Hi <:-),

> Where/how can I find out in what z-index position various elements are?

Maybe something like this:
https://developer.mozilla.org/en-US/docs/Tools/3D_View

You need to enable "3D view" in "Available toolbox buttons"

See
http://superuser.com/questions/774846/does-firefox-30-still-have-the-3d-dom-viewer

> What is it that decides that e.g the tiddler title is seen in front of
> the tiddler background etc?
> Or is the order set in some other way perhaps?

When the title div is contained in the tiddler frame element then it
automatically has a higher stacking order and is raised above its
parent. So that is why only a few elements have a z-index set (e.g. the
modal), since otherwise the order is defined by nesting.

https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Understanding_z_index/The_stacking_context
http://www.silexlabs.org/haxe/cocktail/cocktail-technical-articles/the-layer-and-stacking-context-trees/
http://www.vanseodesign.com/css/css-stack-z-index/

-Felix

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