Object.defineProperty not supported in Opera (and IE9 when it goes into "quirks mode")

[efortuna]

Opera does not support Object.defineProperty, which we use in basically every compilation of Dart->JS code generated through Frog.

IE 9 also has this problem, unless you turn quirks mode off (which it seems to like to default to with our JavaScript).

They throw an error to the effect of "object does not support "Object.defineProperty" function.

Some initial web searches suggest defining defineGetter and defineSetter are a workaround to defineProperty.

[DartBot]

This comment was originally written by lr...@chromium.org

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The current Dart to JavaScript compiler targets only ES5 capable browsers.

Using non-standard tricks like defineGetter won't always be able to emulate the ES5 features (e.g., defineGetter or proto doesn't work in any version of IE).

Whether IE is in compatability mode or not depends on the HTML DOCTYPE element, so it's not something that can be controlled by the script.

[DartBot]

This comment was originally written by drfibonacci@google.com

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Added Triaged label.

[efortuna]

Opera 12 alpha correctly supports Object.defineProperty. Opera 12 will be our first Opera-supported browser.

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Added WontFix label.