Lightning Aura Components Developer Guide

What Is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Creating Apps
Styling Apps
Developing Secure Code
What is Lightning Locker?
JavaScript Strict Mode Enforcement
DOM Access Containment
Secure Wrappers
eval() Function is Limited by Lightning Locker
MIME Types Permitted
Access to Supported JavaScript API Framework Methods Only
What Does Lightning Locker Affect?
Lightning Locker Tools
Disabling Lightning Locker for a Component
Don’t Mix Component API Versions
Lightning Locker Disabled for Unsupported Browsers
Content Security Policy Overview
Freeze JavaScript Prototypes
Using JavaScript
Working with Salesforce Data
Using Apex
Testing Components with Lightning Testing Service
Debugging
Performance
Reference
PDF

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Lightning Locker Disabled for Unsupported Browsers

Lightning Locker relies on some JavaScript features in the browser: support for strict mode, the Map object, and the Proxy object. If a browser doesn’t meet the requirements, Lightning Locker can’t enforce all its security features and is disabled.

Lightning Locker is disabled for unsupported browsers. If you use an unsupported browser, you’re likely to encounter issues that won’t be fixed. Make your life easier and your browsing experience more secure by using a supported browser.

The Lightning Locker requirements align with the supported browsers for Lightning Experience, except for IE11. Lightning Locker is disabled for IE11. We recommend using supported browsers other than IE11 for enhanced security.

Note