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?

CSS parser can be really simple.

css-file = (WHS* | CDO | CDC | '@' ID [ '{' block '}' ] | selector-block)*
block = (WHS* | '@' ID [ '{' block '}' ] | selector-block)*
selector-block = selector [ ',' WHS* selector ]* '{' decl-list '}'
selector = nodeselect [ sel-comb nodeselect ]*
sel-comb = WHS* ['+' | '>' | '~'] WHS* | WHS+
nodeselect = [ID | '*'] attrsel* | attrsel+
attrsel = '[' WHS* ID WHS* [matchop WHS* [ID|STR] WHS*]? ']'
| '#' NAME
| '.' ID
| ':' ':'? ID
matchop = ['~' | '|' | '^' | '$' | '*' ]? '='
A few hundred bytes should be sufficient to parse this.