Merge pull request #11 from w3c/fix-proximity-ref

Adjust reference to page-visibility algorithm

Author: anssiko

index.html

@@ -169,8 +169,8 @@ 
         <var>patternvar> to <a>validate and normalizea>.
         li>
         <li>If the result of running the steps to <a href=
-        "https://w3c.github.io/page-visibility/#dfn-steps-to-determine-if-the-document-is-hidden">
-          determine if the document is hiddena> [[!PAGE-VISIBILITY]] is true,
+        "https://w3c.github.io/page-visibility/#dfn-steps-to-determine-the-visibility-state">
+          determine the visibility statea> [[!PAGE-VISIBILITY-2]] is not <code>visiblecode>,
           then return false and terminate these steps.
           <div class="note">
             A trusted (also known as privileged) application that integrates