Backport Reboot's th updates

mdo · XhmikosR · commit a03b2feff21e · 2020-10-05T16:12:47.000+03:00
Manually backports #30781 to v4.
diff --git a/scss/_reboot.scss b/scss/_reboot.scss
@@ -278,10 +278,14 @@ caption {
   caption-side: bottom;
 }
 
+// 1. Removes font-weight bold by inheriting
+// 2. Matches default `<td>` alignment by inheriting `text-align`.
+// 3. Fix alignment for Safari
+
 th {
-  // Matches default `<td>` alignment by inheriting from the `<body>`, or the
-  // closest parent with a set `text-align`.
-  text-align: inherit;
+  font-weight: $table-th-font-weight; // 1
+  text-align: inherit; // 2
+  text-align: -webkit-match-parent; // 3
 }
 
 
diff --git a/scss/_variables.scss b/scss/_variables.scss
@@ -363,6 +363,7 @@ $table-border-color:          $border-color !default;
 
 $table-head-bg:               $gray-200 !default;
 $table-head-color:            $gray-700 !default;
+$table-th-font-weight:        null !default;
 
 $table-dark-color:            $white !default;
 $table-dark-bg:               $gray-800 !default;
