<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>high contrast mode should cause a black box to be drawn</title> <style type="text/css"> div { width: 100px; height: 100px; } @media (prefers-contrast: more) { div { outline: 2px solid #000000; } } </style> </head> <body> <div></div> </body> </html>