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XHTML 3
What is XHTML? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Why XHTML?  ,[object Object],[object Object],[object Object],[object Object],[object Object]
How is XHTML better than HTML?  ,[object Object],[object Object],[object Object],[object Object],[object Object]
Differences Between XHTML and HTML  ,[object Object],[object Object],[object Object],[object Object],[object Object]
Elements Must Be Properly Nested ,[object Object],[object Object],[object Object],[object Object],[object Object]
Documents Must Be Well-formed ,[object Object],[object Object],[object Object],<html> <head> ... </head> <body> ... </body> </html>
Tag Names Must Be in Lower Case ,[object Object],[object Object],[object Object]
All XHTML Elements Must Be Closed ,[object Object],[object Object],[object Object],This is a break<br /> Here comes a horizontal rule:<hr />Here's an image <img src=&quot;happy.gif&quot; alt=&quot;Happy face&quot; />
XHTML Syntax  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Attribute Minimization is Forbidden
The id Attribute replaces the Name Attribute ,[object Object],[object Object],[object Object],[object Object]
Mandatory XHTML Elements ,[object Object],[object Object],<?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?>  <!DOCTYPE html PUBLIC &quot;-//W3C//DTD XHTML 1.0 Transitional//EN&quot; &quot;http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd&quot;> <html xmlns=&quot;http://www.w3.org/1999/xhtml&quot; xml:lang=&quot;en&quot; lang=&quot;en&quot;>  <head> <title>... </title> </head> <body> ... </body> </html>
XHTML Document Type Definitions (DTD)  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The 3 Document Type Definitions  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],<!DOCTYPE html PUBLIC &quot;-//W3C//DTD XHTML 1.0 Transitional//EN&quot; &quot;http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd&quot;>
XHTML Validation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
W3C Recommendations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
… W3C Recommendations ,[object Object],[object Object],[object Object],[object Object],[object Object]
… W3C Recommendations ,[object Object],[object Object],[object Object],[object Object]
Reading List ,[object Object]

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