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Test Info:

<!DOCTYPE html>
<link rel="author" title="David Grogan" href="mailto:dgrogan@chromium.org">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<meta name="assert"
content="safe flex-start allows for overflow past the end edge, which is bottom/right in the case of wrap-reverse + vertical-lr" />
<style>
#reference-overlapped-red {
position: absolute;
background-color: red;
width: 100px;
height: 100px;
z-index: -1;
}
.flex {
display: flex;
flex-flow: wrap-reverse;
writing-mode: vertical-lr;
inline-size: 90px;
block-size: 90px;
align-content: safe flex-start;
justify-content: safe flex-start;
}
.item {
flex: 0 0 100px;
width: 100px;
height: 100px;
background: green;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.
</p>
<div id="reference-overlapped-red"></div>
<div class="flex">
<div class="item"></div>
</div>