<!DOCTYPE HTML> <title>CSS Test: font-size: 0</title> <link rel="author" title="L. David Baron" href="https://dbaron.org/"> <link rel="author" title="Mozilla" href="http://www.mozilla.org/"> <link rel="help" href="http://www.w3.org/TR/css3-fonts/#font-size-prop"> <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#collapsing-margins"> <link rel="match" href="font-size-zero-1-ref.html"> <meta name="flags" content=""> <style> /* spec ambiguous whether font-size-adjust influences line-height: normal */ body { line-height: 1.2 } p { margin: 1em 0 } p.zero { font-size: 0 } </style> <p>before</p> <p class="zero">zero</p> <p>after</p>