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<!DOCTYPE html>
<style>
.row-wrapper, .column-wrapper {
margin: 4px 0;
overflow: auto;
direction: rtl;
border: 2px solid black;
}
.column-wrapper {
width: 300px;
}
.row-wrapper {
height: 300px;
writing-mode: vertical-rl;
}
.column-wrapper > div {
/* This border represents the expected rendering of the testcase's
"margin:4px". This border should occupy the same space as that margin
would, and it should create the same amount of scrollable overflow. (We
can't just use "margin:4px" here, because this reference case uses block
layout, and margins have different behavior with respect to collapsing and
scrollable-overflow impact in block vs. flexbox layout.) */
border: 4px solid white;
height: 30px;
background: #CCC;
}
.h-overflow {
width: 500px;
}
.row-wrapper > div {
/* As noted above, this is a mockup for the "margin:4px" in the testcase. */
border: 4px solid white;
width: 30px;
background: #CCC;
}
.v-overflow {
height: 500px;
}
</style>
<div class=column-wrapper>
<div>one</div>
<div class=h-overflow>two</div>
</div>
<div class=row-wrapper>
<div>one</div>
<div class=v-overflow>two</div>
</div>