CSS ,working only in IE

Question

Why this CSS (and HTML) is working only in IE?

<style type="text/css">

div.scroll {
height: 50px;
width:300px;
overflow: auto;
border: 1px solid #666;
background-color: #ccc;
padding: 1px;
}

</style>
<div class="scroll">
<textarea rows="100"  cols="20" ></textarea>
</div>