Problems

This line enable URL Rewriting . It must be enabled via the RewriteEngine directive! and if your .htaccess file is going to use rewrite rules, you should always include this line. Otherwise, you can’t be sure if its enabled or not. The string “on” is case insensitive.

HTML and XHTML are both languages in which web pages are written. HTML is SGML-based while XHTML is XML-based. They are like two sides of the same coin. XHTML was derived from HTML to conform to XML standards. Hence XHTML is strict when compared to HTML and does not allow user to get away with lapses in coding and structure.

The reason for XHTML to be developed was convoluted browser specific tags. Pages coded in HTML appeared different in different browsers

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

The Most Important Differences from HTML:
Document Structure

    XHTML DOCTYPE is mandatory
    The xmlns attribute in <html> is mandatory
    <html>, <head>, <title>, and <body> are mandatory

XHTML Elements

    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

XHTML Attributes

    Attribute names must be in lower case
    Attribute values must be quoted
    Attribute minimization is forbidden

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