Filing this issue as a central place to track open questions about reference target.

Blocking Phase 1:

• Reference Target: How to handle invalid ID references? #1071
• Reference Target: Should the form and list JavaScript attributes return the host element? #1072
• Reference Target naming #1087
• Reference Target: what type should the referenceTarget attribute be? #1093
• Reference Target: How should we treat invalid reference targets for relations set via Element IDL attributes? #1089
• Reference Target: Which attributes are in scope? #1091
• Reference Target: How to handle events fired on the reference target by related elements? #1098

Blocking Phase 2:

• An issue still needs to be filed on this, but we received feedback at TPAC and from the TAG that the microsyntax proposed for phase 2 is undesirable. We should reconsider using separate attributes for each property to be redirected.
• In phase 2, how can an author indicate that references for a given property should not be forwarded?

Non-blocking:

• Depending on the outcome of IDREF attributes are fragile and painful to use w3ctag/gaps#2, should something in addition to IDRefs be supported?

For Chromium implementation TODOs, see here.

See also whatwg/html#10707.