listbox-zero-row-initial-ref.html

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<!DOCTYPE HTML>

<title>Reference for initial reflow of zero height options</title>

<style>

  html { overflow: hidden }

  option { height: 0; min-height: 0 }

</style>

<select size="3">

  <option>One</option>

  <option>Two</option>

  <option>Three</option>

</select>

<script>

  document.body.offsetHeight; // flush layout

  document.body.style.fontSize = "60px";

  document.body.offsetHeight; // flush layout

  document.body.style.fontSize = "";

</script>