Как-то так:
<html>
<head>
<meta charset="utf-8">
<title>…</title>
<style>
.details > input:checked + .text {
display: none;
}
.details input {
visibility: hidden;
}
.details label {
cursor: pointer;
color: #00f;
text-decoration: underline;
}
</style>
</head>
<body>
<div class="details">
<label for="trigger">Скрыть/показать</label>
<input id="trigger" type="checkbox">
<div class="text">Lorem Ipsum is simply dummy text of the printing and typesetting industry.</div>
</div>
</body>
</html>