Updated: Opera Releases New 12.00 Pre Alpha Build

By | September 14, 2011 | 20 Comments


Opera Releases New 12.00 Pre Alpha BuildBeats Internet Explorer 10 Platform Preview 2 in the Test262 test suite, fails against PP3.

Continuing the development of Opera 12, Norwegian browser maker has recently released a new build which features a full ECMAScript (JavaScript) 5.1 support and few other goodies.

According to Wikipedia, Opera 12.00 pre-alpha (build 1065) fails only at 5 out of 10978 tests which is slightly better than IE10 PP2 as it scored 7/10935.

As for other web browsers, Firefox 9.0a1 failed scored 168/10978 tests while Google Chrome 15.0.874.12 failed at 413 out of 10978 tests.

In case you are using Windows 8 Developer Preview with IE10 Platform Preview 3, feel free to run this test and let us know the results.

For a complete list of changes and download links, visit the following page.

Update: Internet Explorer 10 Platform Preview 3 beats Opera with only 3 failures.

[Thanks, IE & Opera FanBoy]


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Vygantas is a former web designer whose projects are used by companies such as AMD, NVIDIA and departed Westood Studios. Being passionate about software, Vygantas began his journalism career back in 2007 when he founded FavBrowser.com. Having said that, he is also an adrenaline junkie who enjoys good books, fitness activities and Forex trading.

  • http://twitter.com/bricky149 Shane Bundy

    Only getting 1 fail on the test. Wikipedia can be wrong (like the time Chrome got 97 instead of the actual 100 score it got on Acid3).

    Speaking of Windows 8 WP reckons it’s based on the Linux kernel. Any proof?

    • Everybody

      Opera had 1 fail at the time of release of the snapshot but test262 has been updated few hours later and now it’s 5. However, all five tests are apparently invalid.

      • http://twitter.com/bricky149 Shane Bundy

        Invalid because Opera says so?

        • Everybody

          “Invalid because Opera says so?”

          No, Opera said that only about the one test that already is confirmed to be invalid (https://bugs.ecmascript.org/show_bug.cgi?id=179). They didn’t say anything about other four, but they seem to be invalid since they’re based on assumption that isn’t clarified anywhere in the spec (all test pretty much the same thing).

          • Anonymous

            Who wants to bet Microsoft submitted those tests, and they pass in IE9?  Seems Test262 is just a Microsoft marketing tool.

          • Mikah

            No its not I know Google’s Sputnik test was added to it & Mozilla have been part of it from the beginning 1997.
            I would agree Microsoft use everything as a marketing tool & are very good at cherry picking the bits that suit them

      • http://twitter.com/bricky149 Shane Bundy

        Just tested Opera again and got 5 fails this time. Thanks for validating that for me. :)

  • IE & Opera FanBoy

    IE 10 PP3 has only 3 failures!!

    • http://www.favbrowser.com Vygantas Lipskas

      Thank you!

    • Anonymous

      Could you list those 3 failures, IE & Opera FanBoy?

    • Anonymous

      Could you list those 3 failures, IE & Opera FanBoy?

  • Mikah

    1 fail or 5 fails even a couple of hundred fails don’t mean too much but Opera’s previous score 3865 failures was very poor , quite a turnaround

    • Anonymous

      Probably because Opera didn’t support most of the ES5.1 stuff at all. It wasn’t so much a failure of the code than just the non-existence of it. 

    • Anonymous

      It was more of your failure to understand Opera’s spec and the purpose of the test.

      • Mikah

        Possibly perhaps Nobody will post & explain it all to us & where Opera has gone wrong.

        • Kdsneg9

          opera has been wrong from the very start

          • Mikah

            Thanks for the info perhaps you could be more specific & explain what they did wrong at the very start in 1994 -1995 ?

        • Kdsneg9

          opera has been wrong from the very start

  • Anonymous

    This is great news. Opera 12 is looking more promising with every new pre-release build!

  • FreddyH

    IE10 PP3 fail:
    S15.2.4.4_A14  Checking Object.prototype.valueOf invoked by the ‘call’ property.
    10.4.3-1-8-s      Strict Mode – checking ‘this’ (FunctionDeclaration includes strict directive prologue)
    10.4.3-1-8-gs    Strict – checking ‘this’ from a global scope (FunctionDeclaration incluedes strict directive prologue)