Try changing almost everything(i.e runat="server", single-double colons) Here is the try:
<head runat="server">
<script type="text/javascript" >
function Decide() {
document.getElementById('l').innerText = "after";
}
</script>
</head>
<body>
<form id="form1" runat="server">
<button onclick="Decide()">Click!</button>
<asp:Label ID="l" runat="server">before</asp:Label>
</form>
</body>
What am i doing wrong?
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