[css-snap-size] Refined minor definitions

Author: kojiishi

css-snap-size/Overview.bs

@@ -28,8 +28,8 @@ Snapping Heights: the 'snap-height' property {#snap-height}
 
 <pre class='propdef'>
   Name: snap-height
-  Value: none | <<length>> <<integer>>?
-  Initial: none
+  Value: <<length>> <<integer>>?
+  Initial: 0px
   Applies to: block, flex and grid containers
   Inherited: yes
   Animatable: no
@@ -41,21 +41,18 @@ Snapping Heights: the 'snap-height' property {#snap-height}
 Values have the following meanings:
 
 <dl dfn-for="snap-height">
-  <dt><dfn>none</dfn>
-  <dd>
-    This value indicates that there is no snapping behavior.
   <dt><<length>>
   <dd>
     This value defines the <dfn>grid unit</dfn>.
-    Positive values are valid.
+    Non-negative lengths are valid.
   <dt><<integer>>
   <dd>
     This value defines the <dfn>grid baseline position</dfn>
     within the <a>grid unit</a>.
     Values between 1 and 100 (inclusive) are valid.
 </dl>
 
-When the <a>grid unit</a> is set,
+When the <a>grid unit</a> is set to a positive length,
 the line box heights are rounded <i>up</i> to
 the closest multiple of the unit.
 
@@ -121,7 +118,7 @@ Snapping Baselines {#snap-baseline}
     >
 </div>
 
-When the <a>grid baseline position</a> is a positive number equals to or less than 1,
+When the <a>grid baseline position</a> is a positive value less than or equals to 100,
 the additional spaces are distributed using the following formula:
 
 * space-over = BP - T % GU, add GU if negative