[javascript] Hide div after a few seconds

This will hide the div after 1 second (1000 milliseconds).

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setTimeout(function() {_x000D_
    $('#mydiv').fadeOut('fast');_x000D_
}, 1000); // <-- time in milliseconds
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#mydiv{_x000D_
    width: 100px;_x000D_
    height: 100px;_x000D_
    background: #000;_x000D_
    color: #fff;_x000D_
    text-align: center;_x000D_
}
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<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<div id="mydiv">myDiv</div>
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If you just want to hide without fading, use hide().