Re: [w3c/ServiceWorker] Editorial: update to modern Web IDL conventions (#1528)

@jakearchibald commented on this pull request.



>          1. Let |scopeURL| be null.
-        1. If |options|.{{RegistrationOptions/scope}} is <a>present</a>, set |scopeURL| to the result of <a lt="URL parser">parsing</a> |options|.{{RegistrationOptions/scope}} with the <a>context object</a>'s <a>relevant settings object</a>'s <a>API base URL</a>.
-        1. Invoke [=Start Register=] with |scopeURL|, |scriptURL|, |p|, |client|, |client|'s <a>creation URL</a>, |options|.{{RegistrationOptions/type}}, and |options|.{{RegistrationOptions/updateViaCache}}.
+        1. If |options|["{{RegistrationOptions/scope}}"] [=map/exists=], set |scopeURL| to the result of <a lt="URL parser">parsing</a> |options|["{{RegistrationOptions/scope}}"] with [=this=]'s <a>relevant settings object</a>'s <a>API base URL</a>.

Ohhh TIL!

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