Re: [WICG/webcomponents] Reference Target: what type should the `referenceTarget` attribute be? (Issue #1093)

I left out an important part of (1); I should have made a table:

| Option | Type | `""` is | `null` is |
| - | - | - | - |
| 1 | `DOMString?` | equivalent to invalid ID | equivalent to un-set |
| 2 | `DOMString` | equivalent to un-set | converted to `"null"`, likely invalid |
| 3 | `DOMString` | equivalent to invalid ID | converted to `"null"`, likely invalid |

So, to answer @Westbrook's questions:
  
> * In no. 1, how would setting to `""` be different than setting to `null`?

`""` is not a valid ID, so it's treated the same as any other invalid ID value.

> * In no. 2, what would setting to `null` do?

It's converted to a string, `"null"`.


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