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    HTML 5 Atttribute Reference

    xml:basexml:idxml:langxml:spacexmlns

    XML Attributes in HTML

    In general, namespaces are useful for aggregating together content from different sources. The namespace that qualifies the element names avoids conflicts among the element names from different sources. The global attributes in the XML namespace may be useful when including content from other XML sources or when parsing HTML documents as general-purpose XML. The xmlns attribute is useful for creating other types of objects which can be handled by custom-designed code, using JavaScript for example.

    The xml:base Attribute

    The xml:base HTML attribute

    The xml:base attribute

    Examples

                                     <span ="">...</span>

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    The xml:id Attribute

    The xml:id HTML attribute

    The HTML id attribute serves the same purpose as the xml:id attribute and should be used instead.

    Examples

                                     <span id="elementId-1">...</span>

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    The xml:lang Attribute

    The xml:lang HTML attribute

    The HTML lang attribute serves the same purpose as the xml:lang attribute and should be used instead. However, the prefixed xml:lang attribute is sometimes used on the html element.

    Examples

                                     <dt lang="fr-CA">de rigeur</dt>
                                 
    
                                 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">

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    The xml:space Attribute

    The xml:space HTML attribute

    The xml:space attribute determines whether any white space in the content of the element or its descendants is to be preserved.

    Examples

                                     <span ="">...</span>

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    xmlns Attribute and Prefix

    The xmlns HTML attribute

    The xmlns attribute sets the default namespace URI for the current element and any of its descendants. 

                                     <special xmlns="http://ExampleOnly.com/namespace/">
                                 
    
                                    <p xmlns="http://www.w3.org/1999/xhtml">This paragraph is truly HTML, but its parent is "special".
                                 
    
                                    </p>
                                 
    
                                 </special>

    Although it may be coded at any level, it typically appears only on the top-level html element. The value of the xmlns attribute for HTML tags is http://www.w3.org/1999/xhtml the same as for the 2000 W3C standard HTML. 

                                     <?xml version="1.0" encoding="UTF-8"?>
                                 
    
                                 <!DOCTYPE html>
                                 
    
                                 <html xmlns="http://www.w3.org/1999/xhtml">
                                 
    
                                    ...
                                 
    
                                 </html>

    Using xmlns as a prefix associates a namespace URI with the user-specified namespace prefix following the xmlns: part of the attribute name. 

                                     <special xmlns="http://ExampleOnly.com/namespace/" xmlns:html="http://www.w3.org/1999/xhtml">
                                 
    
                                    <html:p>This paragraph is truly HTML, but its parent is "special".
                                 
    
                                    </html:p>
                                 
    
                                 </special>

    You typically would only see something like this when HTML is aggregated with non-HTML content with element names from a different namespace.

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    Last updated Sunday September 19, 2010

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