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Test Info:

<meta charset="utf-8">↩
div.outer {↩
width: 450px;↩
font-size: 12px;↩
button {↩
font-size: 12px;↩
.invisible {↩
color: white;↩
In a 450px container, the minimum font size at 15em per line is 30px.↩
This means we map 0px-45px into 30px-45px, so 12px gets mapped to 34px.↩
<div class="outer">↩
<form><button>Add Comment</button></form>↩
<p class="invisible">Some text to ensure the button gets inflated - if it↩
isn't size-restricted, that is - but which shouldn't influence the visual↩
result otherwise.</p>↩