HTML and XHTML

What Is XHTML?

  • XHTML stands for EXtensible HyperText Markup Language
  • XHTML is almost identical to HTML
  • XHTML is stricter than HTML
  • XHTML is HTML defined as an XML application
  • XHTML is supported by all major browsers 

Why XHTML?

Many pages on the internet contain "bad" HTML.
This HTML code works fine in most browsers (even if it does not follow the HTML rules):

<html>
<head>
  <title>This is bad HTML</title>

<body>
  <h1>Bad HTML
  <p>This is a paragraph
</body>

<!DOCTYPE ....> Is Mandatory

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>
  <title>Title of document</title>
</head>

<body>
  some content 
</body>

</html>


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