css selectors - :nth-child(3n):after cleafix not working in CSS -

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hello there have tried following think should valid css , not work (tested google chrome).

<ul> <li><a href="...">bla</a></li> <li><a href="...">bla</a></li> <li><a href="...">bla</a></li> <li><a href="...">bla</a></li> <li><a href="...">bla</a></li> </ul>

the css:

ul li {     float:left; }  ul li:nth-child(3):after {     content:"";     display:table;     clear:both; }

the floating list elements should start new row after each third element in list within responsive design. have solution suggestion? isnt supposed work?

just apply below.

 ul li:nth-child(4n) {clear:both;}

demo


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