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+<!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="help" href="https://www.w3.org/TR/css-overflow-3/#overflow-properties">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<style>
+ #multicol {
+ writing-mode: horizontal-tb;
+ 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>