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flexbox-min-height-auto-001.html
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flexbox-min-height-auto-001.html
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<!DOCTYPE html>
<!--
Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/
-->
<html>
<head>
<meta charset="utf-8">
<title>CSS Test: Testing min-height:auto</title>
<link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
<link rel="help" href="http://www.w3.org/TR/css-flexbox-1/#min-size-auto">
<link rel="match" href="flexbox-min-height-auto-001-ref.html">
<!--
This testcase tests the used value of "min-height:auto" (the property's
initial value) on flex items in a vertical flex container.
It's supposed to resolve to the smallest of:
a) The used 'flex-basis' (taken from 'height'), if 'flex-basis' is at its
initial value.
b) The computed 'max-height' property
c) If there's no intrinsic aspect ratio: the item's min-content height.
d) If there is an intrinsic aspect ratio: the item's height derived from
the ratio & constraints in the other dimension.
We measure what the used value is by putting flex items in a small flex
container, which will shrink its items down to their min-height.
This test checks for situations where we should resolve the min-height as
(a), (b), or (c) above. Another test will check (d).
-->
<style>
.flexbox {
display: flex;
flex-direction: column;
height: 1px; /* No available space; shrink flex items to min-height */
margin-right: 2px; /* (Just for spacing things out, visually) */
float: left;
}
.flexbox > * {
/* Flex items have purple border: */
border: 2px dotted purple;
}
.flexbox > * > * {
/* Flex items' contents are gray & fixed-size: */
background: gray;
width: 10px;
height: 80px;
}
</style>
</head>
<body>
<!-- Check for min-height:auto resolving correctly when the smallest
candidate value is: -->
<!-- *** (a) Used 'flex-basis' (from 'height') *** -->
<!-- First, without definite max-height: -->
<div class="flexbox">
<div style="height: 50px"><div></div></div>
</div>
<!-- ...and now with definite (& large) 'max-height': -->
<div class="flexbox">
<div style="height: 50px; max-height: 120px;"><div></div></div>
</div>
<!-- ...and now with used 'flex-basis' being a calc expression:-->
<div class="flexbox">
<div style="height: calc(10% + 50px)"><div></div></div>
</div>
<!-- *** (b) The computed 'max-height' *** -->
<!-- First, with a larger candidate 'flex-basis' value (from 'height') -->
<div class="flexbox">
<div style="height: 100px; max-height:50px"><div></div></div>
</div>
<!-- ...and now with a larger explicit 'flex-basis' value (which shouldn't
be considered for 'min-height:auto' anyway) -->
<div class="flexbox">
<div style="flex-basis: 100px; max-height:50px"><div></div></div>
</div>
<!-- ...and now with a smaller explicit 'flex-basis' value (which shouldn't
be considered for 'min-height:auto' anyway) -->
<div class="flexbox">
<div style="flex-basis: 10px; max-height:50px"><div></div></div>
</div>
<!-- *** (c) (no intrinsic aspect ratio) The min-content size *** -->
<!-- First, with a larger candidate 'flex-basis' value (from 'height') -->
<div class="flexbox">
<div style="height: 100px"><div></div></div>
</div>
<!-- ...and now with a larger explicit 'flex-basis' value (which shouldn't
be considered for 'min-height:auto' anyway) -->
<div class="flexbox">
<div style="flex-basis: 100px"><div></div></div>
</div>
<!-- ...and now with a smaller explicit 'flex-basis' value (which shouldn't
be considered for 'min-height:auto' anyway) -->
<div class="flexbox">
<div style="flex-basis: 10px"><div></div></div>
</div>
</body>
</html>