Improve switch statement

Author: noamr

fetch.bs

@@ -7011,41 +7011,44 @@ descendants share a quota of 384 kibibytes. That value is computed as such:
 
 <ol>
  <li><p>Let <var>navigable</var> be <var>controlDocument</var>'s <a>node navigable</a>.
+
+ <li><p>Let <var>isTopLevel</var> be true if <var>controlDocument</var>'s <a>node navigable</a> is a
+ <a for=/>top-level traversable</a>; otherwise false.
+
+ <li><p>Let <var>deferredFetchAllowed</var> be true if <var>controlDocument</var> is
+ <a>allowed to use</a> the <a>policy-controlled feature</a> "{{PermissionsPolicy/deferred-fetch}}";
+ otherwise false.
+
+ <li><p>Let <var>deferredFetchMinimalAllowed</var> be true if <var>controlDocument</var> is
+ <a>allowed to use</a> the <a>policy-controlled feature</a>
+ "{{PermissionsPolicy/deferred-fetch-minimal}}"; otherwise false.
+
  <li>
   <p>Let <var>quota</var> be the result of the first matching statement:
 
   <dl class=switch>
-   <dt><var>controlDocument</var>'s <a>node navigable</a> is a
-   <a for=/>top-level traversable</a> and <var>controlDocument</var> is not <a>allowed to use</a>
-   the <a>policy-controlled feature</a> "{{PermissionsPolicy/deferred-fetch}}"
+   <dt><var>isTopLevel</var> is true and <var>deferredFetchAllowed</var> is false
    <dd>0
 
-   <dt><var>controlDocument</var>'s <a>node navigable</a> is a
-   <a for=/>top-level traversable</a> and <var>controlDocument</var> is not <a>allowed to use</a>
-   the <a>policy-controlled feature</a> "{{PermissionsPolicy/deferred-fetch-minimal}}"
+   <dt><var>isTopLevel</var> is true and <var>deferredFetchMinimalAllowed</var> is false
    <dd>
     <p>640 kibibytes
     <p class="note allow-2119">640kb should be enough for everyone.
 
-   <dt><var>controlDocument</var>'s <a>node navigable</a> is a <a for=/>top-level traversable</a>
-   and  <a>allowed to use</a> the
-   <a>policy-controlled feature</a> "{{PermissionsPolicy/deferred-fetch-minimal}}"
+   <dt><var>isTopLevel</var> is true
    <dd>
     <p>512 kibibytes
     <p class=note>The default of 640 kibibytes, decremented By
     <a>quota reserved for <code>deferred-fetch-minimal</code></a>)
 
-
-   <dt><var>controlDocument</var>'s <a>node navigable</a>'s <a>navigable container</a>'s
-   <a>reserved deferred-fetch quota</a> is <a for="reserved deferred-fetch quota">normal quota</a>,
-   and <var>controlDocument</var> is <a>allowed to use</a> the <a>policy-controlled feature</a>
-   "{{PermissionsPolicy/deferred-fetch}}"
+   <dt><var>deferredFetchAllowed</var> is true, and <var>navigable</var>'s
+   <a>navigable container</a>'s <a>reserved deferred-fetch quota</a> is
+   <a for="reserved deferred-fetch quota">normal quota</a>
    <dd><a for="reserved deferred-fetch quota">normal quota</a>
 
-   <dt><var>controlDocument</var>'s <a>node navigable</a>'s <a>navigable container</a>'s
-   <a>reserved deferred-fetch quota</a> is <a for="reserved deferred-fetch quota">minimal quota</a>,
-   and <var>controlDocument</var> is <a>allowed to use</a> the <a>policy-controlled feature</a>
-   "{{PermissionsPolicy/deferred-fetch-minimal}}"
+   <dt><var>deferredFetchMinimalAllowed</var> is true, and <var>navigable</var>'s
+   <a>navigable container</a>'s <a>reserved deferred-fetch quota</a> is
+   <a for="reserved deferred-fetch quota">minimal quota</a>
    <dd><a for="reserved deferred-fetch quota">minimal quota</a>
   </dl>