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Content-class: urn:content-classes:message
Subject: Re: XHTML and backgrounds
Date: Fri, 28 Jul 2006 08:11:46 -0500
Message-ID: &lt;200607281511.47255.bert@w3.org&gt;
In-Reply-To: &lt;E7284FFB4887E745BE5D33625E9AEEB00267C389@cacexc10.americas.cpqcorp.net&gt;
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Thread-Topic: XHTML and backgrounds
thread-index: AcayR2SUAcI8o8OuR5aJBcto5HJs2A==
References: &lt;E7284FFB4887E745BE5D33625E9AEEB00267C389@cacexc10.americas.cpqcorp.net&gt;
From: &quot;Bert Bos&quot; &lt;bert@w3.org&gt;
To: &quot;Grant, Melinda&quot; &lt;melinda.grant@hp.com&gt;

This is a multi-part message in MIME format.

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Hello Melinda,

&gt; So is there any difference in XHTML between setting attributes on the
&gt; body versus the html elements?

Do you mean attributes or properties?

The &lt;html&gt; element doesn't have a bgcolor attribute, only &lt;body&gt; does.=20
And in XHTML1, the bgcolor attribute is still supposed to work the same=20
way as in HTML. (But CSS says that the way it works is subtly=20
different: In HTML documents, bgcolor=3D&quot;red&quot; is equivalent to 'body=20
{background-color: red}' in the user style sheet, except that it has=20
specificity=3D0. In XHTML documents, it is up to the UA to analyze the=20
document and construct an appropriate UA style sheet, e.g., with 'html=20
{background-color: red}'. See section 6.4.4:
http://www.w3.org/Style/Group/css2-src/cascade.html#q13)

As for CSS properties, there is absolutely nothing special about the=20
&lt;body&gt; element in XHTML. Setting 'body {background: red}' is no=20
different from 'div {background: red}', i.e., only the box of the body=20
itself is red.

The &lt;html&gt; element is the root element, so it is still special. And thus =

the only way in XHTML to set the background of the canvas is with 'html=20
{background:...}'

That is, unless...

&gt;
&gt; (I'm still trying to figure out how body and html attributes should
&gt; relate to @page attributes...)

... if we allow a 'background' property inside '@page', it presumably=20
causes a background to be rendered behind the background of the &lt;html&gt;=20
element, if any.


Bert
--=20
  Bert Bos                                ( W 3 C ) http://www.w3.org/
  http://www.w3.org/people/bos                               W3C/ERCIM
  bert@w3.org                             2004 Rt des Lucioles / BP 93
  +33 (0)4 92 38 76 92            06902 Sophia Antipolis Cedex, France

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&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 3.2//EN&quot;&gt;
&lt;HTML&gt;
&lt;HEAD&gt;
&lt;META HTTP-EQUIV=3D&quot;Content-Type&quot; CONTENT=3D&quot;text/html; =
charset=3Diso-8859-1&quot;&gt;
&lt;META NAME=3D&quot;Generator&quot; CONTENT=3D&quot;MS Exchange Server version =
6.5.7651.16&quot;&gt;
&lt;TITLE&gt;Re: XHTML and backgrounds&lt;/TITLE&gt;
&lt;/HEAD&gt;
&lt;BODY&gt;
&lt;!-- Converted from text/plain format --&gt;

&lt;P&gt;&lt;FONT SIZE=3D2&gt;Hello Melinda,&lt;/FONT&gt;
&lt;/P&gt;

&lt;P&gt;&lt;FONT SIZE=3D2&gt;&amp;gt; So is there any difference in XHTML between =
setting attributes on the&lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;&amp;gt; body versus the html elements?&lt;/FONT&gt;
&lt;/P&gt;

&lt;P&gt;&lt;FONT SIZE=3D2&gt;Do you mean attributes or properties?&lt;/FONT&gt;
&lt;/P&gt;

&lt;P&gt;&lt;FONT SIZE=3D2&gt;The &amp;lt;html&amp;gt; element doesn't have a bgcolor =
attribute, only &amp;lt;body&amp;gt; does. &lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;And in XHTML1, the bgcolor attribute is still =
supposed to work the same &lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;way as in HTML. (But CSS says that the way it works =
is subtly &lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;different: In HTML documents, =
bgcolor=3D&amp;quot;red&amp;quot; is equivalent to 'body &lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;{background-color: red}' in the user style sheet, =
except that it has &lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;specificity=3D0. In XHTML documents, it is up to the =
UA to analyze the &lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;document and construct an appropriate UA style sheet, =
e.g., with 'html &lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;{background-color: red}'. See section 6.4.4:&lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;&lt;A =
HREF=3D&quot;http://www.w3.org/Style/Group/css2-src/cascade.html#q13&quot;&gt;http://w=
ww.w3.org/Style/Group/css2-src/cascade.html#q13&lt;/A&gt;)&lt;/FONT&gt;
&lt;/P&gt;

&lt;P&gt;&lt;FONT SIZE=3D2&gt;As for CSS properties, there is absolutely nothing =
special about the &lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;&amp;lt;body&amp;gt; element in XHTML. Setting 'body =
{background: red}' is no &lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;different from 'div {background: red}', i.e., only =
the box of the body &lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;itself is red.&lt;/FONT&gt;
&lt;/P&gt;

&lt;P&gt;&lt;FONT SIZE=3D2&gt;The &amp;lt;html&amp;gt; element is the root element, so it is =
still special. And thus &lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;the only way in XHTML to set the background of the =
canvas is with 'html &lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;{background:...}'&lt;/FONT&gt;
&lt;/P&gt;

&lt;P&gt;&lt;FONT SIZE=3D2&gt;That is, unless...&lt;/FONT&gt;
&lt;/P&gt;

&lt;P&gt;&lt;FONT SIZE=3D2&gt;&amp;gt;&lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;&amp;gt; (I'm still trying to figure out how body and =
html attributes should&lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;&amp;gt; relate to @page attributes...)&lt;/FONT&gt;
&lt;/P&gt;

&lt;P&gt;&lt;FONT SIZE=3D2&gt;... if we allow a 'background' property inside =
'@page', it presumably &lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;causes a background to be rendered behind the =
background of the &amp;lt;html&amp;gt; &lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;element, if any.&lt;/FONT&gt;
&lt;/P&gt;
&lt;BR&gt;
&lt;BR&gt;

&lt;P&gt;&lt;FONT SIZE=3D2&gt;Bert&lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;-- &lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;&amp;nbsp; Bert =
Bos&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbs=
p;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp=
;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; ( W 3 C ) &lt;A =
HREF=3D&quot;http://www.w3.org/&quot;&gt;http://www.w3.org/&lt;/A&gt;&lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;&amp;nbsp; &lt;A =
HREF=3D&quot;http://www.w3.org/people/bos&quot;&gt;http://www.w3.org/people/bos&lt;/A&gt;&amp;nb=
sp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbs=
p;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp=
;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; W3C/ERCIM&lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;&amp;nbsp; =
bert@w3.org&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;n=
bsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nb=
sp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; 2004 Rt des Lucioles / BP 93&lt;/FONT&gt;

&lt;BR&gt;&lt;FONT SIZE=3D2&gt;&amp;nbsp; +33 (0)4 92 38 76 =
92&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; =
06902 Sophia Antipolis Cedex, France&lt;/FONT&gt;
&lt;/P&gt;

&lt;/BODY&gt;
&lt;/HTML&gt;
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