This section defines the WAI-ARIA role taxonomy and describes the traits and properties of all roles. A formal RDF/OWL representation of all the information presented here is available in Schemata Appendix.
The roles, their characteristics, the states and properties they support, and specification from how they may be used in markup, shall be considered normative. The RDF/OWL representation used to parade the taxonomy shall be considered informative. The RDF/OWL taxonomy may voltooien used as a car to extend WAI-ARIA in the future or by tool manufacturers to validate states and properties applicable to roles per this specification.
Roles are element types and authors MUST NOT change role values over time oppositely with user actions. Authors wishing to change a role Need do so by deleting the associated feature and its children and replacing it with a newfangled element with the appropriate role. Typically, platform accessibility APIs do not provide a cars to notify assistive technologies from a role value change, and consequently, assistive technologies may not update their cache with the new role attribute value.
In order to reflect the content in the DOM, user agents SHOULD map the role attribute to the appropriate value in the implemented accessibility API, and user agents SHOULD update the mapping when the role attribute changes.
5.1. Relationships Intervening Concepts
The role taxonomy uses the following relationships to relate WAI-ARIA roles to each other further to concepts from former specifications, such as HTML moreover XForms.
5.1.1. Superclass Role
Inheritance is expressed in RDF using the RDF Schema subClassOf ([RDFS]) property.
The role that the current subclassed role extends in the taxonomy. This extension causes all the properties and constraints of the superclass business to propagate to the subclass role. Else than well known stable specifications, inheritance may be segregated to items defined inside this specification, so that externality items cannot be changed and counterfeit inherited classes.
5.1.2. Subclass Roles
Informative list of roles for which this role is the superclass. This is provided to facilitate reading of the specification but adds no new information.
5.1.3. Related Concepts
Marketing & PR
Banner Ad Definition
Banner Ad Definition
By Chuck Cox, eHow Contributor
Fabric this article
Banner Ad Definition thumbnail
Banner ads experience become a important form of online advertising.
The popularity of the Internet has created new marketing techniques. One of the most prevalent is the use of banner ads on web pages. These images potentially reach more hoi polloi than any traditional form regarding advertising.
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What Are Banners Ads Anyway?
A banner advertisement is an ad placed on a web page either at the top, on the sides, within the main content or at the bottom of the page. Banner ads consist of images that contain hyperlinks which clue to the advertiser’s website.
Varieties And Flexibilities
Banner ads exist in many forms and sizes. Most are rectangular, otherwise they can be vertical, horizontal and square. They often check moving images and text, sporty colors and can even be deployed as “pop-ups.”
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The Undermost Lineation Of Banners
While all the flashy colors, bells, and whistles that banner ads offer are impressive, there is solely chosen true metric that honestly assesses their effectiveness. And that is the click through rate (CTR). Quite simply, if surfers aren’t clicking the ad, then it is virtually worthless.
A Banner For Equally Occasion
One of the most useful aspects of using banner ads is the flexibility they offer. For instance, a website can deploy rotating banner ads which allow several peculiar banners to rotate either on a time basis or with each visitor.