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<!DOCTYPE html>
<link rel="help" href="https://html.spec.whatwg.org/C/#the-fieldset-and-legend-elements">
<!-- A test for the following paragraph:
For the purpose of calculating the used 'block-size', if the computed
'block-size' is not 'auto', the space allocated for the rendered legend's
margin box that spills out past the border, if any, is expected to be
subtracted from the 'block-size'. If the content box's block-size would be
negative, then let the content box's block-size be zero instead.
-->
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
fieldset {
margin: 0;
padding: 0;
border: 2px solid black;
}
legend {
height: 102px;
background-color: yellow;
}
.content {
background-color: lime;
}
</style>
<fieldset style="block-size: 200px;">
<legend>Legend</legend>
<div class="content" style="height:100%"></div>
</fieldset>
<fieldset style="block-size: 40px;">
<legend>Legend</legend>
<div class="content" style="height:100%"></div>
</fieldset>
<script>
test(() => {
let cs = document.querySelectorAll('.content');
assert_equals(cs[0].offsetHeight, Math.max(202 - 102, 0));
assert_equals(cs[1].offsetHeight, Math.max(42 - 102, 0));
}, 'Test content\'s block-size');
</script>
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