I'm not saying it does; I'm just saying this concept has emerged naturally in a teaching discourse about XUL.
It's emerged in the same way that it would in a discussion of <frameset> in HTML.
In fact HTML <framesets> simply use a XUL <splitter> to visually separate the HTML <frame>s.
If it's not imported from HTML or confused with XUL's <iframe>, then it must be a worthy observation about implementation.
It's imported from HTML, by analogy with <frameset>. It has nothing to do with the implementation (as a matter of fact, the two things on the sides of the splitter in XUL are boxes, not frames, and the splitter itself is a frame as well as a box -- that's the implementation).
I understood from the tree-like internals of layout that frames can be indicated by leaf or by subtree internal nodes of that structure. Does that mean that "frame-like" layout items do not need to be atomic? My point.
I'm not sure what this paragraph is saying, so I'm not sure how to respond to it....
Ok, bad example. CSS's list-style-image or :first-letter concepts are better examples.
"A css box" for those. Which may happen to be a frame in Mozilla. Or it may happen to be a box.
-Boris
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