W3C home > Mailing lists > Public > www-style@w3.org > January 2002

RE: Rendering question

From: RUST Randal <RRust@COVANSYS.com>
Date: Tue, 8 Jan 2002 08:54:00 -0500
Message-ID: <37925254B67DD311876C009027B0FF9201D3A5B1@cbscolex01.cbsinc.com>
To: "'Dave J Woolley'" <david.woolley@bts.co.uk>, "Css (E-mail)" <www-style@w3.org>
OK.  That makes sense.  Now one other question:  Does the image get
downloaded by the User Agent, even it it's display is set to none?  I don't
know enough about how the browser actually works to answer this myself.

In my current development, I have discarded tables altogether, except for
the display of tabular data.  I use XHTML for structure and CSS for
positioning and style.

-----Original Message-----
From: Dave J Woolley [mailto:david.woolley@bts.co.uk]
Sent: Tuesday, January 08, 2002 8:48 AM
To: 'RUST Randal'
Subject: RE: Rendering question




> Isn't it correct that the User Agent generates the document tree BEFORE
> rendering the page on the screen?
> 
[DJW:]  There is specific provision in CSS for incremental
rendering, even of tables++, so no, the whole tree is not
generated.  In any case, the image should not be fetched 
(for performance - it will not be rendered##) and the browser
need do nothing with the contents until the display: none
elemnet is closed.

Also, NS4, in particular, tends to parse in tag soup mode
(a problem for CSS), acting tag by tag, rather than recognizing
elements.

++ Most commercial sites fail to use this and therefore do
not display incrementally, even on browsers, like IE 5+, that
support it, because most commercial pages violate a "should
not" in the HTML specification and use tables for layout.

## A mass market GUI browser might chose to fetch the image
because it expects a document object model manipulation to
remove the display: none.

(Incidentally, real text only is used by quite a lot of people
who want fast and clean access to the web; pages that don't
render well text only generally are lacking in real content,
although may need to be accessed as the cheapest way of
using a service/buying something.

A large proportion of IE security bugs are dependent on JavaScript
and some organisations filter it at their boundary, and various
people (including, I believe, the German government, advise 
disabling support for it.)
-- 
David Woolley
BTS Holdings Limited

Tel: +44 (0)20 8401 9000	Fax: +44 (0)20 8401 9100
http://www.bts.co.uk	      http://www.bureauexpress.com



---------------------------DISCLAIMER---------------------------
This e-mail is confidential and intended solely for the use of the 
individual to whom it is addressed. Any views or opinions presented 
are solely those of the author and do not necessarily represent those 
of the company. If you are not the intended recipient, be advised that 
you have received this e-mail in error and that any use, dissemination, 
forwarding, printing or copying of this e-mail is strictly prohibited.
If you have received this e-mail in error please contact the sender.
Received on Tuesday, 8 January 2002 08:52:39 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Monday, 27 April 2009 13:54:12 GMT