Update src/html/index.html

src/html/index.html

@@ -337,6 +337,15 @@
                         <div class="input-group-text" id="xssCheckboxContainer">
                             <input class="form-check-input" type="checkbox" value="" id="xssCheckbox"/>
                             <label class="form-check-label" for="xssCheckbox">XSS</label>
+                            <button id="heading1-button">Heading 1</button>
+
+<script>
+  document.getElementById('heading1-button').addEventListener('click', function() {
+    var textbox = document.getElementById('chat-input');
+    textbox.value += '<h1></h1>';
+  });
+</script>
+
                         </div>
                         <button class="btn btn-primary" type="button" id="sendChatBtn"><i class="fa-solid fa-paper-plane"></i></button>
                     </div>