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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {
font-size: 200px;
}
#offscreen {
position: absolute;
top: -500vh;
left: -500vw;
}
</style>
</head>
</body>
<div id="onscreen">DRAG ME</div>
<div id="offscreen">FAR OFFSCREEN</div>
<script>
function selectChildNodesOfElement(element)
{
let range = document.createRange();
range.setStartBefore(element.childNodes[0])
range.setEndAfter(element.childNodes[element.childNodes.length - 1]);
getSelection().removeAllRanges();
getSelection().addRange(range);
}
selectChildNodesOfElement(onscreen);
document.body.addEventListener("dragstart", () => selectChildNodesOfElement(offscreen));
</script>
</body>
</html>
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