If a pull-down menu's select element has a required attribute, it means that when the pull-down menu's form is submitted: A) the pull-down menu expands to show all the menu's options. B) the browser highlights the pull-down menu, usually with a red border. C) the pull-down menu control is considered to be invalid if the user's selected value is the empty string.

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Quizplus · Accepted Answer

The `required` attribute ensures that the user selects a non-empty option before form submission, making the control invalid if the selected value is empty.

If a Pull-Down Menu's ≪code>select</code> Element Has a ≪code>required</code> Attribute