23097 – Why does WebKit run into JavaScript1.7 blocks without supporting any feature of JavaScript 1.7

RESOLVED DUPLICATE of bug 257080 23097

Why does WebKit run into JavaScript1.7 blocks without supporting any feature of JavaScript 1.7

https://bugs.webkit.org/show_bug.cgi?id=23097

Summary Why does WebKit run into JavaScript1.7 blocks without supporting any feature ...

Georg Maaß

Reported 2009-01-04 06:18:06 PST

Why does WebKit run into JavaScript1.7 blocks without supporting any feature of JavaScript 1.7. From the results of my tests, I confirm Safari 3.2 supporting JavaScript 1.6, but testing those language features that make the difference between 1.6 and 1.7 WebKit 528+ fails in each test case. It neither supports block scope variables using the new keyword let nor does it support generators using the new keyword yield nor does it support de structuring assignments. Without implementing these language features, it should not run into javascripts with language="javascript1.7" or type="application/javascript;version=1.7" because those scripts usually make use of exactly those language features not yet implemented in WebKit.

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Julien Chaffraix

Comment 1 2012-05-29 11:44:20 PDT

CC'ing some (I hope relevant) people.

Adam Barth

Comment 2 2012-05-29 16:32:06 PDT

This area is a bit of a mess. My understanding is that TC39 has abandoned out-of-band versioning for JavaScript. We execute whatever types the HTML5 spec tells us to execute.

Alexey Proskuryakov

Comment 3 2012-05-30 14:51:40 PDT