What do you suppsoe that dilo uses? Also GTK and nearly everything uses lesstif (or motif) at least for WM HINTS support.
I use dillo myself -as a help browser. It won't render much more than *very* basic HTML, which is great, if only every one would write webpages without forms and tables.
BTW, since Chico uses the shared libraries from Mozilla it produces a 50K binary before stripping.
And who doesn't have GTK-1.2 on board? Only the tiniest distros.
I've built up quite a collection of GUI components and user-oriented programs which need only GTK-1.2 to run. You can check them out here:
I build a very functional GUI desktop with 20-30 GUI accessories using less than 240MB. Remember, I said small, not tiny.