Bimlas,
I really like CSS variables and they give a lot of flexibility 
see 
https://blog.logrocket.com/how-to-create-better-themes-with-css-variables-5a3744105c74/
See default values, scope, overwriting, ...
But I have no experience to see what are the pros and cons of using CSS 
variables in Tiddlywiki. 
Just experimenting today I realized for example:

   1. CSS variables only works in a CSS tiddler (e.g you have to set 
   tiddler type to text/css)
   2. CSS variables can be used in a mixed way with transclusion 


@PMario,
I think IE will be retired soon, as Microsoft has dropped its support in 
2021, but it is believed some corporates computers may use IE for extended 
times and I think Tiddlywiki may drop supports several years later :-)



On Tuesday, December 8, 2020 at 12:14:05 PM UTC+3:30 bimlas wrote:

> The question arose in me, "Why use CSS variables if TiddlyWiki can handle 
> them too?". Thinking through the question, the answer is pretty clear: it 
> improves a lot in terms of performance if the TiddlyWiki variables are only 
> used when assigning a value to a CSS variable, and using CSS variables 
> everywhere else. This way we don’t have to run macros and filters 
> unnecessarily.
>
> Good idea!
>
> Mohammad a következőt írta (2020. december 8., kedd, 8:58:41 UTC+1):
>
>> CSS  tiddlers are an important part of Tiddlywiki to adjust look and feel 
>> of different elements. For some use cases (like plugins, webpages, blogs) 
>> you may need to set properties of many elements.
>>
>> What is your best practice for such cases:
>>
>> 1. Using *css variables* like 
>> https://www.w3schools.com/css/css3_variables.asp
>> 2. Using a Tiddlywiki *dictionary tiddler* and a few 
>> *macros/transclusion*
>>
>> Note that this way one have some small parameter to set them manually and 
>> a large number of properties will be set dynamically, so the 
>> maintainability, hackability, scalability, ... all will be improved.
>>
>> --Mohammad
>>
>

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