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Test Case: http://www.hixie.ch/tests/evil/mixed/hrbrstyles.html
Edit the second example (in webkit for example), set inline style: margin: 1em 0 (like in the boilerplate css), now give it a width of 100px. It will align left.
If you do the same thing in IE(7,8, yet to test IE6) it will align center, because it uses text-align internally rather than margin (as should be according to the HTML5 spec) . Adding text-align: left fixes this.
http://www.w3.org/TR/html5/rendering.html#the-hr-element-0