<!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>