Konqueror uses a very capable HTML rendering engine called KHTML. This engine is implemented as a KPart and as such, it can be easily used by other KDE programs. KHTML is also used by the Apple browser Safari.

Features of the HTML rendering component in KDE 3.4:

1. HTML 4.01 compliance.
2. ECMAscript 262 support (JavaScript).
3. Ability to house Java applets.
4. Cascading Style Sheets(CSS):
5. SSL support (requires OpenSSL).

Konqueror Home Page