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-rw-r--r--testing/web-platform/tests/editing/crashtests/designMode-on-of-lazy-loading-iframe.html20
1 files changed, 20 insertions, 0 deletions
diff --git a/testing/web-platform/tests/editing/crashtests/designMode-on-of-lazy-loading-iframe.html b/testing/web-platform/tests/editing/crashtests/designMode-on-of-lazy-loading-iframe.html
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index 0000000000..90a6c85c45
--- /dev/null
+++ b/testing/web-platform/tests/editing/crashtests/designMode-on-of-lazy-loading-iframe.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<style>
+*::first-letter {}
+</style>
+<script>
+addEventListener("load", () => {
+ const iframe = document.querySelector("iframe");
+ iframe.contentWindow.focus();
+ document.styleSheets[0].deleteRule(0);
+ iframe.contentWindow.document.designMode = "on";
+});
+</script>
+</head>
+<body>
+<iframe loading="lazy">
+</body>
+</html>