<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width,initial-scale=1">
        <title>Yomitan Manual Performance Tests</title>
        <link rel="stylesheet" href="test-stylesheet.css">
    </head>
<body><div class="content">

    <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>
        <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>

    <div id="counter"></div>
    <div id="container"></div>

</div></body>
</html>