Lightning Aura Components Developer Guide

What Is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Communicating Across the DOM with Lightning Message Service
Creating Apps
Styling Apps
Using the Salesforce Lightning Design System in Apps
Using External CSS
More Readable Styling Markup with the join Expression
Tips for CSS in Components
CSS for RTL Languages
Vendor Prefixes
Styling with Design Tokens
Tokens Bundles
Create a Tokens Bundle
Defining and Using Tokens
Using Expressions in Tokens
Extending Tokens Bundles
Using Standard Design Tokens
Developing Secure Code
Using JavaScript
Working with Salesforce Data
Testing Components with Lightning Testing Service
Debugging
Performance
Reference
PDF

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Styling with Design Tokens

Capture the essential values of your visual design into named tokens. Define the token values once and reuse them throughout your Lightning components CSS resources. Tokens make it easy to ensure that your design is consistent, and even easier to update it as your design evolves.

Design tokens are visual design “atoms” for building a design for your components or apps. Specifically, they’re named entities that store visual design attributes, such as pixel values for margins and spacing, font sizes and families, or hex values for colors. Tokens are a terrific way to centralize the low-level values, which you then use to compose the styles that make up the design of your component or app.