[css-fonts-5] sketch out font-size descriptor w3c#806

Author: svgeesus

css-fonts-5/Overview.bs

@@ -56,6 +56,8 @@ For readability they have not been repeated explicitly.
 <h2 id="basic-font-props">
 Basic Font Properties</h2>
 
+Issue(126):
+
 <h3 id="font-family-prop">
     Font family: the 'font-family!!property' property</h3>
 
@@ -115,6 +117,29 @@ Issue(731):
 
 Issue(5892):
 
+<pre class='descdef'>
+    Name: font-size
+    Value: auto | [<<number>>]#
+    Initial: normal
+    For: @font-face
+    </pre>
+
+<dl dfn-type="value" dfn-for="@font-face/font-size">
+    <dt><dfn>auto</dfn></dt>
+    <dd>
+        The font matches any font size
+    </dd>
+    <dt><dfn><<number>></dfn></dt>
+    <dd>
+        If a single <<number>> is given
+        the font matches that specific font size, only.
+        If two <<number>>s are given,
+        they specify a range of font sizes which will match.
+    </dd>
+</dl>
+
+
+
 
 <!-- should this stay in Fonts 4 or be here in Fonts 5? -->