This image contains a button and 4 instances of an HTML input element.

• In the first instance, the text inside the input box is plain.

• In the second instance, the text inside the input box is in italics.

• In the third instance, the text inside the input box is in bold and italics.

• In the fourth instance, the text inside the input box is in bold and italics and is colored pink.

The image also contains the following explanation text: The HTML input element uses :class attribute binding with an observable Array that gets updated with additional CSS classes. Click the button to add a new class to the class array on the HTML input element.