This code is not correct:
<center><img src="http://moviemezzanine.com/wp-content/forum/uploads/wrestler-1-1140x702.jpg" alt="null"></center>
MDN documentation:
Deprecated
This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Do not use it in old or new projects. Pages or Web apps using it may break at any time.
Cheers and happy coding 
Thanks!!! I will be careful next time!
And I deleted the line in my code!
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