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.app {
display: flex;
flex-direction: column;
gap: 16px;
}

.start-messages {
width: fit-content;
}

.window {
width: 100%;
border: 2px solid #464154;
overflow: hidden;
}

.window__header {
position: sticky;
padding: 8px;
display: flex;
justify-content: space-between;
align-items: center;
background-color: #736e7e;
}

.window__title {
margin: 0;
font-size: 24px;
font-weight: 700;
color: white;
letter-spacing: 1px;
}

.window__button {
padding: 4px;
background: #4f495c;
outline: none;
border: 2px solid #464154;
color: white;
font-size: 16px;
cursor: pointer;
}

.window__body {
height: 250px;
padding: 16px;
overflow: scroll;
background-color: #736e7e33;
}
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<!DOCTYPE HTML>
<html>

<head>
<meta charset="utf-8">
<link rel="stylesheet" href="index.css">
</head>

<body>

<div class="app">
<button class="start-messages">Начать отправку сообщений</button>
<div class="window">
<div class="window__header">
<p class="window__title">Сообщения:</p>
<button class="window__button">Закрыть</button>
</div>
<div class="window__body">
Нет сообщений.
</div>
</div>
</div>


<script type="module" src="index.js"></script>
</body>
</html>
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const startMessagesBtn = document.querySelector('.start-messages'); // (1)
const closeWindowBtn = document.querySelector('.window__button'); // (2)
const windowElementRef = new WeakRef(document.querySelector(".window__body")); // (3)

startMessagesBtn.addEventListener('click', () => { // (4)
startMessages(windowElementRef);
startMessagesBtn.disabled = true;
});

closeWindowBtn.addEventListener('click', () => document.querySelector(".window__body").remove()); // (5)

const startMessages = (element) => {
const timerId = setInterval(() => { // (6)
if (element.deref()) { // (7)
const payload = document.createElement("p");
payload.textContent = `Сообщение: Статус системы OK: ${new Date().toLocaleTimeString()}`;
element.deref().append(payload);
} else { // (8)
alert("Элемент был удалён."); // (9)
clearInterval(timerId);
}
}, 1000);
};
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