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Re: [CSS3] Proposal to add list-style-type: tree-line value

From: James Elmore <James.Elmore@cox.net>
Date: Wed, 20 Feb 2008 15:36:27 -0800
Message-Id: <CA619665-4A10-4BFB-BC69-C955D2D6DEC3@cox.net>
Cc: www-style <www-style@w3.org>
To: Daniel Glazman <daniel.glazman@disruptive-innovations.com>

On Feb 20, 2008, at 1:29 PM, Daniel Glazman wrote:

> Andrew Fedoniouk wrote:
>> I think it makes sense to add another value to the list-style-type  
>> enumeration - "tree-line".
> Wow, that's far more than stylistic Andrew... That's clearly
> behavioural. But that is only a part of the solution needed for
> UL/LI turned into foldable trees. We need a queryable way to  
> specify an
> item is folded or not too... Right ?
> </Daniel>


Clearly the behavioral part would be useful. Given the choice, I  
would like to see it added to CSS. To make it most useful, designers  
would need to be able to query the current state of the list, the  
current state of a single element in the list (visible or not), and  
to 'fold' and 'unfold' the list to hide/display an element or sub- 
tree (fold/unfold one level, or some number of levels, or all  
levels). This would be most useful when connected with pseudo- 
elements :hover, :active, and :focus, so the designer could make the  
list expand/collapse based on user actions.

And, before the programmers reply with 'Do it in JavaScript', I know  
it can be done with a procedural language. I have done it that way.  
But, if we are talking about styles, visible and hidden are styles  
already, this would just allow better control of the PRESENTATION by  
the stylist.

If not given the choice, the list-style-type of 'tree-line' would  
still be useful. Although, the proposed name did not convey the  
utility of the suggestion. Reading 'tree-line' I thought of the tops  
of the trees, somewhat like a skyline in a city. Are there other  
suggestions for naming this useful list-style-type? (The only thing  
that comes to mind right now is 'tree-list'.)

James Elmore
Received on Wednesday, 20 February 2008 23:36:44 UTC

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