JSFiddle - React, Tailwind, and code Playground

HTML

<div class="modal" id="modal">
    <div>
        <div class="text">
            <h3>Обслуживание 1С</h3>
            
            <form action="sendPrajm.php" method="post"><input name="name" placeholder="Имя" size="38px" type="text" value="" /><br />
                <br />
                <input name="email" placeholder="E-mail" size="38px" type="text" value="" /><br />
                <br />
                <input name="phone" placeholder="Телефон" size="38px" type="text" value="" />
                <p>не забудьте указать в заявке название желаемого тарифного плана</p>
                <textarea cols="34.5" name="body" placeholder="Дополнительная информация" rows="10" style="resize: none"></textarea><br />
                <br />
                <button type="submit">Отправить</button><button type="reset">Отменить</button>
                
                <p></p>
            </form>
        </div>
        <a href="#close" title="Закрыть">Закрыть</a></div>
</div>
<table align="center" width="95%">
	<tbody>
		<tr>
			<td id="min"><a class="button openModal" data-set-text="текст 1">1</a></td>
			<td></td>
			<td id="opt"><a class="button openModal" data-set-text="текст 2">2</a></td>
			<td></td>
			<td id="loyal"><a class="button openModal" data-set-text="текст 3">3</a></td>
			<td></td>
			<td id="unlim"><a class="button openModal" data-set-text="текст 4">4</a></td>
		</tr>
		<tr>
		</tr>
	</tbody>
</table>

JavaScript

[].forEach.call(document.querySelectorAll(".button.openModal"), function($el)
                {
                    $el.onclick = function()
                    {
                        document.querySelector("textarea").innerHTML = $el.getAttribute("data-set-text");
                    };
                });