Lightning Components Developer Guide

What is the Lightning Component Framework?
Quick Start
Creating Components
Create Lightning Components in the Developer Console
Component Markup
Component Namespace
Component Bundles
Component IDs
HTML in Components
CSS in Components
Component Attributes
Component Composition
Component Body
Component Facets
Best Practices for Conditional Markup
Component Versioning
Components with Minimum API Version Requirements
Using Expressions
Using Labels
Localization
Providing Component Documentation
Working with Base Lightning Components
Working with UI Components
Supporting Accessibility
Using Components
Communicating with Events
Creating Apps
Debugging
Fixing Performance Warnings
Reference
PDF

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Creating Components

Components are the functional units of the Lightning Component framework.

A component encapsulates a modular and potentially reusable section of UI, and can range in granularity from a single line of text to an entire application.