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Test Info:

<style>
.multicol-a {
width: 300px;
column-width: 100px;
column-gap: 0;
height: 100px;
}
.multicol-b {
border: 1px solid silver;
width: 200px;
column-width: 51px;
column-gap: 0;
height: 50px;
}
.step {
height: 1px;
}
.float-L {
width: 1px;
height: 1px;
float: left;
}
.float-R {
width: 1px;
height: 26px; /* 25 -> 26 crash */
}
</style>
<div class="multicol-a">
<div class="float-R"></div>
<div class="multicol-b">
<div class="step"></div>
<div>
<div class="float-L"></div>
<div>
</div>
</div>