The media modal, attachment details modal, and link modal all have scrolling problems on mobile/touch devices. The page beneath them scrolls, resulting in stacked scrolling and a bad experience.

Nexus 5 Media Modal:

Nexus 5 Link Modal:

Nexus 5 Attachment Details Modal:

iPhone 5, all three modals:

#android, #ios, #links, #media, #modal, #phone, #scroll-bleed, #web