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<!DOCTYPE html>
<html>
<body>
<div id="source" style="width: 3ch"></div>
<div id="target" style="width: 0">
This is a test
</div>
<script>
document.getElementById("target").style.lineHeight =
document.defaultView
.getComputedStyle(document.getElementById("source")).width;
</script>
</body>
</html>