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HTML Components

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Custom Tags and Namespaces

HTCs are based on custom tags which were first introduced in IE 5.0. They allow Web authors to introduce structure to a document while associating style with that structure. For example, you can define a new tag, <RIGHT>, which right-justifies a paragraph:

<HTML XMLNS:DOCJS>
<HEAD>
<STYLE>
@media all {
  DOCJS\:RIGHT {text-align:right; width:100}
}
</STYLE>
</HEAD>
<BODY>
<DOCJS:RIGHT>
 Read Doc JavaScript's columns, tips, tools, and tutorials
</DOCJS:RIGHT>
</BODY>
</HTML>

Internet Explorer's support for custom tags on an HTML page requires that a namespace be defined for the tag. Custom tags definition is based on XML syntax and the namespace is an XML namespace. As shown above, the namespace we use is DOCJS: 

<HTML XMLNS:DOCJS>

XMLNS stands for XML NameSpace. We defined a custom tag called RIGHT. Every use of this tag should be prefixed by the appropriate XML namespace, to create the new tag DOCJS:RIGHT. If namespaces are not defined, the custom tag is treated as an unknown tag when the document is parsed. Although navigating to a page with an unknown tag does not result in an error, the new custom tag is not able to contain other tags, nor can behaviors be applied to it. It is also possible to define multiple namespaces on a single HTML tag:

<HTML XMLNS:DOCJS XMLNS:DOCJAVASCRIPT>

Next: How to write the application's top-level page

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Intel Whitepaper: Comparing Two- and Four-Socket Platforms for Server Virtualization
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Microsoft PDF: Top 10 Reasons to Move to Server Virtualization with Hyper-V
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Microsoft Step-by-Step Guide: Hyper-V and Failover Clustering
Intel PDF: Quad-Core Impacts More Than the Data Center
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Go Parallel Article: PDC 2008 in Review
Microsoft PDF: Top 11 Reasons to Upgrade to Windows Server 2008
Avaya Article: Communication-Enabled Mashups: Empowering Both Business Owners and IT
Intel Whitepaper: Building a Real-World Model to Assess Virtualization Platforms
   PDF: Intel Centrino Duo Processor Technology with Intel Core2 Duo Processor
Microsoft Article: Build and Run Virtual Machines with Hyper-V Server 2008
Go Parallel Article: Q&A with a TBB Junkie
IBM Whitepaper: Innovative Collaboration to Advance Your Business
Internet.com eBook: Real Life Rails
IBM eBook: The Pros and Cons of Outsourcing
Internet.com eBook: Best Practices for Developing a Web Site
IBM CXO Whitepaper: The 2008 Global CEO Study "The Enterprise of the Future"
Avaya Article: Call Control XML in Action - A CCXML Auto Attendant
IBM CXO Whitepaper: Unlocking the DNA of the Adaptable Workforce--The Global Human Capital Study 2008
Adobe Acrobat Connect Pro: Web Conferencing and eLearning Whitepapers
HP eBook: Guide to Storage Networking
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IBM e-Kit: Reduce Complexity and Cost with BladeCenter
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Access Crystal Reports for Eclipse Basic Edition (Free)
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Tutorials and Demos

VMware Online Virtualization Forum: Learn about the benefits of a virtual infrastructure, network with industry experts--Register today!
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IBM IT Innovation Article: Green Servers Provide a Competitive Advantage
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Created: July 3, 2000
Revised: July 3, 2000

URL: http://www.webreference.com/js/column64/3.html