[css2] Some changes by Tantek: missing glyph and em box

bert-github · bert-github · commit 490d3dd18681 · 2002-07-08T22:52:59.000Z
--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%401895
diff --git a/css2/fonts.src b/css2/fonts.src
@@ -1,7 +1,7 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
         "http://www.w3.org/TR/1998/REC-html40-19980424/loose.dtd">
 <html lang="en">
-<!-- $Id: fonts.src,v 2.62 2002-06-29 21:18:58 bbos Exp $ -->
+<!-- $Id: fonts.src,v 2.63 2002-07-08 22:52:59 bbos Exp $ -->
 <HEAD>
 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <TITLE>Fonts</TITLE>
@@ -64,6 +64,11 @@ for a description of font and character encoding.
 <LI>If there is no font within the family selected in 2, then use a
 UA-dependent default 'font-family' and repeat step 2, using the best
 match that can be obtained within the default font.
+If a particular character cannot be displayed using this font, 
+then the UA has no suitable font for that character. 
+The UA shouldmap each character for which it has no suitable font 
+to a visible symbol chosen by the UA, preferably a "missing character" 
+glyph from one of the font faces available to the UA. 
 
 </OL>
 
@@ -111,7 +116,11 @@ by a comma to indicate that they are alternatives:
 body { font-family: gill, helvetica, sans-serif }
 </PRE>
 
-<P>There are two types of list values:
+<P>Although many fonts provide the "missing character" glyph,
+  typically an open box, as its name implies this should not be
+  considered a match.
+
+<P>There are two types of font family names:
 
 <DL>
 
@@ -366,6 +375,10 @@ property</H2>
 
 <!-- #include src=properties/font-size.srb -->
 
+<P>The font size corresponds to the em square, a concept used in typography.
+Note that certain glyphs may bleed outside their em squares. Values
+have the following meanings:</P>
+
 <DL>
 <DT><B>&lt;absolute-size&gt;</B>
 
