Lightning Components Developer Guide

What is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Creating Apps
Debugging
Fixing Performance Warnings
Reference
Reference Doc App
Supported aura:attribute Types
aura:application
aura:component
aura:dependency
aura:event
aura:interface
aura:method
aura:set
Component Reference
Messaging Component Reference
lightning:notificationsLibrary
lightning:overlayLibrary
Interface Reference
Event Reference
System Event Reference
Supported HTML Tags
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Messaging Component Reference

Messaging components include notifications and overlays that communicate relevant information to users. They are supported in Lightning Experience, Salesforce app, and Lightning communities.