HTML as common glue
Netscape and Opera use namespace URIs
Both Netscape and Opera recognize HTML elements in the namespace "http://www.w3.org/TR/REC-html40". (To conform with XHTML, it should be ""http//www.w3.org/1999/xhtml"", but Opera doesn't yet support that.) This means that the crucial
img elements are available for Web page layout, along with HTML tables.
Microsoft uses fixed html: prefix
Microsoft will let you use any URI you like, provided that the prefix used on the elements is html:. As a result, declaring
xmlns:html="http://www.w3.org/TR/REC-html40" allows documents which use both XML and HTML.
Moving toward an XHTML base?
XHTML is the W3C's effort to place the HTML vocabulary on an XML foundation. It's far more formal than the ad hoc approach outlined above, but it could conceivably build on this approach.
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