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<!DOCTYPE html>
<style>
div:before { position: absolute; content: 'x'; }
</style>
<!--
<img usemap="#map1">
<map>
<caption>
<map name=child-map>
yz
</map>
</caption>
</map>
-->
<script>
window.addEventListener('load', () => {
const caption = document.createElement('caption');
const childMap = document.createElement('map');
childMap.setAttribute('name', 'child-map');
const map2 = document.createElement('map');
document.documentElement.appendChild(map2);
const img = document.createElement('img');
img.setAttribute('usemap', '#child-map');
childMap.appendChild(document.createTextNode('yz'));
document.documentElement.appendChild(img);
caption.appendChild(childMap);
map2.appendChild(caption);
});
</script>
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