Mark S. Miller wrote:
On Thu, Dec 13, 2012 at 7:05 PM, Brendan Eich<bren...@secure.meer.net> wrote:
Boris Zbarsky pointed out on public-script-coord that window.location and
window.document must be non-configurable _ab initio_, but perhaps this is
achievable with direct proxies?
This resolved into two suggestions, both consistent with ES5 and with
direct proxies:
* windows.document and window.location must refuse to be configured,
but they can still claim to be configurable. ES5 purposely forbids
only the opposite mismatch: They can't claim to be non-configurable
but still change state in ways that violate that claim.
* Allen suggested that these could be non-configurable getter-only
accessor properties,
window.location can be set by assignment to navigate to a new URL. Yet
it appears in Chrome, Firefox, Opera, and Safari to be a writable data
property. In any event, it can't be a getter-only accessor.
/be
where the getter stays the same and the magic
"switching" behavior is in the getter. (My words for Allen's
suggestion)
Either is fine. I like Allen's better.
--
Cheers,
--MarkM
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