In reply to mark k..

This is kind of telling:

Core has to have some useless feature every release, this is the useless feature of 4.5 :(, This feature is designed with the best practices of 2010 instead of 2016. There is no way to add a retina enhanced versions of the logo and no way to add “mobile” version, so this feature is not “responsive” nor retina friendly by design.

Before the last update of WordPress, my video embeds were all fully responsive. The video screen would adapt to browser screen.

Now? If I visit my blog on mobile, video embeds (using the new oAuth embed option with just a link) display outside the window.

I thought it was just a glitch, but now I'm beginning to think less so.

And no retina display option in 2016? Ugh.