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+<!DOCTYPE html>
+<title>
+ Multi-line column 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-direction: column;
+ flex-wrap: wrap;
+ height: 500px;
+ }
+ #flex > div {
+ height: 100px;
+ width: 10px;
+ }
+ #flex > div:nth-child(odd) {
+ background: green;
+ margin-top: -100px;
+ break-before: column;
+ }
+</style>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="height: 100px; width: 100px; background: red; position: absolute">
+ <div style="position: absolute; left: 10px; width: 10px; height: 100px; background: green;"></div>
+ <div style="margin-top: 100px; width: 100px; height: 100px; columns: 5; column-gap: 0; column-fill: auto;">
+ <div id="flex">
+ <div></div>
+ <div></div>
+ <div></div>
+ <div></div>
+ <div></div>
+ <div></div>
+ <div></div>
+ <div></div>
+ <div></div>
+ <div></div>
+ <div style="background: white;"></div>
+ <div></div>
+ <div></div>
+ <div></div>
+ <div></div>
+ <div></div>
+ <div></div>
+ <div></div>
+ <div></div>
+ <div></div>
+ </div>
+ </div>
+</div>