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-rw-r--r--dom/base/crashtests/1757923.html22
1 files changed, 22 insertions, 0 deletions
diff --git a/dom/base/crashtests/1757923.html b/dom/base/crashtests/1757923.html
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--- /dev/null
+++ b/dom/base/crashtests/1757923.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+ <head>
+ <script>
+ class CustomElement extends HTMLElement {
+ constructor () {
+ super();
+ }
+ }
+
+ let element = document.createElement("custom-element");
+ customElements.define("custom-element", CustomElement);
+ customElements.upgrade(element);
+
+ const internals = element.attachInternals();
+ element = undefined;
+ SpecialPowers.forceGC();
+ SpecialPowers.forceCC();
+ internals.shadowRoot;
+ </script>
+ </head>
+</html>