As of my last knowledge update in September 2021, there isn't a specific "Input Events API" in HTML. However, HTML provides a wide range of input events that are part of the DOM (Document Object Model) Events API. These input events enable web developers to capture and respond to user interactions with input elements like forms, buttons, checkboxes, text fields, and more. Here's an overview of common input events in HTML:

Key Input Events:

1. click: This event is fired when a pointing device (such as a mouse) button is clicked on an element.

2. change: This event is typically associated with form elements like <input>, <select>, and <textarea>. It is triggered when the value of the element is changed by the user.

3. input: The input event is fired when the value of an <input>, <textarea>, or <select> element is changed by the user. It also fires when the user pastes content into an input element.

4. focus: The focus event is fired when an element receives focus, typically via a click or keyboard navigation.

5. blur: The blur event is triggered when an element loses focus, typically because the user clicks away or presses the Tab key.

6. **keydown, keyup: These events are fired when a key on the keyboard is pressed down and released, respectively.

7. **keypress: The keypress event is fired when a key that produces a character value is pressed.

8. **submit: This event is fired when a form is submitted, typically when the user clicks a submit button.

9. **reset: The reset event is fired when a form is reset, typically when the user clicks a reset button.

10. **select: The select event is related to <input type="text"> and <textarea> elements. It is triggered when the user selects some or all of the text within the input element.

Usage:

You can attach event listeners to input elements in your HTML or use JavaScript to dynamically add event listeners. For example, you can use JavaScript to add a click event listener to a button element like this:

const button = document.getElementById('myButton');

button.addEventListener('click', function(event) {
  // Your code to handle the click event goes here
});

For form elements, you can capture submit and change events:

const form = document.getElementById('myForm');

form.addEventListener('submit', function(event) {
  event.preventDefault(); // Prevent the form from actually submitting
  // Your code to handle the form submission goes here
});

const input = document.getElementById('myInput');

input.addEventListener('change', function(event) {
  // Your code to handle changes in the input value goes here
});

Use Cases:

• Validating form input: Use input events like change to validate user input in real time.

• Enhancing user experience: Employing events like click to create interactive elements.

• Handling keyboard input: Use keydown and keyup to capture user keyboard input and perform actions based on key presses.

• Form submission: Use submit and reset events to handle form submission and reset actions.

Keep in mind that events may vary in how they're supported across different HTML elements and browsers. Browser compatibility and event behavior may change, so it's essential to refer to the latest documentation and perform testing for specific use cases.