On Jul 13, 2009, at 3:40 PM, Adam Barth wrote:
On Mon, Jul 13, 2009 at 3:29 PM, Geoffrey Garen<gga...@apple.com>
wrote:
Our current behavior is buggy, unpredictable, and out of spec. This
has led to security bugs in the past and will lead to security
bugs in
the future.
I don't disagree with you, but I'm not immediately convinced that a
large
design change will automatically reduce the bug count, either.
Which spec did you have in mind? I'd like to read it.
Essentially, the ECMAScript spec requires this. In spec-land, these
objects are all created at the beginning of time. The fact that we
create them lazily is what leads to this bug. Depending on who
touches them first, they end up with different prototype chains, which
doesn't make sense to ECMAScript.
While the behavior you describe seems problematic, I don't think it is
an ECMAScript violation, since ECMAScript essentially allows host
objects to do anything. If this is defined by spec, the specs that are
relevant would be HTML5 and Web IDL. I'm not sure if those clearly
define the behavior.
- Maciej
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