[css-text-decor] Use 'auto' rather than 'over' in UA default rules to avoid compat problems. <https://www.w3.org/mid/5C756B1C-F03B-4CA7-8796-7A6EEBC34C32@apple.com>

Author: fantasai

css-text-decor/Overview.bs

@@ -944,9 +944,10 @@ Appendix B: Default UA Stylesheet</h2>
 
         /* set language-appropriate default underline position */
         :root:lang(ja), [lang|=ja],
-        :root:lang(ko), [lang|=ko] { text-underline-position: under right; }
+        :root:lang(ko), [lang|=ko] { text-underline-position: auto right; }
         :root:lang(zh), [lang|=zh],
-        :root:lang(mn), [lang|=mn] { text-underline-position: under left;  }
+        :root:lang(mn), [lang|=mn] { text-underline-position: auto left;  }
+        /* auto is used above instead of under due to content-compatibility concerns */
         [lang]:not([lang|=zh], [lang|=ja], [lang|=ko], [lang|=mn]) {
            text-underline-position: auto;
         }
@@ -956,7 +957,7 @@ Appendix B: Default UA Stylesheet</h2>
     <p class="issue">
       If you find any issues, recommendations to add, or corrections,
       please send the information to <a href="mailto:www-style@w3.org">www-style@w3.org</a>
-      with <kbd>[SHORTNAME]</kbd> in the subject line.
+      with <kbd>[css-text-decor]</kbd> in the subject line.
 
     <div class='example'>
       <p>