[css-text] tab-size applies to inlines

Closes w3c#5489

Author: frivoal

css-text-3/Overview.bs

@@ -1594,7 +1594,8 @@ Order of Operations</h4>
         If this distance is less than 0.5<a href="https://www.w3.org/TR/css-values-3/#ch">ch</a>,
         then the subsequent <a>tab stop</a> is used instead.
         <dfn lt="tab stop">Tab stops</dfn> occur at points that are multiples of the [=tab size=]
-        from the block's starting content edge.
+        from the starting content edge
+        of the [=preserved=] [=tab=]'s nearest [=block container=] ancestor.
         The [=tab size=] is given by the 'tab-size' property.
 
         <wpt>
@@ -2067,7 +2068,7 @@ Order of Operations</h4>
     Name: tab-size
     Value: <<number>> | <<length>>
     Initial: 8
-    Applies to: block containers
+    Applies to: inline boxes
     Inherited: yes
     Computed value: the specified number or absolute length
     Animation type: by computed value type
@@ -2085,7 +2086,8 @@ Order of Operations</h4>
     </wpt>
 
     <p>This property determines the <dfn id=tab-size-dfn>tab size</dfn> used to render [=preserved=] tab characters (U+0009).
-      A <<number>> represents the measure as a multiple of the space character's advance width (U+0020)
+      A <<number>> represents the measure as a multiple of the advance width of the space character (U+0020)
+      of the nearest [=block container=] ancestor of the [=preserved=] [=tab=],
       including its associated 'letter-spacing' and 'word-spacing'.
       Negative values are not allowed.