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  • XHTML or Extensible HyperText Markup Language is the successor to HTML. It's a reformulation

  • of HTML using XML and is therefore almost identical. However, XHTML is stricter so there

  • are a few differences that we need to look at.

  • First, XHTML requires all elements to be closed. So previous optional end tags must be included

  • and elements that does not have an end tag gets one in the start tag by adding a forward

  • slash.

  • Secondly, XHTML is lowercase-only for all tag and attribute names.

  • And all attributes must have a value specified. For attributes that don't have any values

  • this means that they must use their own names as their value. Also, double quotes are required

  • around all values.

  • It's recommended that we specify an XML namespace using the xmlns attribute. By placing this

  • attribute within the <html> tag we decide the namespace used throughout the document.

  • This attribute can be placed within any element to define one or more alternative namespaces

  • within our document.

  • There is also an optional line that we can place at the first line of the document. This

  • XML directive tells the browser that we are using the current version 1.0 of XML along

  • with the common 8-bit Unicode character set.

XHTML or Extensible HyperText Markup Language is the successor to HTML. It's a reformulation

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