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ECMAScript 5.1 support for Opera (snapshot build)

September 13, 2011 · by Mike Taylor

The Desktop Team has released an exciting update to Presto (Opera's rendering engine) and Carakan (Opera's JavaScript engine). Most notably, this snapshot includes full support for ECMAScript 5.1, the latest official version of the ECMAScript specification. In addition to adding all of the new built-ins and strict mode, we've fixed lots of minor spec compliance glitches and other bugs.

To get a sense for why this is so exciting for both developers and end-users, just check out the difference in results for test262 (the official test suite) between Opera 11.51 and today's 12.00 pre-alpha snapshot:

Opera Next snapshot: Pass: 10926 | Fail: 1| Failed To Load: 0
Opera 11.51 Final: Pass: 7062| Fail: 3865 | Failed To Load: 66

And the one test this snapshot fails is likely invalid.

If ES5 isn't your thing, we've still been working hard on completing our support for HTML5 as well. In this snapshot the tireless Philip Jägenstedt has landed the @muted (CORE-40275) and @preload (CORE-19293) attributes for HTML5 <video>.

Finally, a fun CSS bug was fixed (CORE-28884) allowing box-shadows for <input> elements to finally work as you would expect.

Go grab the snapshot while it's still hot and be sure to check out the full changelog!

Readers' comments 15

Left under the original article, as archived.

Martin KadlecTuesday, September 13, 2011 3:18:06 PM
Thank you so much!

Article about typed arrays on dev.opera.com would be nice (with some performance comparison).
Unregistered userTuesday, September 13, 2011 3:28:22 PM
Davit Barbakadze writes: Any update in XMLHttpRequest Level 2 direction?
LennieTuesday, September 13, 2011 4:09:22 PM
While I'm really glad I would like browser makers to keep an eye on what others have already implemented, like the Anonymous comment above. This is what is pretty high on my list: http://caniuse.com/#search=cors
Charles SchlossTuesday, September 13, 2011 4:31:23 PM
Excited for what comes Next
Divya ManianTuesday, September 13, 2011 4:44:54 PM
Lennie, we are definitely looking to have that in as soon as possible. Work has begun
Unregistered userTuesday, September 13, 2011 5:06:50 PM
David Fugate writes: Glad to hear this
Michael JohnsonTuesday, September 13, 2011 7:15:48 PM
And here I just filed a bug on CORE-28884 last night...
Unregistered userWednesday, September 14, 2011 7:19:33 AM
Davit Barbakadze writes: Divya Manian, is there any public roadmap (for XHR 2 specifically at least)?
Constantine VesnaWednesday, September 14, 2011 8:58:43 AM
Thanx!
Originally posted by BS-Harou:

Thank you so much!
Article about typed arrays on dev.opera.com would be nice (with some performance comparison).

You can just try it in JSPerf:
http://jsperf.com/read-write-typed-arrays/2

Seems like in Opera Arrays are already optimized by engine, so unless you specify them to be Float32 - the speed difference is not visible.

Or at JSbench:

http://chart.apis.google.com/chart?cht=bhg&chs=600x145&chd=t:0.096000,0.051000,0.044000,0.045000,1.119000,1.120000&chm=t96us%20(1000+runs),000000,0,0,13,1|t51us%20(1000+runs),000000,0,1,13,1|t44us%20(1000+runs),000000,0,2,13,1|t45us%20(1000+runs),000000,0,3,13,1|t1.119ms%20(1000+runs),000000,0,4,13,1|t1.12ms%20(1000+runs),000000,0,5,13,1&chbh=12,1,5&chco=0095b6&chds=0,1.12&chxt=x,x,y&chxr=0,0,1.12&chxl=1:|ms+per+iteration|2:|float64|float32|int16|uint8|uint32|array&chdl=Current%20runs

Here you can see that using typed integer arrays will you 2x speed up vs normal arrays, and using float arrays will give you 10x slowdown vs normal arrays.

p.s: in Chrome, accessing float32 arrays is twice faster than normal arrays, and integers are 4 times faster.

p.p.s: lol, Opera is faster than Chrome in booting emulated linux ! (time was measured at second run after F5, to ensure caching):

Opera 12.b1065 - 5.1 sec
Opera 11.51 - 7.5 sec
IE9 - 8.5 seconds
Chrome 13 - 8.6 sec
Firefox 9 Nightly - 13 sec
МихаилWednesday, September 14, 2011 12:20:28 PM
After yesterday test262 update:
Tests To Run: 10978 | Total Tests Ran: 10978 | Pass: 10973 | Fail: 5 | Failed To Load: 0
- S11.1.1_A2 Checking if execution of "this" and eval("this"), which are in global code, return the global object by using toString function fail
- S12.5_A9_T3 Declaring function within an "if" statement that is declared within the function declaration fail
- S12.6.1_A13_T3 Declaring a function within a "do-while" loop that is within a function declaration itself fail
- S12.6.2_A13_T3 Checking if declaring a function within a "while" Statement that is in a function body leads to an exception fail
- S12.6.4_A13_T3 Declaring function within a "for-in" Statement that is within function declaration fail
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 -
Divya ManianFriday, September 16, 2011 1:21:32 AM
Originally posted by anonymous:

Davit Barbakadze writes:

Divya Manian, is there any public roadmap (for XHR 2 specifically at least)?

Unfortunately not at this moment I am afraid. But we are looking to have this in the next stable release if we can.
ChrisSaturday, September 17, 2011 4:36:55 PM
Originally posted by mikolka-paravoz:

After yesterday test262 update:
Tests To Run: 10978 | Total Tests Ran: 10978 | Pass: 10973 | Fail: 5 | Failed To Load: 0
The same invalid test that used to fail still fails, and the 4 others are invalid as well.

mikolka-paravoz and test262 FAIL
Cutting SpoonMonday, September 19, 2011 9:02:29 PM
With such an honest face appended, how could he be lying? Besides it was already disclosed that Opera Desktop for 32-bit Linux has a couple failed tests that need to be sorted out so it matches the other distros. I think someone said there may be a few OSX nails to hammer in also.

This is still a very encouraging development. Better internal support for raw binary data/streams will open a path to improve several aspects, not least being 3D context and video tag.
Charles SchlossMonday, September 19, 2011 9:51:50 PM
Originally posted by hellspork:

Besides it was already disclosed that Opera Desktop for 32-bit Linux has a couple failed tests

tho how does the 64 bit for linux do?
Cutting SpoonWednesday, September 21, 2011 10:35:22 PM
Supposedly the 64-bit Linux should be in line with a vanilla Windows install (only the one invalid test fails), and I think the Mac version at least passed on 10.6 and 10.7 (don't know how far back they check).

About this article

Published in	ODIN blog
Date	September 13, 2011
Author	Mike Taylor
Tags	video, css3, es5, HTML5
Original	Internet Archive