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 (Developer Preview)
Creating Apps
Styling Apps
Developing Secure Code
Using JavaScript
Working with Salesforce Data
Testing Components with Lightning Testing Service
Debugging
Performance
Reference
Component Library
System Tag Reference
aura:application
aura:dependency
aura:event
aura:interface
aura:method
aura:set
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System Tag Reference

System tags represent framework definitions and are not available in the Component Library.