input:     def submit_form():
          """
          This function creates an HTML form and uses JavaScript to send the user's city input to the server.
          
          Example:
          - Entering 'San Francisco' as the city and submitting the form will send the data to the server.
          """
          return """
          <form id="myForm" onsubmit="submitForm(event)">
            City:<br>
            <input type="text" name="city"><br>
            <input type="submit">
          </form>
  
          <script>
          function submitForm(event) {
            event.preventDefault();
  
            const form = document.getElementById('myForm');
            const city = form.querySelector('input[name="city"]').value;
  
            const data = { city: city };
  
            const options = {
              method: 'POST',
              body: JSON.stringify(data),
              headers: {
                'Content-Type': 'application/json'
              }
            };
  
            fetch('/my-api/submit-form', options)
              .then(response => response.json())
              .then(data => {
                console.log(data);
              });
          }
          </script>
          """
output:     return """
          <form id="myForm" onsubmit="submitForm(event)">
            City:<br>
            <input type="text" name="city"><br>
            <input type="submit">
          </form>
  
          <script>
          function submitForm(event) {
            event.preventDefault();
  
            const form = document.getElementById('myForm');
            const city = form.querySelector('input[name="city"]').value;
  
            const data = { city: city };
  
            const options = {
              method: 'POST',
              body: JSON.stringify(data),
              headers: {
                'Content-Type': 'application/json'
              }
            };
  
            fetch('/my-api/submit-form', options)
              .then(response => response.json())
              .then(data => {
                console.log(data);
              });
          }
          </script>
          """