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Here is a modification I made to one of the previous examples so as to include a favicon:

data:text/html,<link rel="shortcut icon" href="https://raw.githubusercontent.com/Microsoft/Windows-classic-samples/master/Samples/Win7Samples/winui/shell/appplatform/aerowizards/migratingtoaerowizardssdksample/wizard97/notepad.ico" type="image/x-icon"><title>Text Editor</title><button onClick="SaveTextArea()">Save</button> <script language="javascript" type="text/javascript"> function SaveTextArea() { window.location = "data:application/octet-stream," + escape(txtBody.value); } </script> <textarea id="txtBody" style="font-size: 2em; width: 100%; height: 100%; boarder: none; outline: none" autofocus> </textarea>

Enjoy.