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HTML Guide

Free site validation

Find out what web pages on your sites are affected by HTML issues.

Bad value “” for the attribute “xmlns” (only “” permitted here).

The only permitted value for the xmlns attribute is

The namespace declaration for an <svg> element is provided by the xmlns attribute like this:

<svg xmlns="">
  <!-- more tags here -->

Although using https in the URL looks like it’s going to be more secure, in fact this URL is not used to connect it to, only to declare the namespace.

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Related W3C validator issues