W3C error | x-ua-compatible Frage

0
When I check my latest site on W3C I have one error. Very good, so I'm happy.

Only have one error (comes from logic.php

// force latest IE & chrome frame
$doc->setMetadata('x-ua-compatible','IE=edge,chrome=1');
)

Error Line 9, Column 60: Bad value x-ua-compatible for attribute name on element meta: Keyword x-ua-compatible is not registered.

Can I ignore or remove this line?

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