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I believe you are well on your way to the next programming language, scripting language, standard.
Here is your guidance...
xkcd: Standards[^]
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The reason stuff like that isn't possible is because you will get endless recursion.
Let's say you have:
<div class="b">
<div class="a">
</div>
</div>
The height of B is determined by the content of A, but if you are changing the width of A based on the height of B then the height of A will also change, which in turn forces the height of B to change, which would then require the width of A to change, which will once again change the height of B, and the loop continues until you get a StackOverflow exception.
So perhaps you say: "Well, don't allow rules like that", but then you end up with even more of a headache trying to make sure your rules don't conflict with other rules.
Put it this way, if it was possible to make it work well then it would for sure already exist.
As the saying goes: if you have a good idea, it either already exists or it really isn't that good an idea.
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musefan wrote: As the saying goes: if you have a good idea, it either already exists or it really isn't that good an idea.
Luckily everyone doesn't think like that, otherwise all development would stagnate.
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A proper upvote for that!
| Ravings en masse^ |
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| "The difference between genius and stupidity is that genius has its limits." - Albert Einstein | | "If you are searching for perfection in others, then you seek disappointment. If you seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010 |
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Jörgen Andersson wrote: Luckily everyone doesn't think like that
Indeed, most people don't even think at all...
But I don't particularly agree that we only advance from unique ideas. I am sure a lot of people come up with the same ideas all the time, it's just who gets to market first, so to speak.
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musefan wrote: who gets to market first
Word.
Edison comes to mind.
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What you describe already happens in the layout engine of modern browsers. The rules that I outlined earlier already happen, but is invisible to us. There are hundreds of such rules that must be evaluated to produce the final layout, and some are in direct conflict with each other, so the engine is designed to make a compromise. These compromise heuristics is what avoids endless recursion.
So imagine that tomorrow the Google Chrome team launches a new module called JSCSS, were they have moved out all those heuristics from inside the layout engine and written them in JS. From now on you point to a JSCSS file at the beginning of a HTML page, which defines all the CSS rules you intend to use. CSS still works exactly like before. But the HUGE difference is, now you can see how a flexbox actually figures out layout, AND you can extend CSS with your own definitions for things you think is better than the standard. AND you can omit CSS altogether, and write your layout directly in JSCSS of you want.
This would be a huge relief for everyone, because browser makers only have to make sure the core layout engine works correctly, and every CSS definition is in external JS, exactly the same for every browser. And any developer can extend CSS with his own definitions.
Bjorn
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That feature doesn't exist, because IMO it's something that we shouldn't do to begin with. Websites are displayed on various screen sizes, contrary to Windows App which almost definitely shown on a monitor.
If you fixed the size of element b as 1/10 of total web page's height, it will be nightmare/unreadable on some screen sizes.
If it's screen size, there already "vh" and "vw" as unit size.
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Whilst I don't disagree with you re:CSS, in that example you've given it could be easily achieved using JS / jQuery.
It's simply a case of picking the right language for the job.
Of course as others have picked up on, doing that might cause all sorts of strange behavior once you start looking at the various sizes of screens your page may show up on, from 1 inch watches to 100 inch projectors. You just can not be sure of the scale your user will be using.
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Agreed, it's a PITA and those that have mastered it are deep into the dark arts.
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bjoernen wrote: by writing simple math formulas into the CSS
Like this[^], you mean? The calc() functions in CSS are useful, potentially (though I've not used them myself) but they don't directly include the ability to refer to other elements. However you can refer to CSS custom variables which may give you the flexibility you want. But hey, all this is just adding more bloat, and making it harder to learn (and test for cross-browser compliance). The trouble is, the features you want are not the same as the features someone else wants - and pleasing everyone is what leads to bloat in the first place. 
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It's a language by committee. And a committee made up of teams that are actively competing with each other. Read this discussion on CSS4[^]. They actually, deliberately, don't want to increment the CSS version anymore. That's like macOS stopping at version 10 (...but instead is 10.1, 10.2 etc), and Windows 10 stopping at 10. Or 10 20H1, 20H2...)
I think the hardest part of CSS is the "C" - the cascading, which relies on Specificity. It's super logical and very well defined. And an utter nightmare as soon as you step off the beaten track. Switch elements around, decide you need some special formatting, try and generalise it, and boom!
Still - it does at least attempt to encourage a separation of layout and style. Except the CSS defines the layout 
cheers
Chris Maunder
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Chris Maunder wrote: that's like macOS stopping at version 10 (...but instead is 10.1, 10.2 etc), and Windows 10 stopping at 10. Or 10 20H1, 20H2...)
. . . . perchance to dream . . . .
| Ravings en masse^ |
|---|
| "The difference between genius and stupidity is that genius has its limits." - Albert Einstein | | "If you are searching for perfection in others, then you seek disappointment. If you seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010 |
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Yea I wish CSS was only about style, and layout was handled in a different way. I think it is possible to keep the core layout engine of the current browsers, and create a kind of scripting language they can run, so the developer can interact with the layout procedure. These ideas have been proposed before, so I can't understand why we still have CSS today. I was cursing HTML layout 15 years ago, and couldn't imagine we would still be doing things the same way today.
Some developments in this space have been amazing, but HTML/CSS/JS has really been a disappointment. There is still not a practical way to write C# and run it in the browser, just promises of WASM and compilers that never hit mainstream.
Bjorn
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bjoernen wrote: compilers that never hit mainstream
You've not looked at Blazor[^]?
cheers
Chris Maunder
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The fascination of presentation over content.
It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food
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"The medium is the message"
"Time flies like an arrow. Fruit flies like a banana."
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I'm a simple man. I see CSS hate, I upvote.
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I actually gave that on a mug to a designer, it's his favorite mug 
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CSS is not a language, it is markup.
Bastard Programmer from Hell 
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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They have started to add programmatic elements to it and it won't be long before there will be a full blown css scripting language based on COBOL - because for reasons that are unclear to me the entire community is committed to making things as complex/multi-layered/obtuse as possible.
Whatever you do on a webpage you must never just put an input element on the form - it must have a template that references other templates and style sheets that must be run through SASS and dozens of other utilities/mods/nightmares - all to collect a first and last name from a customer.
I swear to Judas that some developers go into a project seeking to add as much complexity as possible.
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separation of content and style, that's what they say when they teach little kids about css
the next logical step it was
i never new what hit me, that was around 98. i discovered it was css when every page broke on every browser. it was said that browsers were guilty of not heaving decent support for it. for me it was the other way around, so i never looked at css
whenever i see it embedded in html i just skip that part
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That's why we have LESS and SASS, both able to do what you and I want.
Personally, I still prefer using tables for layout, because it doesn't move elements around in odd places, as floating divs often do, but I am trying to get used to it, because it can make it easier to have one page for all sizes of screens.
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