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Re: Wrapping delimited lists, fluid rows

From: Andrew Fedoniouk <news@terrainformatica.com>
Date: Fri, 23 Feb 2007 10:37:19 -0800
Message-ID: <001c01c7578c$8ccd4810$db02000a@internal.toppro.net>
To: "Daniel Beardsmore" <public@telcontar.net>, <www-style@w3.org>


----- Original Message ----- 
From: "Daniel Beardsmore" <public@telcontar.net>
To: <www-style@w3.org>
Sent: Thursday, February 22, 2007 8:15 PM
Subject: Wrapping delimited lists, fluid rows


|
| I won't dump my entire backlog of ideas here in one go, but here's something
| that's troubled me without solution: imagine a list with a visual delimeter 
set
| to display horizontally:
|
|   ul.menu li { display: inline }
|   ul.menu li:after { content: " |  " }
|   ul.menu li:last-child:after { content: none }
|
| A given list might look like:
|
|   Foo | Bar | Baz
|
| But if this list wraps onto a new line, you'll see a problem:
|
|   Foo | Bar | Baz | Iddly | Diddly | We've | Run | Out |
|            of | Names | For | This | List
|
| The last item on the first row doesn't get its delimited removed.
|
| I was thinking, can't we have a way to select :last-on-line and 
:first-on-line?
|
| So then we can stipulate:
|
|   ul.menu li:last-on-line:after { content: none }
|

....

Rules like

ul.menu li:after { content: " |  " }
ul.menu li:last-on-line:after { content: none }

effectively create oscillation condition in the layout algorithm.

Think about the case whem space left on the line is less than
width of " |  ". In this case last item needs to be wrapped on
the next line. So you will have a situation when
"ul.menu:not(:last-on-line) li"  and ul.menu "li:last-on-line" matches
the same element in single layout transaction.

Highly undesirable behavior.

Main principle of stable system of selectors and layouts:

It shall not be any selector A that when it is
applied to the DOM produces layout that is
making selector :not(A) true for the same DOM
element.

Andrew Fedoniouk.
http://terrainformatica.com
Received on Friday, 23 February 2007 20:51:55 GMT

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