Lightning 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 Locker Service?
JavaScript ES5 Strict Mode Enforcement
DOM Access Containment
Secure Wrappers
Access to Supported JavaScript API Framework Methods Only
What Does Locker Service Affect?
Disabling Locker Service for a Component
Don’t Mix Component API Versions
Locker Service Disabled for Unsupported Browsers
Content Security Policy Overview
Using JavaScript
Using Apex
Lightning Data Service
Testing Components with Lightning Testing Service
Debugging
Fixing Performance Warnings
Reference
PDF

Newer Version Available

This content describes an older version of this product. View Latest

Locker Service Disabled for Unsupported Browsers

Locker Service 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, Locker Service can’t enforce all its security features and is disabled.

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

Note