how to know what option i have selected in a drop down list html code example

Example: Show html when a list in the dropdown is selected

<!DOCTYPE html>
<html>
   <body>
      <form id="myForm">
         <select id="selectNow">
            <option>One</option>
            <option>Two</option>
            <option>Three</option>
         </select>
         <input type="button" onclick="display()" value="Click">
      </form>
      <p>Select and click the button</p>
      <script>
         function display() {
            var obj = document.getElementById("selectNow");
            document.write(obj.options[obj.selectedIndex].text);
         }
      </script>
   </body>
</html>

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