Category: HTML

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 related controls with fieldset and legend, and use suitable autocomplete tokens to describe the purpose of input fields.

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

Choose input types based on the value being collected and understand how checkboxes and radio groups behave when submitted.

Create multi-line fields, selection lists, and form buttons while understanding initial values, submitted values, and reset behavior.

Understand how form action, method, and control names determine where form values go, and when GET or POST is appropriate.

Connect labels to inputs with for and id, distinguish id from submitted name, and learn why placeholder text cannot replace a label.

Make table headings and data relationships clear with caption, th, and scope, and learn when colspan or rowspan makes a table harder to read.

Build a basic HTML data table with rows and header or data cells, then organize its headings and body without using tables for page layout.

Use figure and figcaption to keep an image and its visible explanation together, and distinguish captions from image alt text.