologies. Accessibility Subtree An accessible object in the accessibility tree and its descendants in that tree. Accessibility Tree Tree of accessible objects that represents the structure of the user interface UI.
Accessible Description An accessible description provides additional information, related to an interface element, that complements the accessible name. Accessible Name The accessible name is the name of a user interface element. Accessible object A node in the accessibility tree of a platform accessibility API. Activation behavior The action taken when an binary options 8 polaroid conversion historytypically initiated by users through an input device, causes an element to fulfill a defined role.
Examples of assistive technologies that are important in the context of this document include the following: Attribute In this specification, attribute is used as it is in markup languages. Class A set of instance objects that share similar characteristics. Deprecated A deprecated rolestateor property is one which has been outdated by newer constructs or changed circumstances, and which may be does volatility increase call option value in future versions of the WAI-ARIA specification.
Element In this specification, element is used as it is in markup languages. Event A programmatic message used to communicate discrete changes in the state of an object to other objects in a computational system.
Expose Translated to platform-specific accessibility APIs as defined in the WAI-ARIA User Agent Implementation Guide. Hidden Indicates that the element is not visible, perceivableor interactive to any user.
Informative Content provided for information purposes and not required for conformance. Keyboard Accessible Accessible to the user using a keyboard or assistive technologies that mimic keyboard input, such as a sip and puff tube. Landmark A type of region on a page to which the user may want quick access. Live Region Live regions are perceivable regions of a web page that are typically updated as a trik jitu forex trading of an external event when user focus may be elsewhere.
Primary Content Element An implementing host language's primary content element, such as the body element in HTML. Managed State Accessibility API state that is controlled by the user agent, such as focus and selection.
Nemeth Braille The Nemeth Braille Code for Mathematics is a braille code for encoding mathematical and scientific notation. Node Basic type of object in the DOM tree or accessibility tree. Normative Required for conformance. Object In the context of user interfaces, an item in the perceptual user experience, represented in markup languages by one or more elementsand rendered by user agents. In the context of programming, the instantiation of one or more classes and interfaces which define the general characteristics of similar objects.
An object in an accessibility API may represent one or more DOM objects. Accessibility APIs have defined interfaces that are distinct from DOM interfaces. Ontology A description of the characteristics of classes and how they relate to each other. Operable Usable by users in ways they can control. Owned Element An 'owned element' is any DOM descendant of the elementany element specified as a child via aria-ownsor any DOM descendant of the owned child. Owning Element An 'owning element' is any DOM ancestor of the elementor any element with an aria-owns attribute which references the ID of the element.
Perceivable Presentable to users in ways they can sense. Property Attributes that are essential to the nature of a given objector that represent a data value associated with the object. Relationship A connection between two distinct things. Role Main indicator of type.
Root WAI-ARIA node The primary element containing non-metadata content. Semantics The meaning of something as understood by a human, defined in a way that computers can process a representation of an objectsuch as elements and attributesand reliably represent the object in a way that various humans will achieve a mutually consistent understanding of the object.
State A state is a dynamic property expressing characteristics of an object that may change in response to user action or automated processes. Target Element An element specified in a WAI-ARIA relation.
Taxonomy A hierarchical definition of how the characteristics of various classes relate to each other, in which classes inherit the properties of superclasses in the hierarchy. Text node Type of DOM node that represents the textual content of an attribute or an element.
Understandable Presentable to users in ways they can construct an appropriate meaning. User Agent Any software that retrieves, renders and facilitates end user interaction with Web content. Valid IDREF A reference to a target element in the same document that has a matching ID Widget Discrete user interface object with which the user can interact.
Mappings of HTML elements to platform accessibility APIs: IAccessibleHyperlink ; IAccessibleText2 ; IAccessibleHypertext2. Refer to WebKit bug If the controls attribute is present, each control is a child in the UIA tree, and mapped as buttonslideretc.
Loading and error text objects, along with any control not currently displayed, MAY be present in the UIA and marked as hidden or off-screen.
UI controls within the audio element exposed as AXToolbar. Exposed as "font-weight" text attribute on the text container.
The value depends on the platform. Exposed by the FontWeight attribute of the TextRange Control Pattern implemented on a parent accessible object. May affect on "writing-mode" text attribute on its text container. Exposed as "writing-mode" text attribute on its text container. Descendants of the canvas element are mapped separately. The LabeledBy property for the parent table element points to the UIA element for the caption element. Styles used are mapped into text attributes on its text container.
Styles used are exposed by UIA text attributes of the TextRange Control Pattern implemented on a parent accessible object. Styles used are exposed by text attributes on its text container.
May not have an accessible object if has no semantic meaning. Accessible name derived from figcaption according to the figure Element Accessible Name Computation.
Is there a way to define a default value to be selected in an HTML Form of Radio Buttons? - Stack Overflow
Exposed by the IsItalic attribute of the TextRange Control Pattern implemented on a parent accessible object. See also the Note under img element Accessible Name Computation. Selection for the container and SelectionItem for each color choice.
Depends on UI design of implementation. The UI in Windows 10 Edge, for Example, is a composit of multiple spinners. If represented by a container with a button a text label inside then:.