<style>
span {
display: inline-block;
font-size: 12px;
}
</style>
<div>
<span>hello </span>
<span>world</span>
</div> 
where did the extra height come from?
<style>
span {
display: inline-block;
font-size: 12px;
}
</style>
<div>
<span>hello </span>
<span>world</span>
</div>
where did the extra height come from?
you can tell where it came from by setting the line-height of div to 1em.
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