JSFiddle - React, Tailwind, and code Playground

by int32_t

HTML

<p>Empty start page</p>

JavaScript

(function() {
  var html = "<!DOCTYPE html>\n<html>\n<head>\n  <title>Test page</title>\n</head>\n<body>\n\n<form action=\"/some/url\" method=\"post\">\n  <input type=\"submit\" value=\"Send\" />\n</form>\n<pre id=console></pre>\n</body></html>";

  document.addEventListener("DOMContentLoaded", function() {
    var parsed_document = (new DOMParser).parseFromString(html, 'text/html');
    document.documentElement.replaceChild(parsed_document.body, document.body);
    document.getElementById('console').textContent = document.forms[0].action;
  });
}).call(this);