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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>log parse</title>
  </head>
  <body>
    <textarea id="input"></textarea>
    <button id="download" type="button">download</button>
    <script>
        document.getElementById("download").addEventListener("click", function() {
            var inputtext = document.getElementById("input").value      
            var filename = "download_sample.txt"
            
            saveFile(inputtext, filename)

        }, false)


        function saveFile(contents, filename) {
            var filename_ = filename || "file.txt"

            var blob = new Blob([ contents ], { "type": "text/plain" })

            var msSaveBlob = window.navigator.msSaveBlob
            if (msSaveBlob) {
                msSaveBlob(blob, filename)
            } else {
                var a = document.createElement("a")
                a.href = URL.createObjectURL(blob)
                a.target = "_blank"
                a.download = filename
                a.click()
                URL.revokeObjectURL(a.href)
            }
        }

    </script>
  </body>
</html>
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