Category: HTML

Review the meaning and keyboard use of headings, links, images, and forms. Practice manual testing on a small page with a skip link, persistent field instructions, and visible focus.

Build Home, About, and Contact pages with shared navigation and distinct metadata. Separate contact-input practice from a receiving service and check navigation, validation, and keyboard completion criteria.

Find markup issues with the Nu HTML Checker and distinguish validation from browser behavior. Compare a complete duplicate-ID example with its correction and test each label association.

Create keyboard-operable expandable content with details and summary, and decide when to start it open or show content directly.

Use audio, video, iframe, captions, and alternative links appropriately. Responsive CSS and a local iframe exercise help you check paths, aspect ratios, and narrow-screen layout.

Place html lang and the head's title and meta settings correctly. Compare their purposes and checks, then troubleshoot UTF-8 file encoding and server response headers.

Learn how to add placeholder hints to HTML input and textarea fields without confusing them with labels or initial values. Includes a complete form example, required-field checks, and an explanation of empty values in submitted data.

Group questions with fieldset, legend, and distinct radio names, and describe input purposes with autocomplete. Test two independent groups and compare common autofill tokens.

Apply built-in required, length, and numeric constraints, test error states, and understand why server-side validation remains necessary.

Choose email, number, date, checkbox, and radio inputs by their purpose. A complete form lets you compare date values, required groups, and the entries omitted by unselected controls.