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+++ b/test/data/html/test-document3-frame2.html
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+<!DOCTYPE html>
+<html>
+    <head>
+        <meta charset="UTF-8">
+        <meta name="viewport" content="width=device-width,initial-scale=1" />
+        <title>Yomichan Manual Performance Tests</title>
+        <link rel="stylesheet" href="test-stylesheet.css" />
+    </head>
+<body><div class="content">
+
+    <div class="description">&lt;iframe&gt; element inside of an open shadow DOM.</div>
+
+    <div id="shadow-iframe-container-open"></div>
+    <template id="shadow-iframe-container-open-content-template">
+        <iframe src="test-document2-frame1.html" allowfullscreen="true" style="width: 100%; height: 50px; border: 1px solid #d8d8d8;"></iframe>
+    </template>
+    <script>
+(() => {
+    const shadowIframeContainer = document.querySelector('#shadow-iframe-container-open');
+    const shadow = shadowIframeContainer.attachShadow({mode: 'open'});
+    const template = document.querySelector('#shadow-iframe-container-open-content-template').content;
+    const content = document.importNode(template, true);
+    shadow.appendChild(content);
+})();
+    </script>
+
+    <div class="description">Add elements</div>
+
+    <div>
+        <a href="#" id="add-elements-1000">1000</a>
+        <a href="#" id="add-elements-10000">10000</a>
+        <a href="#" id="add-elements-100000">100000</a>
+        <a href="#" id="add-elements-1000000">1000000</a>
+    </div>
+
+    <div id="counter"></div>
+    <div id="container"></div>
+    <script>
+(() => {
+    document.querySelector('#add-elements-1000').addEventListener('click',    () => addElements(1000), false);
+    document.querySelector('#add-elements-10000').addEventListener('click',   () => addElements(10000), false);
+    document.querySelector('#add-elements-100000').addEventListener('click',  () => addElements(100000), false);
+    document.querySelector('#add-elements-1000000').addEventListener('click', () => addElements(1000000), false);
+
+    let counter = 0;
+
+    function addElements(amount) {
+        const container = document.querySelector('#container');
+        for (let i = 0; i < amount; i++) {
+            const element = document.createElement('div');
+            element.textContent = 'ありがとう';
+            container.appendChild(element);
+        }
+
+        counter += amount;
+        document.querySelector('#counter').textContent = counter;
+    }
+})();
+    </script>
+
+</div></body>
+</html>