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Test Info:
<!DOCTYPE html>
<!-- Any copyright is dedicated to the Public Domain.
<!-- Testcase for how we fragment an empty fixed-height flex container, with
various combinations of margin/border/padding helping it to be too tall,
and with the flex container having "flex-direction: row".
-->
<html>
<head>
<style>
.multicol {
height: 10px;
width: 100px;
column-width: 20px;
column-fill: auto;
border: 2px solid orange;
}
.flexContainer {
display: flex;
flex-direction: row;
background: teal;
/* border-width is 0 by default; some sub-testcases will increase it. */
border: 0 dashed black;
}
</style>
</head>
<body>
<!-- NO BORDERS/PADDING -->
<!-- ================== -->
<!-- content fits exactly into 1 column: -->
<div class="multicol">
<div class="flexContainer" style="height: 10px"></div>
</div>
<!-- content fits, but margin-top pushes it to overflow: -->
<div class="multicol">
<div class="flexContainer" style="height: 9px;
margin-top: 2px;"></div>
</div>
<!-- content is too tall, by 1px: -->
<div class="multicol">
<div class="flexContainer" style="height: 11px"></div>
</div>
<!-- BORDERS/PADDING ON TOP -->
<!-- ====================== -->
<!-- content fits, but border-top makes us too tall: -->
<div class="multicol">
<div class="flexContainer" style="height: 9px;
border-top-width: 2px"></div>
</div>
<!-- content fits, but padding-top makes us too tall: -->
<div class="multicol">
<div class="flexContainer" style="height: 9px;
padding-top: 2px"></div>
</div>
<!-- content fits, but border/padding-top make us too tall: -->
<div class="multicol">
<div class="flexContainer" style="height: 9px;
border-top-width: 1px;
padding-top: 1px"></div>
</div>
<!-- BORDERS/PADDING ON BOTTOM -->
<!-- ========================= -->
<!-- content fits, but border-bottom-width makes us too tall: -->
<div class="multicol">
<div class="flexContainer" style="height: 9px;
border-bottom-width: 2px"></div>
</div>
<!-- content fits, but padding-bottom makes us too tall: -->
<div class="multicol">
<div class="flexContainer" style="height: 9px;
padding-bottom: 2px"></div>
</div>
<!-- content fits, but border/padding-bottom make us too tall: -->
<div class="multicol">
<div class="flexContainer" style="height: 9px;
border-bottom-width: 1px;
padding-bottom: 1px"></div>
</div>
<!-- BORDERS/PADDING ON TOP AND BOTTOM -->
<!-- ================================= -->
<!-- content fits, but border-top/bottom combined make us too tall: -->
<div class="multicol">
<div class="flexContainer" style="height: 9px;
border-top-width: 1px;
border-bottom-width: 1px"></div>
</div>
<!-- content fits, but padding-top/bottom combined make us too tall: -->
<div class="multicol">
<div class="flexContainer" style="height: 9px;
padding-top: 1px;
padding-bottom: 1px"></div>
</div>
</body>
</html>