| Browser+version | Layout/Renderer | JS Engine |
|---|---|---|
| Firefox 3.0 | Gecko | SpiderMonkey (SM) |
| Firefox 3.5 | Gecko | TraceMonkey (TM) |
| Firefox 3.6 | Gecko | JaegerMonkey (JM) |
| Safari 4.x | WebKit | SquirrelFish Extreme(SF) |
| Google Chrome 5.x | WebKit | V8 (V8) |
| IE 8 | IE[1] | IE[1] |
| Opera 10.1 | Presto | Futhark (O1) |
| Opera 10.5 | Presto | Carakan (O5) |
[1]: No information whatsoever is known on this engine.
| Feature | Relevant test case | F0 | F5 | F6 | SF | V8 | O1 | O5 |
|---|---|---|---|---|---|---|---|---|
| JIT | (in progress) | X | X | X | X | X | X | |
| Polymorphic IC | icSizeTest | X | ||||||
| Monomorphic IC | icSizeTest | ? | X | X | X | X | X | |
| Hidden classes | hiddenClassesTest | X | X | X | X | ? | ? | |
| Tracing | tracerTest | X | X |