From: Atsushi Nakamura (nakamura.atsushi318@canon.co.jp)
Date: Thu Sep 28 2006 - 02:53:33 EDT
Melinda,
A couple of comments on this topic ;
Canon thinks that the <HTML> element merely defines the container for the
(X)HTML source document.
> * Is a font property set within an @page rule applied to the page
> content area (unless overridden by properties set on elements
> rendered on the page), or just to the contents of the page margin
> boxes? [Proposed Answer: Just to the margin boxes.]
Canon thinks that a font property set within an @page rule will be
applied (inherited, may be the correct word) to the page content area,
unless overridden by properties set on elements appearing within the page content area.
> * On the last page of a document, do the html and body properties
> terminate immediately after the last content, or at the bottom of
> the page (e.g., do the html and body margins get drawn right below
> the last paragraph, or at the bottom of the page? [Immediately
> after content.]
We think the body margin should extend to the bottom of the page (defined by @page)
Our understanding is that since the body is considered the "canvas where the content
appears", it should be the underlining container which includes the area specified by @page.
> * Similarly, on the last page, do the page bg, border, etc. extend
> to the bottom of the page, or terminate after the last
> content? [bottom of the page]
This is Agreed.
Regards,
Ats Nakamura
Canon
Grant, Melinda wrote:
> From HP's perspective (and I think we're not alone), the CSS
> specification is difficult to interpret with respect to how margins,
> borders, padding, and backgrounds work when applied to the <body> and
> <html> elements. Recently we have learned that the CSS3 Paged Media
> module is not clear on how the same properties used within an @page
> context should interact with the html properties.
>
> I'd like to share my new-and-improved understanding based on discussions
> within the CSS WG: ;-)
>
> * First, there are html attributes and there are css properties. In
> html, the body element has a bgcolor attribute, but the html
> element does not. For XHTML documents, the UA (printer) must
> convert the body bgcolor attribute into an equivalent printer
> style rule:
> So <body bgcolor="red"> gets converted into the printer stylesheet
> rule: body {background-color: red}. (This gets a bit more
> complicated for HTML documents, but we don't need to go there.)
> This printer stylesheet rule will be overridden by an author
> stylesheet rule, should one exist. See
> http://www.w3.org/Style/Group/css2-src/cascade.html#q13.
> * The body element is no different when it comes to CSS styling from
> any other element. Backgrounds, margins etc behave just as they
> do for a div, for example.
> * The html element is the root element. It can also be selected
> with ':root'. It is special, in that a background is applied to
> the margins as well as the content area. This is because it
> 'paints the canvas', which is infinite. The only way in XHTML to
> put a background in the html margin area and/or the body margin
> area is to use a background on the html element. (See
> http://www.w3.org/TR/CSS21/colors.html#q2.)
> * The attached file, 'margin-both.xhtml' when opened with Firefox,
> provides an example of how html and body edgings should be rendered.
>
> There are still some open questions about how @page properties work. I
> am hoping to publish a new version within the next week or so that will
> resolve questions such as the following: [My proposed answers are in
> brackets.]
>
> * Is a font property set within an @page rule applied to the page
> content area (unless overridden by properties set on elements
> rendered on the page), or just to the contents of the page margin
> boxes? [Proposed Answer: Just to the margin boxes.]
> * Do the html and page margins collapse? [no]
> * Are html and body borders closed at the bottom of each page, or
> just at the end of the document? [Just at the end of the document]
> * Does a background property set within an @page rule get applied to
> the page margins? [Yes] To the page area unless obscured by html,
> body, or other backgrounds? [????, under discussion]
> * On the last page of a document, do the html and body properties
> terminate immediately after the last content, or at the bottom of
> the page (e.g., do the html and body margins get drawn right below
> the last paragraph, or at the bottom of the page? [Immediately
> after content.]
> * Similarly, on the last page, do the page bg, border, etc. extend
> to the bottom of the page, or terminate after the last
> content? [bottom of the page]
> * Others?
>
> Best regards,
>
> Melinda
>
>
> _____
>
> HP - Melinda Grant
> Connectivity Standards
> Consumer Printing and Imaging
> +1 (541) 582-3681
> melinda.grant@hp.com
> _____
>
>
>
> ------------------------------------------------------------------------
>
> Subject:
> Re: XHTML and backgrounds
> From:
> "Bert Bos" <bert@w3.org>
> Date:
> Fri, 28 Jul 2006 08:11:46 -0500
> To:
> "Grant, Melinda" <melinda.grant@hp.com>
>
> To:
> "Grant, Melinda" <melinda.grant@hp.com>
>
>
> Hello Melinda,
>
> > So is there any difference in XHTML between setting attributes on the
> > body versus the html elements?
>
> Do you mean attributes or properties?
>
> The <html> element doesn't have a bgcolor attribute, only <body> does.
> And in XHTML1, the bgcolor attribute is still supposed to work the same
> way as in HTML. (But CSS says that the way it works is subtly
> different: In HTML documents, bgcolor="red" is equivalent to 'body
> {background-color: red}' in the user style sheet, except that it has
> specificity=0. In XHTML documents, it is up to the UA to analyze the
> document and construct an appropriate UA style sheet, e.g., with 'html
> {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
> <body> element in XHTML. Setting 'body {background: red}' is no
> different from 'div {background: red}', i.e., only the box of the body
> itself is red.
>
> The <html> 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
> {background:...}'
>
> That is, unless...
>
> >
> > (I'm still trying to figure out how body and html attributes should
> > relate to @page attributes...)
>
> ... if we allow a 'background' property inside '@page', it presumably
> causes a background to be rendered behind the background of the <html>
> element, if any.
>
>
>
> Bert
> --
> 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
>
-- Atsushi Nakamura Senior Engineer Inkjet Device Firmware Design 31 Canon, Inc. 3-451 Tsukagoshi Saiwai-Ku Kawasaki JAPAN 212-8530Tel : 81-44-542-2111 ext3713 81-44-548-7538 direct(shared)
E-mail : nakamura.atsushi318@canon.co.jp --
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