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diff --git a/layout/style/crashtests/1502893.html b/layout/style/crashtests/1502893.html
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+++ b/layout/style/crashtests/1502893.html
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+<!DOCTYPE html>
+<style>
+ #animate_0[onrepeat=''] {}
+</style>
+<animate id="animate_0" />
+<animate id="animate_1" />
+<script>
+ window.CustomElement0 = class extends HTMLElement {
+ constructor() {
+ super();
+ this.attachShadow({
+ mode: 'open'
+ })
+ }
+ connectedCallback() {
+ this.shadowRoot.prepend(o2)
+ this.setAttribute('contenteditable', 'true')
+ }
+ }
+
+ customElements.define('custom-element-0', CustomElement0)
+ o1 = document.createElement('custom-element-0')
+ o2 = document.getElementById('animate_0')
+ o3 = document.getElementById('animate_1')
+ document.documentElement.appendChild(o1)
+ document.replaceChild(document.documentElement, document.documentElement)
+ o1.shadowRoot.prepend(o3)
+ o3.offsetTop;
+</script>