Web development foundations

How structure, style and interaction work together.

A web page combines structure, presentation and behavior. Understanding these layers makes it easier to build and maintain useful interfaces.

Structure with HTML

Use meaningful headings, links, buttons and labels. Good structure helps people and assistive technology understand the page.

Create a flexible layout, readable typography and visible focus states. Check the layout on narrow screens.

Add behavior only where it helps the user. Keep feedback clear and handle empty results and invalid input.