<!DOCTYPE html> <meta charset=utf-8> <title>Test for logical margins on hr elements in the UA style sheet</title> <style> .v-rl { writing-mode: vertical-rl; } .ltr, .rtl, .v-rl { border: 1px solid blue; } hr { width: 100px; height: 100px; } .ltr hr { margin: 0.5em auto; } .rtl hr { margin: 0.5em auto; } .v-rl hr { margin: auto 0.5em; } </style> <div class=ltr> <hr> </div> <div class=rtl dir=rtl> <hr> </div> <div class=v-rl> <hr> </div>