Typed block syntax

#1

Hi @jeremyruston,

This should not work with text/css, am I correct? For example (taken from a snippet by @telumire)

<div class="mydiv" style="--size:100px;">A div</div>

$$$text/css
\rules except dash
.mydiv{
width:var(--size);
background:red;
aspect-ratio:2/1;
}
$$$

Ref: @telumire snippet

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#2

That’s correct, it only works with wikitext examples. For HTML examples like that you’d perhaps be best off with an iframe fed from the contents of a tiddler?

#3

Your example can not work even if the typed block would work. … The style definition as a DIV parameter is only valid inside the DIV block.

The class definition in the typed block doesn’t see the CSS variable.

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#4

I used a wikitext context in my snippet thought :

$$$text/vnd.tiddlywiki
\rules except dash list
<style>..</style>
$$$

-- and : are used for css variables and for pseudo selector so it’s usefull to be able to use the rules pragma to disable the wikitext parsing in arbitrary places in a tiddler (you might want to use dash and list elsewhere in the tiddler). If you use the text/css context, the code is rendered inside a code element which disable the style inside the typed block.

It does work in a wikitext typed block, but the style tag is needed :

https://demos.tiddlyhost.com/#Typed%20block%20and%20CSS%20variables

Unless I misunderstood your comment ?

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#5

hmmm. That’s tricky stuff. On the one hand it’s sophisticated. On the other hand it’s ugly, because of its complexity.

IMO – The things going on with this type of code is too brittle, because the intuition is, that there is a “style” scope. BUT in reality the STYLE tag inside the typed block leaks.

<div class="myClass">
For the  "naive user" the text ''outside'' <br>
the typed-block should NOT have an outline -- BUT it has
</div>

$$$text/vnd.tiddlywiki
\rules except dash list
<style>
.myClass {
  --test: 1px solid blue;
  outline: var(--test);
}
</style>
<div class="myClass">
some text inside the typed-block should have an outline
</div>
$$$

image
image1399×433 14.5 KB

IMO <style> should never be used in production. except your name is Eric Shulmann

I think using proper $:/tags/Stylesheet tiddlers and proper class-names is the way to go.

#6

I think I get what you mean. So the typed block is supposed to act like a sandbox / iframe ? It would be useful for scoping style but again, I found that it is useful to be able to have “leaking” styles, for single tiddler solution, showcasing a demo or doing a quick test.

But yes it’s better to use a dedicated stylesheet tiddler whenever possible.

For those interested, I created an easy way to scope css using wikitext, maybe this can be useful for showcasing CSS snippets for the doc?

https://learning-css.tiddlyhost.com/#:playground%20[[playground%20sandboxed]]

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#7

I intentionally changed $$$text/vnd.tiddlywiki to ask Jeremy if the $$$text/css works or not?
So, your code works and it is correct!

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#8

That’s what users may think it is. BUT it is not … It starts a new parser instance. So it’s possible to have a \rules pragma in the middle of wikitext.

But it renders all the stuff into a DIV … That’s it. No sandbox. No iframe

#9

text/css has no idea about the \rules pragma. So only text/vnd.tiddlywiki can handle wikitext

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