id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc,focuses 46015,Remove any CSS related to Internet Explorer 6 – 8,afercia,ocean90,"Splitting this out from #46003. More than one year ago, with the 4.8 release, WordPress [https://make.wordpress.org/core/2017/04/23/target-browser-coverage/ officially ended support for Internet Explorer versions 8, 9, and 10]. However, the WordPress admin CSS is still targeting old IE versions, even IE 6. It is true that in the admin some of these rules are only served to old IE versions via conditional comments. There are many other rules targeting IE 7 and IE 8 polluting styesheets served to all browsers though. Not to mention the majority of the bundled themes. As far as I can tell, Twenty Nineteen is the first bundled theme to not use conditional comments. At the very least, I'd like to propose to remove any admin CSS targeting IE 6 – 8. That would require to: - remove `wp-admin/css/ie.css` - remove the conditional comments - remove any CSS rule that use selectors with `.ie7` and `.ie8`. - check if anything else is needed As mentioned in #46003, some of the related CSS is served also in the front end. For example, the CSS related to the admin bar, when users are logged in, and the media views, when enqueued in the front end. It would be great to consider to do the same also for the JavaScript part. That would certainly be a bit more complicated and I guess it needs to be considered separately. Instead, the CSS part seems easy enough to address. /Cc @swissspidy",enhancement,closed,normal,5.5,Administration,,normal,fixed,has-patch commit,,"css, performance"