ECMAScript Version Support
| Trident | Gecko | WebKit | Presto | Chrome Webkit | |
|---|---|---|---|---|---|
| Name of ECMAScript Engine | JScript/Chakra | Spidermonkey/TraceMonkey | JavaScriptCore/SquirrelFish Extreme | Linear B/Futhark/Carakan | V8 |
| ECMAScript Edition 3 | Yes | 0.6 | Yes | 1.0 | Yes |
| ECMAScript Edition 5 | 5.0 | 2.0 | Partial | Yes | Yes |
| JavaScript 1.5 extensions | No | 0.6 | Yes | 1.0 | Yes |
| JavaScript 1.6 extensions (excluding E4X) |
No | 1.8 | Partial | Partial | Partial |
| JavaScript 1.7 extensions | No | 1.8.1 | No | Partial | No |
| JavaScript 1.8 extensions | No | 1.9 | Partial | No | Partial |
| JavaScript 1.8.1 extensions | No | 1.9.1 | No | No | No |
| JScript .NET extensions | No | No | No | No | No |
| ActionScript extensions | No | No | No | No | No |
| E4X | No | Dropped | No | No | No |
Read more about this topic: Comparison Of Layout Engines (ECMAScript)
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