In HTML5, which attribute is used to specify that an input field must be filled out?
HTML <input> required Attribute 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, tel, email, password, date pickers, number, checkbox, radio, search, URL, and file.
An example of an HTML form with a required input field is as follows:
<form action="https://www.slightbook.com/"> <label for="bookname">bookname:</label> <input type="text" id="bookname" name="bookname" required> <input type="submit"> </form>
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