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This is wrong:
<img src="picture.gif" name="picture1"/>
This is correct:
<img src="picture.gif" id="picture1"/>
(To interoperate with older browsers for a while, you can try to use both name and id, with identical attribute values). IMPORTANT Compatibility Note: To make your XHTML compatible with today's browsers, you should add an extra space before the "/" symbol like this: <img src="picture.gif" id="picture1" /> Script and Style elements In XHTML the characters like "<" and "&" are treated as a part of the markup. To avoid this inside scripts or other elements, wrap the content with a CDATA definition like this: <script> <![CDATA[ ... script content ... ]]> </script> Documents must conform to XML rules Since XHTML documents are XML applications, XHTML documents must conform to the following XML rules: Elements must be properly nested In HTML some elements can be improperly nested within each other like this: <b><i>This text is bold and italic</b></i> In XHTML all elements must be properly nested within each other like this <b><i>This text is bold and italic</i></b> Documents must be well-formed All XHTML elements must be nested within the <html> root element. All other elements can have sub (children) elements. Sub elements must be in pairs and correctly nested within their parent element. The basic document structure is: |