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what are the advantages of using text-alignment:justify; over left,right and center?
in which cases it is better to use justify?
Justified text forces each line of text to have equivalent lengths by affecting the spacing between words. Justified text is typically left aligned. Justified text looks almost like a square.
Left align by itself forces text to be aligned to the left hand side of the page but only the left hand side is equally aligned, the right hand side will be noticeably different because no change has been made to character spacing. The right hand side will wrap when words get too long.
Right align does the same thing as left align except that the right hand side is equally aligned and the left hand side will wrap when words are too long.
Center align centers text on the page and neither the left or right side will be equally aligned.
Here is a demo page so that you can visually see how Justified looks over Left align: http://codepen.io/anon/pen/zxqjZV