[css-when-else] wordsmith

css-when-else/index.bs

@@ -83,15 +83,16 @@ Chained Conditionals: the ''@else'' rule {#else-rule}
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 Usually, <a>conditional group rules</a> are independent;
-each one has a separate condition,
+each one has a separate condition
 evaluated without direct reference to any other rule,
-and decides whether or not to apply their contained rules
-based solely on their condition.
+and decides whether or not to apply its contained rules
+based solely on its condition.
 
 This is fine for simple conditions,
 but makes it difficult to write a collection of conditionals that are meant to be mutually exclusive;
 authors have to very carefully craft their conditions to not activate when the other rules are meant to,
-and make sure the collection of conditionals don't accidentally <em>all</em> exclude some situation.
+and make sure the collection of conditionals don't accidentally <em>all</em> exclude some situation
+which is then left unstyled.
 
 The <dfn>@else</dfn> rule is a <a>conditional group rule</a>
 used to form <a>conditional rule chains</a>,