Form Is Missing <submit> Button

How to Fix The Problem

Add a button to submit the form, preferably one of the following element types: <input type="submit">, <input type="image">, or <button type="submit">.

The Algorithm, In Simple Terms

The engine scans <form> elements for child elements of the following types: <input type="submit">, <input type="image">, or <button type="submit">.

Why Is It Important?

When the form gets submitted in an unpredictable manner, it confuses the user.

Code Example

<form>
    <label for="field1">Field 1</label>
    <select name="field1" id="field1"> 
        <option value="1">Option 1</option>
        <option value="2">Option 2</option>
        <option value="3">Option 3</option>
        <option value="4">Option 4</option>
    </select>
    <input type="submit">
</form>