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+<!DOCTYPE html>
+<title>
+ Single-line row flex fragmentation: Negative margins.
+</title>
+<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#pagination">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
+<style>
+ #flex {
+ display: flex;
+ }
+ #flex > div {
+ width: 25px;
+ background: green;
+ }
+</style>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="width: 100px; height: 100px; columns: 2; column-gap: 0; column-fill: auto; position: relative; background: red;">
+ <div id="flex">
+ <div style="height: 200px;"></div>
+ <div style="height: 210px; margin-top: -10px; break-before: column;"></div>
+ </div>
+ <div style="position: absolute; height: 10px; width: 25px; top: -10px; left: 25px; background: white;"></div>
+</div>