In this release, we will:

• Do some internal prep' work
  • Enhance the structure of our repository
  • Track performance impact of our built files
• Update our browser support, which includes
  • Update our strategy for browser support
  • Update how we load JavaScript in browser
  • Reduce support for browsers dropped by our support strategy (especially Internet Explorer)
  • Implement newer techniques made available by our support strategy
• Clarify our JavaScript components' public API
• Remove compatibility mode
• Improve the readability and hover state of links by enabling the new link styles introduced in v3.12.0 by default
• Remove things deprecated as part of v4.x releases
• Update the design of the Tag component
• Publish the Task List component
• Ensure that v5 works with the Prototype Kit

Update and restructure documentation in Frontend and Design System sites for v4 and v5 #2186 This epic includes:

• Update Design System site content for v5 changes #2993
• Define and create new content needed for v5.0.0 of GOV.UK Frontend #311
• Create a new page highlighting v5 differences and how to migrate to v5 #315

Corresponding milestones in our other repositories capture the work specific to them:

• Design System
• Frontend Docs