This function should take care for the input into the head of each page/post as asked.
Please make a copy of
functions.phpbefore adding following code.
Adjust to your own preferences if needed.
/**
* Add meta to head
*
* Read more {@link https://codex.wordpress.org/Plugin_API/Action_Reference/wp_head}
* @version WordPress 4.8
*/
function wpse272951_wsm_keep_ie_modern()
{
echo "<meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\"/> \n";
}
add_action( 'wp_head', 'wpse272951_wsm_keep_ie_modern' );
PS, it should not be added into the header as mentioned by you but into the head of a page between <head> </head> (which will be done by this function automatically).
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