Unable to link html with JS file

That’s my html file

<!DOCTYPE html>
<html>
    <head>
        <script src="ll.js"></script>

    </head>
    <body>
        <link rel="stylesheet" href="home.css">
        
        <h1><span>Styled</span> and <span>filterable</span> select dropdown</h1>

        <form>
            <input class="chosen-value" type="text" value="" placeholder="Type to filter">
            <ul class="value-list">
              <li>Alabama</li>
              <li>Alaska</li>
              <li>Arizona</li>
              <li>Arkansas</li>
              <li>California</li>
              <li>Colorado</li>
              <li>Connecticut</li>
              <li>Delaware</li>
              <li>Florida</li>
              <li>Georgia</li>
              <li>Hawaii</li>
              <li>Idaho</li>
              <li>Illinois</li>
              <li>Indiana</li>
              <li>Iowa</li>
              <li>Kansas</li>
              <li>Kentucky</li>
              <li>Louisiana</li>
              <li>Maine</li>
              <li>Maryland</li>
              <li>Massachusetts</li>
              <li>Michigan</li>
              <li>Minnesota</li>
              <li>Mississippi</li>
              <li>Missouri</li>
              <li>Montana</li>
              <li>Nebraska</li>
              <li>Nevada</li>
              <li>New Hampshire</li>
              <li>New Jersey</li>
              <li>New Mexico</li>
              <li>New York</li>
              <li>North Carolina</li>
              <li>North Dakota</li>
            </ul>
          </form>


</body>
</html>

My CSS is linked properly.
JavaScript file (ll.js):

const inputField = document.querySelector('.chosen-value');
const dropdown = document.querySelector('.value-list');
const dropdownArray = [... document.querySelectorAll('li')];
console.log(typeof dropdownArray)
dropdown.classList.add('open');
inputField.focus(); // Demo purposes only
let valueArray = [];
dropdownArray.forEach(item => {
  valueArray.push(item.textContent);
});

const closeDropdown = () => {
  dropdown.classList.remove('open');
}

inputField.addEventListener('input', () => {
  dropdown.classList.add('open');
  let inputValue = inputField.value.toLowerCase();
  let valueSubstring;
  if (inputValue.length > 0) {
    for (let j = 0; j < valueArray.length; j++) {
      if (!(inputValue.substring(0, inputValue.length) === valueArray[j].substring(0, inputValue.length).toLowerCase())) {
        dropdownArray[j].classList.add('closed');
      } else {
        dropdownArray[j].classList.remove('closed');
      }
    }
  } else {
    for (let i = 0; i < dropdownArray.length; i++) {
      dropdownArray[i].classList.remove('closed');
    }
  }
});

dropdownArray.forEach(item => {
  item.addEventListener('click', (evt) => {
    inputField.value = item.textContent;
    dropdownArray.forEach(dropdown => {
      dropdown.classList.add('closed');
    });
  });
})

inputField.addEventListener('focus', () => {
   inputField.placeholder = 'Type to filter';
   dropdown.classList.add('open');
   dropdownArray.forEach(dropdown => {
     dropdown.classList.remove('closed');
   });
});

inputField.addEventListener('blur', () => {
   inputField.placeholder = 'Select state';
  dropdown.classList.remove('open');
});

document.addEventListener('click', (evt) => {
  const isDropdown = dropdown.contains(evt.target);
  const isInput = inputField.contains(evt.target);
  if (!isDropdown && !isInput) {
    dropdown.classList.remove('open');
  }
});

How can I link they properly? I have tried adding

        <script src="ll.js"></script>

at multiple other places like in form tag, in body tag but it doesn’t work. I tested JS, HTML and CSS on JsBin it works perfectly just the problem is in linking these files together.