I should work, and study the previous post answers, still, I'm also trying to 
understand this (no floats involved issue) :)


Please check the following test case:

http://jsfiddle.net/NU3ZR/


This works, but I don't understand what is the role of left: 0; here.

Obviously (or not), I tried to make: left: 50%; but the triangle don't get 
centered as expected.
It only gets centered when we:
1) place that left: 0%; (and perhaps (not tested) to 100%);
2) define the background image to be horizontal positioned to 50%;

Can anyone please care to clarify what's the role of left:0; here ?



k. regards,
mem

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