Solve error from Bas Willemse | ReisStore.nl on 2012-10-13 (www-validator@w3.org from October 2012)

From: Bas Willemse | ReisStore.nl <info@reisstore.nl>
Date: Sat, 13 Oct 2012 13:42:46 +0200
To: www-validator@w3.org
Message-Id: <F337C695-F394-4F74-84DD-886FBF31E397@reisstore.nl>

How can we solve this problem: 

Line 3, Column 1: Missing xmlns attribute for element html. The value should be: http://www.w3.org/1999/xhtml
<html lang="en" class="no-js">
✉
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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Received on Monday, 15 October 2012 07:56:33 UTC