Re: [push-api] Clarify subscription relationships, lifecycle, and uniqueness. (#112)

> @@ -223,14 +228,28 @@
>          The term <dfn>webapp server</dfn> refers to server-side components of a <a>webapp</a>.
>        </p>
>        <p>
> -        The term <dfn>push message</dfn> refers to an indication to a <a>webapp</a> that there is
> -        new information for it from the <a>webapp server</a>, all or part of which MAY be contained
> -        in the <a>push message</a> itself.
> +        A <dfn>push message</dfn> is an indication to a <a>webapp</a> that there is new information
> +        for it from the <a>webapp server</a>, all or part of which MAY be contained in the <a>push
> +        message</a> itself.
> +      </p>
> +      <p>
> +        A <dfn>push subscription</dfn> is a message delivery context that is established between
> +        the <a>user agent</a> and the <a>push service</a> on behalf of a <a>service worker
> +        registration</a>, and it is associated with that <a>service worker registration</a>. A
> +        <a>push subscription</a> MUST NOT persist longer than its associated <a>service worker
> +        registration</a>, but it MAY be terminated earlier.

Done.

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https://github.com/w3c/push-api/pull/112/files#r24086054