Explain why DOCTYPE html is a required HTML tag, but not an active one

Definition and Usage. The required attribute is a boolean attribute. When present, it specifies that an input field must be filled out before submitting the form. Note: The required attribute works with the following input types: text, search, url, tel, email, password, date pickers, number, checkbox, radio, and file.

:active is a CSS pseudo-class. It specifies and selects an element based on a state—the active state—and is used to apply styles to an element when it matches that state. The :active pseudo-class is a dynamic class which applies when an element is being activated by the user.

The required attribute of the <select> element is to let users know that the <select> drop-down is required and need to be submitted before the form is submitted. If you won't select the value from the drop-down and try to submit the form, it won't submit and a warning would be visible on the web page itself.

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Explanation:

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