Web Reference: 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. Dec 5, 2025 · It is important to ensure all required form controls are filled out, in the correct format, before submitting user entered form data to the server. This client-side form validation helps ensure data entered matches the requirements set forth in the various form controls. Jan 16, 2026 · The required attribute is a boolean attribute introduced in HTML5 to enforce mandatory input fields in forms. Its primary purpose is to trigger browser-level validation, preventing form submission until the user fills in the required field.
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