Re: [heycam/webidl] State that by default all objects are created in the relevant realm of `this` (#135)

Cool, thanks for the example. https://html.spec.whatwg.org/multipage/comms.html#dom-window-postmessage creates the events inside a task, rather than in parallel, and it'd be straightforward to reset the default when queuing a task...

My main concern is that verbosity and repetition hurt readability. If we insist that every object creation in parallel code specify a realm, and that realm is the same for most calls, it makes it harder to follow the rest of the algorithm and obscures the few cases where the realm is importantly different.

Are we differing in how often we expect parallel code to need to change the realm? Most of the new specs I'm seeing do a lot of work in parallel but don't shift realms much if ever. When you and @bzbarsky go through existing specs to specify their new objects' realms, do you tend to find that you'd want them to shift realms when they go parallel?

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