Figuring out the behavior of WindowProxy in the face of non-configurable properties

Boris Zbarsky bzbarsky at
Wed Jan 14 18:45:11 PST 2015

On 1/14/15 8:56 PM, Bjoern Hoehrmann wrote:
> What are the odds that the behavior observable by web pages can actually
> be defined sanely such that ES invariants and compatibility requirements
> are satisfied?

My personal best estimate is about 30% chance for the one such 
definition we have so far being web compatible.  But this is mostly 
based on gut feeling.

> indicates, as I understand it, the odds may be quite good. In that case,
> looking for a volunteer to come up with a proposal might be a good next
> step.

We have a proposal.  It's at

I have an implementation that I've been trying to land in Firefox for a 
few weeks.  I had to fix a bunch of our tests, then restrict the change 
to web pages because it breaks various extensions.  I'm pretty hopeful 
that I can at least get it to the point where I can try doing some web 
compat testing... for those who want 
to follow along.


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