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<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<style>
@page {
margin: 0;
}
body {
margin: 0;
}
</style>
<div style="margin:0 4em;">
<div style="height:4em; background:lime;"></div>
The background of the top page margin area should be lime.
</div>