I would like to know why so common elements such as Marquee and ShareIt Button, which can be found in hundreds of sites, and work perfectly in browsers are reported as error. My site was generated with WYSIWYG Web Builder, works perfectly and I have not written a single line HTML code. So surprised that you found mistakes in it accountable.
With pleasure I would put your logo on my page, but these errors are disturbing trade.
Please explain or make recommendations on how it should look in your code.

Athens, Greece
+30 210 90 18 320

thank you