JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css">
<div>
  <button id="btn-1" class="btn btn-primary m-4">Save Locally</button>
  <button id="btn-2" class="btn btn-danger m-4">Open in JSFiddle</button>
</div>

JavaScript

var $button1 = $("#btn-1");
var $button2 = $("#btn-2");

// Save Locally
$button1.on('click', function() {
  if (typeof(Blob) !== "undefined" && !!new Blob()) {
    var codeToSave = '<!doctype html>' +
      '<html lang="en">' +
      '<head>' +
      '</head>' +
      '<body>' +
      '<h1>Hello, world!</h1>' +
      '</body>' +
      '</html>';

    var codeBlob = new Blob([codeToSave], {
      type: "text/html"
    });
    var codeSaveAsURL = window.URL.createObjectURL(codeBlob);
    var fileNameToSaveAs = "temp-file.html";

    if (window.navigator && window.navigator.msSaveOrOpenBlob) { // For IE, Edge
      window.navigator.msSaveOrOpenBlob(codeBlob, fileNameToSaveAs);
    } else {
      var downloadLink = document.createElement("a");
      downloadLink.download = fileNameToSaveAs;
      downloadLink.href = codeSaveAsURL;
      downloadLink.style.display = "none";
      document.body.appendChild(downloadLink);
      downloadLink.click();
      document.body.removeChild(downloadLink);
    }

    window.URL.revokeObjectURL(codeBlob);
    codeSaveAsURL = null;
    codeBlob = null;
  }

  return false;
});

// Open in JSFiddle
$button2.on('click', function() {
  var form = document.createElement("form");
  form.id = "submitToFiddle";
  form.style.display = "none";
  form.method = "post";
  form.action = "https://jsfiddle.net/api/post/library/pure/";
  form.target = "check";
  //		form.target = "_blank";

  var input = document.createElement("textarea");
  input.name = "html";
  input.innerHTML = '<h1>Fiddle!</h1>';
  document.body.appendChild(form);
  form.appendChild(input);;

  input = document.createElement("input");
  input.type = "submit";
  form.appendChild(input);
  form.submit();
  document.body.removeChild(form);
  return false;
});