Handle non-fully-active documents (#219)

Author: marcoscaceres

index.html

@@ -172,10 +172,16 @@ <h4>
             |data:ShareData|, run the following steps:
           </p>
           <ol class="algorithm">
-            <li>If the [=current settings object=]'s [=environment settings
-            object/responsible document=] is not [=allowed to use=]
-            <a>"web-share"</a>, return [=a promise rejected with=] a
-            {{"NotAllowedError"}} {{DOMException}}.
+            <li>Let |document:Document| be the [=current settings object=]'s
+            [=environment settings object/responsible document=].
+            </li>
+            <li>If |document| is not [=Document/fully active=], return [=a
+            promise rejected with=] an {{"InvalidStateError"}}
+            {{DOMException}}.
+            </li>
+            <li>If |document| is not <a>allowed to use</a> <a>"web-share"</a>,
+            return [=a promise rejected with=] a {{"NotAllowedError"}}
+            {{DOMException}}.
             </li>
             <li>If [=this=].{{Navigator/[[sharePromise]]}} is not `null`,
             return [=a promise rejected with=] an {{"InvalidStateError"}}
@@ -296,9 +302,10 @@ <h3>
             {{ShareData}} |data:ShareData|, run the following steps:
           </p>
           <ol class="algorithm">
-            <li>If the [=current settings object=]'s [=environment settings
-            object/responsible document=] is not <a>allowed to use</a>
-            <a>"web-share"</a>, return false.
+            <li>Let |document:Document| be the [=current settings object=]'s
+            [=environment settings object/responsible document=].
+            </li>
+            <li>If |document| is not [=Document/fully active=], return false.
             </li>
             <li>Return the result of [=validate share data=] with |data| and
             [=this=]'s [=relevant settings object=]'s [=environment settings