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<head>
<meta name="viewport" content="width=device-width">
<style>
body {
width: 100%;
height: 100%;
margin: 0;
}
#source, #destination {
width: 100%;
height: 200px;
font-size: 200px;
white-space: nowrap;
}
#destination {
border: black 1px solid;
}
</style>
</head>
<body>
<div id="source">Hello world</div>
<textarea id="destination"></textarea>
<script>
let text = source.childNodes[0];
getSelection().setBaseAndExtent(text, 0, text, text.data.length);
</script>
</body>
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