html - z-index and anchor tag -

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i have div position relative , z-index :-1. , have placed <a> on div. seems <a> not working when give postion :relative parent. when change position absolute starts working. tell me why happening. want link work , far possible need keep parent div position :relative , z-index:-1;

position:relative make z-index relative parent.

http://www.w3.org/tr/css21/visuren.html#propdef-z-index


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