1 . Which security protocol or measure would provide the greatest protection for a wireless LAN? WPA2 cloaking SSIDs shared WEP key MAC address filtering 2 . Refer to the exhibit. All trunk links are operational and all VLANs are allowed on all trunk links. An ARP request is sent by computer 5. Which device or devices will receive this message? only computer 4 computer 3 and RTR-A computer 4 and RTR-A computer 1, computer 2, computer 4, and RTR-A computer 1, computer 2, computer 3, computer 4, and RTR-A all of the computers and the router 3 . Refer to the exhibit. Hosts A and B, connected to hub HB1, attempt to transmit a frame at the same time but a collision occurs. Which hosts will receive the collision jamming signal? only hosts A and B only hosts A, B, and C only hosts A, B, C, and D only hosts A, B, C, and E 4 . Refer to the exhibit. Router RA receives a packet with a source address of 192.168.1.65 and a destination address of 192.168.1.161...
The Short Version:
ReplyDeleteThe Role Attribute may give future browsers a way to work intelligently with certain XML elements in a device-independent way. For example, an unordered list that is marked with the role attribute of "navigation" can be interpreted intelligently on browsers in both desktop and handheld environments, allowing it to be displayed clearly in both environments.
The Long Version:
The XHTML Role Attribute defined in this specification allows the author to annotate XML Languages with machine-extractable semantic information about the purpose of an element. Use cases include accessibility, device adaptation, server-side processing, and complex data description.
The attribute describes the role(s) the current element plays in the context of the document. This can be used, for example, by applications and assistive technologies to determine the purpose of an element. This could allow a user to make informed decisions on which actions may be taken on an element and activate the selected action in a device independent way. It could also be used as a mechanism for annotating portions of a document in a domain specific way (e.g., a legal term taxonomy).
Example:
<ul role="navigation sitemap">
<li href="downloads">Downloads</li>
<li href="docs">Documentation</li>
<li href="news">News</li>
</ul>
Given that the XHTML2 Working Group will cease to exist at the end of this year, there's no chance of this specification ever reaching release status in anything resembling its current form. http://www.w3.org/News/2009#entry-6601
The document you refer to is part of the work of the now discontinued XHTML 2 working group. It is effectively obsolete.
ReplyDeleteHTML5/XHTML5 also has a "role" attribute. Its definition is similar but somewhat more limited - its purpose is to indicate Accessible Rich Internet Applications (ARIA) roles, so that assistive technology such as screen readers can better inform users about the purpose of UI components (widgets), and also help them navigate the web page more easily.
The list of valid roles for ARIA is available at http://www.w3.org/TR/wai-aria/#roles