Web Compatibility Bugs

• <math> doesn't work #1593
  • Repro: Failing test for math elements #1660
• [Quest]: Proper ShadowDOM support emberjs/ember.js#20644
  • [Bug] declarative ShadowDOM is unable to have content rendered in to it emberjs/ember.js#20642
    • Repro: Failing test for declarative shadow-dom #1661
  • [Bug] #in-element cannot directly render in to shadow-dom emberjs/ember.js#20641
  • [Bug] in-element cannot render into a document-fragment emberjs/ember.js#20643
  • Improve builtin shadow-dom workflow [add shadow node opcode] #1195

Reactivity Bugs

• Bug: inline if helper doesn't work when condition is an arg #1642
  • Repro: Failing test for inline-if component return #1657

Parser Bugs

• fails to parse some html comments #1487

Completion Bugs / needs implemented (merged RFCs exist already)

aka, not bugs

• element
  https://github.com/emberjs/rfcs/blob/master/text/0287-promote-in-element-to-public-api.md
  • Advance RFC #0389 "Dynamic tag names in glimmer templates." (ember-element-helper) to Stage Ready for Release emberjs/rfcs#1049
• on
  https://github.com/emberjs/rfcs/blob/master/text/0997-make-on-built-in.md
  • existing implementation has potentially incorrect implementation
    [Bug] DX: due to destruction happening "at any time" / asynchronously, we cannot ergonomically use a conditional on modifier (aka conditional on modifiers are not possible if the condition goes from true to true)) emberjs/ember.js#20647
• on: (syntax that expands for all modifiers)
• hash
  https://github.com/emberjs/rfcs/blob/master/text/0999-make-hash-built-in.md
• method call syntax
• fn
  https://github.com/emberjs/rfcs/blob/master/text/0998-make-fn-built-in.md
• array
  https://github.com/emberjs/rfcs/blob/master/text/1000-make-array-built-in.md
• tracked-built-ins
  tracked-built-ins built-in emberjs/rfcs#1068
  • Implement trackedArray(data, { equals, description }) #1713

In the future

• prop: