◆ AI Learning · Hard rule

How should a developer build web pages to work on both mobile phones and desktop computers?

A developer must design web pages for small mobile screens first. Then, the developer can add features for larger desktop screens. This ensures the page works well on all devices.

By Pawan Nayar · from the LLOS AI Learning record

The rule

A developer must design web pages for small mobile screens first.

Then, the developer can add features for larger desktop screens. This ensures the page works well on all devices.

A developer should always start designing for mobile phones. The page must fit a 320-pixel screen width without horizontal scrolling. A developer should not put large blocks of data directly into the main page code. These data blocks belong in separate data files. All numbers shown to the user must be formatted correctly. Use a special tool for this. For number inputs, use a tool that allows both a slider and typing. On mobile, results should stay visible as the user scrolls. Every calculator page needs a glossary, a quiz, and frequently asked questions.

A developer creates a new online calculator. The developer first designs the layout for a phone screen. The developer makes sure no content goes off the side of the screen. Later, the developer adds more features that are only visible on a larger desktop monitor. This way, all users can easily use the calculator.

Words you'll need

Resolved from this lesson's own record — real definitions, not invented for this page.

Human-Computer Interaction

How people and computers communicate and work together

Design Patterns

Reusable solutions to common problems in design

Questions people ask

More from the same record, pulled by shared topic — not written new for this page.

How should a developer ensure a new page matches the brand, has good spacing, and uses correct text-to-speech?

A developer must use the brand's exact color palette. A developer must use the specified fonts.

What are the rules for designing and building web pages for a large system?

A design system is a set of rules for creating web pages. These rules tell a developer how to use fonts and text sizes.

What are the key design rules for building a mobile application?

Text must have enough contrast to be easily read on any background. Interactive elements like buttons need to be large enough for a finger to tap.

What are the rules for building an AI learning experience?

A developer must follow specific rules for layout. The entire screen should be visible without scrolling.