I need to understand how the height of the div is computed in the following cases :
<div id="div20" style="font-family:Arial; font-size:50px;line-height:16px;">
<img width="5" height="5">
</div>
On my computer, with chromium, the result is 25 (same as FF).
<div id="div30" style="font-family:Arial; font-size:30px;line-height:16px;">
<span style="font-size:10px">TEXT</span>
</div>
On my computer, with chromium, the result is 23 (same as FF).