Re: [heycam/webidl] Add mixins (#433)

tobie commented on this pull request.



> +(matching <emu-nt><a href="#prod-IncludesStatement">IncludesStatement</a></emu-nt>)
+used to declare that all objects implementing an [=interface=] |I| (identified by the first [=identifier=])
+must additionally implement [=mixin=] |M| (identified by the second identifier).
+[=Interface=] |I| is said to <dfn>include</dfn> [=mixin=] |M|.
+
+<pre class="webidl" class="syntax">
+    interface_identifier includes mixin_indentifier;
+</pre>
+
+The first [=identifier=] must reference a [=callback interface|non-callback=] [=interface=] |I|.
+The second identifier must reference a [=mixin=] |M|.
+
+Each [=interface=] |I| that [=includes=] a [=mixin=] |M| must receive
+a copy of each of the [=mixin members|members=] of |M|.
+Each [=mixin member=] cooy is treated as if it had been declared on |I|.
+Its <dfn>host interface</dfn> is |I|.

I reformulated that paragraph. LMK if it's now clearer.

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