[future specs] `content: element(something, all)

[julientaq]

Since we’re creating a new value for element in #2, i was wondering how all could be used without once

• all: generate an element with all the elements with the position property with the right value for the variable.

• once: only draw the element once and then forget about it.

This would let an author reuse a whole set of content for all the book. So, for instance, we could have book tabs using the following code:

h2 {
     string-set: sideTitles contents;
}

@page {
    @right-center {
        content: element(sideTitles, all);
    }
}

This would also allow for all (without once) that would repeat all the elements on all the pages (or all the named paged). A good use case for that would be printed tabs for scholar books or dictionary without any custom specifc or complex elements.

note String-set only keeps the content of an element and retains no tags of it (no italic, bold, etc. — at least in paged.js) We may want to change that at some point to get the innerHTML instead of the textContent.

note i used string-set by oviously running would be better, or some other way to clone a content.

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we could do the same with once, to use the value of an element only once, but i haven’t found a use case for that yet outside of experimental graphic design experiment / practice.