Which attributes could you use with the input type='email' to ensure that users do not inadvertently enter an extra space, an invalid format or an irrelevant answer?

Which attributes could you use with the input type='email' to ensure that users do not inadvertently enter an extra space, an invalid format or an irrelevant answer?

• A. pattern, placeholder, required
• B. maxlength, min, autofocus
• C. title, multiple, form
• D. autocomplete, spellcheck, dir

Answer: (A)

The main idea is to use input attributes that guide users and enforce sensible content for an email field. The pattern attribute lets you supply a regular expression that the entered value must match, so you can tighten the format beyond the browser’s default validation and reduce obviously invalid addresses. The placeholder attribute provides a visible hint inside the field, showing an example like user@example.com to help users produce the right format and avoid stray spaces or unrelated input. The required attribute ensures the field isn’t left empty, preventing an irrelevant or missing answer. Together, these options address completeness (required), correctness of format (pattern), and user guidance (placeholder).

Other options don’t target these needs as directly. For example, maxlength limits length, min isn’t meaningful for emails, and autofocus simply focuses the field. Title, multiple, or form don’t specifically prevent invalid formats or unrelated answers. Autocomplete, spellcheck, and dir relate to assistance and layout rather than enforcing proper email input.