<!DOCTYPE html> <html> <head> <title>background-position-x: initial on top of 4-value background-position</title> <style> body { margin: 0 } .test1 { height: 200px; width: 200px; background-image: url(../../css3/images/resources/red-100.png); background-repeat: no-repeat; /* Intended to be overwritten: */ background-position: bottom 0% right 0px; } .test2 { /* The background-position to be used: */ background-position-x: initial; } .ref { height: 100px; width: 100px; top: 100px; left: 0; background-color: green; position: absolute; } </style> </head> <body> <div class="test1 test2"></div> <div class="ref"></div> </body> </html>