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Test Info:

<!DOCTYPE html>
<style>
div {
height: 240px;
}
#f {
height: 0;
overflow: hidden;
padding: 0;
border: none;
}
</style>
There should be a visible fieldset below:
<div>
<fieldset id="f">This is fieldset</fieldset>
</div>
<script>
h = document.body.clientHeight;
f.style.height = "auto";
</script>