Category: HTML Reference

Distinguish q from blockquote and the cite element or attribute. Use a complete example to check source links and nested quotations while avoiding duplicate quotation marks.

Compare 15-minute and one-second time inputs in a complete example. Check submitted strings, required and interval validation, reset, midnight-crossing ranges, and the need for separate dates and time zones.

Build a slider that updates text size and its numeric output in real time. Compare current and initial values, inspect form submission, check keyboard controls, and restore every display on reset.

Validate quantities and decimal weights in a complete number-input example. Compare step bases, string and numeric values, empty-input handling, identifier fields, and server-side checks.

Inspect hidden values alongside checkboxes in a complete form example. Compare disabled and CSS-hidden fields, change values with JavaScript, and understand why the server must validate hidden inputs.

Run a complete video player example with WebM and MP4 sources. Choose playback attributes, compare responsive sizing, troubleshoot blocked autoplay or unsupported files, and plan captions and descriptions.

Run a complete textarea example with multiline defaults, required and length validation, readonly and disabled fields. Compare visual wrapping with line breaks and read current values safely in JavaScript.

Check normalized date values, inclusive ranges, required validation, reset, and seven-day steps in a complete example. Distinguish calendar dates from times and verify important rules on the server.

Run a complete HTML and PHP form example to compare GET and POST requests. Check field names, server validation, escaped output, encoding, reset behavior, and common submission failures.

Inspect multiple checkbox values, required validation, disabled-field exclusion, reset, and partial selection in a complete example. Learn how missing and repeated fields should be handled on the server.