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<html><head><style>#img1 { position: absolute; left: 0px; top: 0px; z-index: -1}</style></head><body><h1>This is a Heading</h1><img id="img1" src="bulbon.gif" width="100" height="180"><button type="button" onclick="myFunction()">Change stack order</button><p>Default z-index is 0. Z-index -1 has lower priority.</p><script>function myFunction() { document.getElementById("img1").style.zIndex = "1";}</script></body><!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_style_zindex by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:39:53 GMT --></html>