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<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<link rel="help" href="https://www.w3.org/TR/CSS22/visudet.html#blockwidth">
<style>
html {
width: 100px;
margin-left: auto;
}
body { /* Just to make testharness display nicely. */
position: absolute;
left: 0;
right: 0;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(()=> {
var viewport_width = window.innerWidth;
var html = document.documentElement;
assert_equals(html.offsetLeft, viewport_width - 100);
}, "Root element auto margins resolve");
</script>
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