Lightning Components: Lightning Web Components Open Source, Lightning Web Components as Custom Tabs

The Lightning Web Components framework is now open source, empowering you to build enterprise-ready web components on any platform. On the Salesforce Platform, you can add a Lightning web component as a custom tab in a Lightning Experience app and in the Salesforce app. We have several critical updates too.
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Note

Looking for new and changed Lightning web components, Aura components, and Aura component interfaces? We’ve consolidated the lists of new and changed items at the end of the Development section.