tesseract_demo.html

<script src='https://unpkg.com/tesseract.js@v2.0.0-alpha.3/dist/tesseract.min.js'></script>
<input type="file" onchange="getRego(this.files)">

<script>
function getRego(files) {
    const worker = new Tesseract.TesseractWorker();
    worker.recognize(files[0]).then(function(data){
        // construct something which glues all the words together...
        console.log(data.text);
        })
}
</script>