Error found while checking this document as XHTML 1.0 Transitional!

Result: 1 Error
:
: utf-8
: XHTML 1.0 Transitional
Root Element: html
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Validation Output: 1 Error

  1. Error Line 2, Column 1: Missing xmlns attribute for element html. The value should be: http://www.w3.org/1999/xhtml 
    <html>

    ✉

    Many Document Types based on XML need a mandatory xmlns attribute on the root element. For example, the root element for XHTML might look like:
    <html xmlns="http://www.w3.org/1999/xhtml">

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