diff --git a/README.md b/README.md
index 9d22b4d..c6bbab5 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 [![devDependency Status](https://david-dm.org/prantlf/jsonlint/dev-status.svg)](https://david-dm.org/prantlf/jsonlint#info=devDependencies)
 [![JavaScript Style Guide](https://img.shields.io/badge/code_style-standard-brightgreen.svg)](https://standardjs.com)
 
-A pure [JavaScript version](http://prantlf.github.com/jsonlint/) of the service provided at [jsonlint.com](http://jsonlint.com).
+A JSON parser and validator with a command-line client. A [pure JavaScript version](http://prantlf.github.com/jsonlint/) of the service provided at [jsonlint.com](http://jsonlint.com).
 
 This is a fork of the original package with the following extensions:
 
diff --git a/web/jsonlint.html b/web/jsonlint.html
index f562d21..458bf84 100644
--- a/web/jsonlint.html
+++ b/web/jsonlint.html
@@ -1,67 +1,98 @@
-<!doctype html> 
-<html lang="en"> 
-<head> 
-    <meta charset="utf-8" /> 
-    <title>JSON Lint</title> 
-    <script src="json2.js"></script>
-    <script src="jsonlint.js"></script>
-    <script>
-      window.onload = function () {
-        document.getElementById("button").onclick = function () {
-          try {
-            var parser = jsonlint
-            if (document.getElementById("comments").checked) {
-              parser = new jsonlint.parser.ParserWithComments
-            }
-            var result = parser.parse(document.getElementById("source").value);
-            if (result) {
-              document.getElementById("result").innerHTML = "JSON is valid!";
-              document.getElementById("result").className = "pass";
-              if (document.getElementById("reformat").checked) {
-                document.getElementById("source").value = JSON.stringify(result, null, "  ");
-              }
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <meta name="description" content="JSON validator - checks syntax of a JSON source.">
+  <title>JSON Lint</title>
+  <style>
+    body {
+      font-family: sans-serif;
+      margin: 1ex;
+    }
+    #source, #result {
+      padding: 1ex;
+    }
+    #source, #validate {
+      font-size: 100%;
+    }
+    #source {
+      font-family: monospace;
+      width: calc(100% - 2ex);
+    }
+    #result-section {
+      display: none;
+    }
+    .pass {
+      background-color: #efe;
+      color: #393;
+      border: 2px solid #393;
+    }
+    .fail {
+      background-color: #fee;
+      color: #933;
+      border: 2px solid #933;
+    }
+  </style>
+</head>
+
+<body>
+  <header>
+    <h1>JSON Lint</h1>
+    <p>Enter a JSON source and check its syntax in the form below. A pure JavaScript version of the service provided at <a href="http://jsonlint.com/">jsonlint.com</a>.</p>
+  </header>
+  <main>
+    <section>
+      <form>
+        <h2>Source</h2>
+        <textarea id="source" rows="10" cols="50" aria-label="Source"></textarea>
+        <p>
+          <input type="checkbox" checked id="reformat">
+          <label for="reformat">Reformat source</label>
+          <span>&nbsp;&nbsp;&nbsp;</span>
+          <input type="checkbox" id="comments">
+          <label for="comments">Ignore JavaScript-style comments</label>
+        </p>
+        <p>
+          <button id="validate" type="button">Validate</button>
+        </p>
+      </form>
+    </section>
+    <section id="result-section">
+      <h2>Result</h2>
+      <pre id="result"></pre>
+    </section>
+  </main>
+  <hr>
+  <footer>
+    <small>Copyright &copy; 2012-2019 Zachary Carter, Ferdinand Prantl. Licensed under the MIT license. View the <a href="https://github.com/prantlf/jsonlint#json-lint">project on GitHub</a>.</small>
+    <!-- See http://tholman.com/github-corners/ -->
+    <a href="http://github.com/prantlf/jsonlint" class="github-corner" title="View source on GitHub"><svg width="80" height="80" viewBox="0 0 250 250" style="fill:#151513; color:#fff; position: absolute; top: 0; border: 0; right: 0;" aria-hidden="true"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path></svg></a><style>.github-corner:hover .octo-arm{animation:octocat-wave 560ms ease-in-out}@keyframes octocat-wave{0%,100%{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:octocat-wave 560ms ease-in-out}}</style>
+  </footer>
+  <script src="jsonlint.js" defer></script>
+  <script defer>
+    window.onload = function () {
+      document.getElementById('validate').onclick = function () {
+        document.getElementById('result-section').style.display = 'block'
+        try {
+          var parser = jsonlint.parser
+          if (document.getElementById('comments').checked) {
+            parser = new parser.ParserWithComments()
+          }
+          var result = parser.parse(document.getElementById('source').value)
+          if (result) {
+            document.getElementById('result').innerText = 'JSON is valid!'
+            document.getElementById('result').className = 'pass'
+            if (document.getElementById('reformat').checked) {
+              document.getElementById('source').value = JSON.stringify(result, null, '  ')
             }
-          } catch(e) {
-            document.getElementById("result").innerHTML = e;
-            document.getElementById("result").className = "fail";
           }
-        };
-      }
-    </script>
-    <style>
-      body {font-family: sans-serif;}
-      #result {
-        padding: 1em;
-      }
-      .pass {
-        background-color: #efe;
-        color: #393;
-        border: 2px solid #393;
-      }
-      .fail {
-        background-color: #fee;
-        color: #933;
-        border: 2px solid #933;
+        } catch (error) {
+          document.getElementById('result').innerText = error
+          document.getElementById('result').className = 'fail'
+        }
       }
-      textarea { width: 100%; }
-    </style>
-</head> 
-<body> 
-  <h1>JSON Lint</h1> 
-  <p>A pure JavaScript version of the service provided at <a href="http://jsonlint.com/">jsonlint.com</a>.</p>
-  <textarea id="source" rows="20" cols="50"></textarea>
-  <p>
-    <input type="checkbox" checked id="reformat">
-    <label for="reformat">reformat JSON</label>
-    <br>
-    <input type="checkbox" id="comments">
-    <label for="comments">ignore JavaScript-style comments</label>
-  </p>
-  <p>
-    <button id="button">Validate</button>
-  </p>
-  <h2>Results</h2>
-  <pre id="result"></pre>
-  <p><a href="http://github.com/prantlf/jsonlint">project on github</a></p> 
-</body> 
-</html> 
+    }
+  </script>
+</body>
+</html>
