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Test Info:

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<link rel="help" href="https://www.w3.org/TR/css-break-3/">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<style>
#multicol {
writing-mode: vertical-rl;
margin-left: -100px;
columns: 4;
column-fill: auto;
column-gap: 0;
inline-size: 100px;
block-size: 200px;
}
#clipper {
/* Take up all of the first three columns and the half of the last one. */
block-size: 700px;
overflow: clip;
}
.filler {
/* Take us from one fragmentainer and 50px into the next. */
block-size: 150px;
}
.visible {
block-size: 100px;
background: green;
}
.before-fragmentainer-start {
/* This is before the block-start of a fragmentainer, and should therefore
be clipped by #clipper. */
margin-block-start: -100px;
block-size: 50px;
background: red;
}
.after-container-end {
block-size: 100px;
background: red;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="multicol">
<div id="clipper">
<div class="visible"></div>
<div class="filler"></div>
<div class="before-fragmentainer-start"></div>
<div class="visible"></div>
<div class="filler"></div>
<div class="before-fragmentainer-start"></div>
<div class="visible"></div>
<div class="filler"></div>
<div class="before-fragmentainer-start"></div>
<div class="visible"></div>
<div class="after-container-end"></div>
</div>
</div>