[css2] rewrote the rule about "borrowing" background from the BODY element as

howcom · howcom · commit 6cd1edd063ff · 1997-11-04T14:41:56.000Z
a an exception to the general rule that backgrounds are based on the
root element.

added comment about braille printers

rewrote the description of the SCREEN and PROJECTOR media types

minor tweaks

--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%40370
diff --git a/css2/media.src b/css2/media.src
@@ -1,6 +1,6 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
 <html lang="en">
-<!-- $Id: media.src,v 1.21 1997-10-30 08:36:32 ian Exp $ -->
+<!-- $Id: media.src,v 1.22 1997-11-04 14:41:56 howcome Exp $ -->
 <HEAD>
 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <TITLE>Media types</TITLE>
@@ -128,26 +128,28 @@ unconditional. Specifying 'all' for the medium has the same effect.
 
 <p>Due to rapidly changing technologies, CSS2 does not specify a
 definitive list of media types that may be values for <span
-class="index-inst" title="@media"> @media.</span> However, user agents
+class="index-inst" title="@media">@media</span>. However, user agents
 that elect to support the devices in the following list must recognize
 the associated media type:
 
 <ul>
-<li><samp>SCREEN:</samp> intended primarily for scrolled computer
-screens, but many properties also apply to print and projection media
-as well. This is the default value. See the section on 
+
+<li><samp>SCREEN:</samp> intended primarily for scrolled color computer
+screens. See the section on 
 <a href="#scrolled-media">scrollable media</a> for more information.
 
 <li><samp>PRINT:</samp> intended for paged, opaque
   material and for documents viewed on screen in print preview mode.
 Please consult the section on <a href="page.html">paged media</a> for
 information about formatting issues that are specific to paged media.
 
-<li><samp>PROJECTION:</samp> intended for projectors.
+<li><samp>PROJECTION:</samp> intended for projected presentations, for
+example projectors or print to transparencies.
 Please consult the section on <a href="page.html">paged media</a> for
 information about formatting issues that are specific to paged media.
 
-<li><samp>BRAILLE:</samp> intended for braille tactile feedback devices.
+<li><samp>BRAILLE:</samp> intended for braille tactile feedback
+devices. [HWL: we should also have a media type for Braille printers]
 
 <li><samp>AURAL:</samp> intended for speech synthesizers. See the 
 section on <a href="./aural.html">aural style sheets</a> for details.
@@ -166,11 +168,11 @@ screen, monochrome, limited bandwidth).
 <H3><a name="canvas">The canvas</a></H3> 
 
 <P>For all media, the term <span class="index-def" title="canvas">
-canvas</span> means "the space where the various models generate the
-tree of rendering objects" (see the <a href="process.html">CSS2
+canvas</span> means "the space where rendering objects are rendered" 
+(see the <a href="process.html">CSS2
 process model</a>).  For a screen, the canvas is a rectangular space
 generally of fixed width and "infinite" length. For paged media, the
-canvas is a rectangular space generally of fixed width and height.
+canvas is a sequence of rectangular page boxes of fixed width and height.
 For aural media, the canvas is a three dimensional audio space.
 
 <H4><a name="scrolled-media">Scrollable media</a></H4>
@@ -187,15 +189,17 @@ mechanism to bring hidden parts into view.
 <P>The user agent generally determines the width of the canvas and may
 change the dimensions of the canvas when the viewport is resized.
 
-<P>When an HTML document doesn't cover the entire canvas, user agents
-should display the background according to the following algorithm: if
+<P>In general, when a document doesn't cover the entire canvas, the
+User agent should "borrow" the background of the root element. Since
+the BODY element is often percieved as the root element in HTML, this
+special rules apply to HTML documents: if
 the <span class="propinst-background">'background'</span> value of the
 HTML element is different from 'transparent' then use it, else use the
 <span class="propinst-background">'background'</span> value of the
 BODY element. If the resulting value is 'transparent', the rendering
 is undefined.
 
-<P>This rule allows the following, for example:
+<P>This rule allows the following:
 
 <div class="example"><P>
 <PRE>
