Why browsers are bloated

https://github.com/WebKit/webkit/blob/master/Source/WebCore/platform/Scrollbar.cpp
https://github.com/WebKit/webkit/blob/master/Source/WebCore/platform/win/ScrollbarThemeWin.cpp
Let's reinvent the fucking scrollbar, which every goddamn platform with a UI already has, and make it behave subtly different from the native one!

Right-click a native scrollbar in some other app:
- Scroll Here
- Top
- Bottom
- Page Up
- Page Down
- Scroll Up
- Scroll Down

Right-click a scrollbar in Chrome:
- Back
- Forward
- Reload
- Save As...
...

Right-click a scrollbar in Firefox and Opera:
Absolutely fucking nothing happens!

What the fuck!? How did these terminally retarded idiots get involved in creating one of the most important pieces of software to the average user?

HTML5 tokeniser + parser + DOM allocation + nice treeview GUI (looks like FF's DOM Inspector) in under 32KB! Only tokeniser is in Asm, rest is in unoptimised stupidly simple C.

Add CSS parser, box renderer, full network support, and it's still probably going to be under 256KB. Assuming the target is 1MB that still leaves 768KB for a JS interpreter, w00t w00t!!