Step 13.3-4 in element definition should clarify the ordering

[rniwa]

Steps 13.3 and 13.4 of the element definition algorithm doesn't explicitly state the ordering of Get other than implicitly defining it via a map.

We should either call it an ordered map, or explicitly state the order by which these properties are obtained as they're observable via Proxy objects or getter.

[rniwa]

@domenic @annevk

[domenic]

Makes sense, I was assuming with my JavaScript background that it was an ordered map, but I should definitely should clarify.

[rniwa]

Yeah, it was pretty obvious that's what you meant from JS semantics but I think it's good to be explicit in specifications :)