[css-inline] add hanging baseline scripts to procedure for automatically determining alignment points

Author: dauwhe

css-inline/Overview.bs

@@ -515,11 +515,15 @@ are automatically determined from its contents:
 		use its <a>over</a> and <a>under</a> content-box edges.
 		<li>Else if the <a>initial letter</a> contains any character from the Han, Hangul, Kana, or Yi <a>Unicode scripts</a>,
 		use the ideographic character face bottom and top edge baselines.
+		<li>Else if the <a>initial letter</a> contains any character from the Devanagari, Bengali, and Gurmukhi <a>Unicode scripts</a>,
+		use the hanging and alphabetic baselines.
 		<li>Else if the <a>initial letter</a> contains any character from the Hebrew <a>Unicode scripts</a>,
 		use the ideographic character face bottom and top edge baselines.
 		<li>Else use the alphabetic and cap-height baselines.
 	</ol>
 
+Issue: What is the proper alignment for South Asian scripts that do not have the explicit hanging baseline, such as Tamil or Telugu?
+
 Note: The ordering of keywords in this property is fixed in case ''border-box''
 is expanded to ''[ border-box | alphabetic | ideographic | hebrew | hanging ]''
 to allow explicitly specifying the <a>initial letter</a>’s alignment points.