Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<head>
<style>
img {
    position: absolute;
    left: 0px;
    top: 0px;
    z-index: -1;
}
</style>
</head>
<body>

<h1>This is a heading</h1>

<img src="w3css.gif" width="100" height="140">

<p>Because the image has a z-index of -1, it will be placed behind the text.</p>

</body>
</html>