Input in Custom HTML Prompt: How to select the default input string by default?

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As soon as I posted it, I've found the solution myself. It is to put the element.select() function in KMDidShowWindow():

    <html>
    <head>
	<script>
    function KMDidShowWindow(){
        document.getElementById("myid").select();
    }
	</script>
    </head>
    <body>
            <div><input type="text" id="myid" name="LocalName" autofocus/></div>
    </body>
    </html>
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