I was curious to check how well the current browsers implement ECMAScript 262 specification. At the time of writing I have the following browsers installed on my machine:
- Google Chrome (34.0.1847.116 m)
- Microsoft IE (11.0.9600.17031 / 11.0.7)
- Mozilla Firefox (28.0)
I guess Chrome, IE and Firefox present at least 90% of all desktop browsers. I tested them against the test suite provided by ECMA (http://test262.ecmascript.org) and it turned out none of them passed all the tests. Here is the list of failing tests for each browser.