[css-text-3] Bugfixes to text-align/text-align-all per #2577 (comment) #2577

Author: fantasai

css-text-3/Overview.bs

@@ -1329,7 +1329,7 @@ Shaping Across Intra-word Breaks</h3>
     Initial: start
     Applies to: block containers
     Inherited: yes
-    Computed value: as specified, except for ''match-parent'' which computes as defined below
+    Computed value: See individual properties
     Canonical order: n/a
     </pre>
 
@@ -1338,7 +1338,10 @@ Shaping Across Intra-word Breaks</h3>
       and describes how the inline-level content of a block
       is aligned along the inline axis
       if the content does not completely fill the line box.
-      Values have the following meanings:</p>
+      Values other than ''justify-all'' are assigned to 'text-align-all'
+      and reset 'text-align-last' to ''text-align-last/auto''.
+
+    Values have the following meanings:
 
     <dl dfn-for=text-align dfn-type=value>
     <dt><dfn>start</dfn></dt>
@@ -1367,18 +1370,18 @@ Shaping Across Intra-word Breaks</h3>
         Unless otherwise specified by 'text-align-last',
         the last line before a forced break or the end of the block is ''start''-aligned.
     <dt><dfn>justify-all</dfn></dt>
-      <dd>Same as ''justify'', except 'text-align-last' is also set to ''justify'',
+      <dd>Sets both 'text-align' and 'text-align-last' to ''text-align/justify'',
         forcing the last line to justify as well.
     <dt><dfn>match-parent</dfn></dt>
       <dd>This value behaves the same as ''inherit''
         (computes to its parent's computed value)
-        except that an inherited ''start'' or ''end'' keyword
-        is interpreted against its parent's 'direction' value
+        except that an <a>inherited value</a> of ''start'' or ''end''
+        is interpreted against the parent’s
+        (or the <a>initial containing block</a>’s, if there is no parent)
+        'direction' value
         and results in a computed value of either 'left' or 'right'.
     </dl>
 
-    <p>All values except ''justify-all'' reset 'text-align-last' to ''text-align-last/auto''.
-
     <p>A block of text is a stack of
       <a href="https://www.w3.org/TR/CSS21/visuren.html#line-box">line boxes</a>.
       This property specifies how the inline-level boxes within each line box
@@ -1412,6 +1415,7 @@ Shaping Across Intra-word Breaks</h3>
     Initial: start
     Applies to: block containers
     Inherited: yes
+    Computed value: as specified, except for ''match-parent'' which computes as defined above
     Canonical order: n/a
     </pre>