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diff --git a/layout/generic/crashtests/1381134-2.html b/layout/generic/crashtests/1381134-2.html
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+++ b/layout/generic/crashtests/1381134-2.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="UTF-8">
+<script>
+addEventListener("DOMContentLoaded", () => {
+ [d1, d2] = document.getElementsByTagName("div");
+ [s1, s2] = document.getElementsByTagName("span")
+ d3 = document.createElement("div")
+ d4 = document.createElement("div")
+ d4.setAttribute("class", "grid")
+ d3.appendChild(d4)
+ d1.appendChild(document.createElement("span"))
+ setTimeout(() => {
+ d2.removeChild(s2)
+ setTimeout(() => {
+ d2.insertBefore(d3, s1)
+ }, 100)
+ }, 100)
+})
+</script>
+<style>
+.columns {
+ columns: 3;
+}
+.grid {
+ border:5px solid;
+ counter-reset: item;
+}
+.grid * { display:block; }
+span { display:contents; }
+span::before { content: counter(item) ":before"; }
+span::after { content: counter(item) ":after"; }
+</style>
+</head>
+<body>
+<div class=columns>
+<div class=grid>
+<c></c>
+<span><c></c></span>
+<span><c></c></span>
+</div>
+</div>
+</body>
+</html>