Bad value X-UA-Compatible for attribute http-equiv on element meta
Bad value X-UA problem
When you are using the tag “X-UA-Compatible” meta in header-file, you might had been forced to conquer this “problem” when validating your site using W3Schools. Well, I had.
There is a short solution
You can to comment the original line and test it by yourself. You can send these meta value with PHP via HTTP headers instead. That’s it!
<?php header('X-UA-Compatible: IE=edge,chrome=1'); ?> <!--<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />-->
Now validate your code!