internet explorer - Why isn't my CSS working in IE 8 and IE 7? -

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what in css doesn't work in ie8 & ie7? 

nav { position: fixed; top:60px; left:30px; color:black; float:left; } nav div#button {     width:205px;     height:50px;     text-align: center;     padding-top:  5px;     margin-bottom:10px;      font-size: 23px; } nav {     color: #000000;     text-decoration: none; } nav div#button:active  {     width:250px;     height:65px; } nav div#button.home {     background-color: #79b22c; } nav div#button.links {     background-color: #3b50cc; } nav div#button.aanbod {     background-color: #ba3bcc; } nav div#button.forum {     background-color: #1caeb2; } nav div#button.contact {     background-color: #daa520; }

it works fine in ie9 & ie10. ie8 & ie7 displays no-styled text. have tested browserstack. can me please?

<nav> , other html5 elements defined after ie 7 , ie 8 released, browsers aren't aware of how handle them.

they can, however, instructed handle them. and, html5shiv can this:

include html5 shiv @ top of <head> in conditional comment after stylesheets.

<!--[if lt ie 9]>     <script src="html5shiv.js"></script> <![endif]-->

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