Difference between HTML to XHTML

Difference between HTML and  XHTML often subtle but marked difference anyway was brilliantly summarised by UK WW member resonate.  A brief highlight of some of the differenced follows:

• Tags must be properly nested: overlapping elements are not allowed
• Tags and attributes must be in lower case
• All elements must be closed
• Attribute values must always be quoted
• Attributes cannot be minimized: For example, <option selected> is incorrect it should be instead: <option selected=”true”>
• ID attribute replaces the Name attribute
• Mandatory elements: XHTML documents require certain mandatory elements. The html, head, body and title elements must exist. Additionally there must be a DOCTYPE declaration.

The Most Important Differences:

• XHTML elements must be properly nested
• XHTML elements must always be closed
• XHTML elements must be in lowercase
• XHTML documents must have one root element

 You can read the full article here

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