text-align: -webkit-center vs text-align: center

Question

Does anyone know why there is a difference between text-align: center and , text-align:-webkit-center ? For example if you have :

 
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Answer 1

The text-align CSS property describes how inline content like text is aligned in its parent block element. text-align does not control the alignment of block elements, only their inline content.

text-align: -moz-center;
text-align: -webkit-center;