HTML - Formularioque llegue a TXT (sin PHP)

Nombre: <input id="txtNombre" type="text" />

<button type="button" id="cmdGuardar">Guardar</button>

<a href="" id="downloader" style="display:none"></a>

<script>

	document.getElementById('cmdGuardar').addEventListener('click',download);

	function download() {

		var name = 'MiFormulario.txt';

		var type = 'text/plain';

		var text = "{'txtNombre':'"+document.getElementById('txtNombre').value+"'}";

		var file = new Blob([text], {type: type});

		var downloader = document.getElementById("downloader");

		downloader.href = URL.createObjectURL(file);

		downloader.download = name;

		downloader.click();

	}

</script>