This page has a purple background set in the external style sheet. It has red specified in the page head. The page head style is overridden by the external style, because the style sheet link follows the page head style in the code, like so:
<style type="text/css">
<!--
body {
background-color: red;
color: #fff;
margin: 20px 100px;
}
-->
</style>
<link href="override.css" rel="stylesheet" type="text/css" />
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