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What is The Most Important Differences from HTML
  • <!DOCTYPE> is mandatory
  • The xmlns attribute in <html> is mandatory
  • <html>, <head>, <title>, and <body> are mandatory
  • Elements must always be properly nested
  • Elements must always be closed
  • Elements must always be in lowercase
  • Attribute names must always be in lowercase
  • Attribute values must always be quoted
  • Attribute minimization is forbidden




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 HTML vs. XHTML
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 HTML vs. XHTML
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Reffered: https://www.w3schools.com/html/html_xhtml.asp

 

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