Re: [whatwg/storage] Clarify storage infrastructure (#86)

@annevk commented on this pull request.



> +the first time.
+
+<p>A <dfn>storage map</dfn> is a <a for=/>map</a> of <a>storage keys</a> to <a>storage units</a>. It
+is initially empty.
+
+<p>To <dfn>obtain a storage unit</dfn>, given a <a for=/>storage map</a> <var>map</var>, an
+<a>environment settings object</a> <var>environment</var>, and a <a>storage type</a>
+<var>type</var>, run these steps:
+
+<ol>
+ <li><p>Let <var>key</var> be <var>environment</var>'s
+ <a for="environment settings object">origin</a>.
+
+ <li><p>If <var>key</var> is an <a>opaque origin</a>, then return failure.
+
+ <li><p>If the user has disabled storage, then return failure.

Maybe as a follow-up? I'm not entirely sure what that would look like, but happy for someone to take a stab at it.

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