- From: Boris Zbarsky <bzbarsky@MIT.EDU>
- Date: Mon, 03 Sep 2012 20:47:31 -0400
- To: Garrett Smith <dhtmlkitchen@gmail.com>
- CC: www-style@w3.org
On 9/3/12 8:34 PM, Garrett Smith wrote: > What happens when the little 'compatibility view' icon, conveniently > located next to the 'reload' button, is clicked? What does IE8 do? I don't know, but how common are web pages that work in IE8 but not in any other browser? >> It's a definition of what "delete el.style.var.foo" does (though it can >> also affect other things, like attempts to use Array.prototype.shift on >> the object in some cases). You can see the spec at >> http://dev.w3.org/2006/webapi/WebIDL/#delete > > At a glance, it looks like it results in a boolean value That's because the caller in the ES spec (which I pointed you to) expects a boolean return value. Note that the return value of [[Delete]] is not the same thing as the return value of the delete operator. >> I'm not sure why you're so incredulous about "attempt to redefine the >> delete operator", by the way, given that Harmony proxies have a delete >> trap that's designed to allow proxy implementors to do precisely that. >> > Redefining the result of the `delete` operator, as it has been for the > last 13+ years, in CSSOM vars No, it's "redefined" in ECMAScript. Or more precisely, ECMAScript provides extension points for redefining it as needed. See ECMA-357 sections 9.1.1.3 and 9.2.1.3 for other specifications making use of these extension points. Also note that even in ES-262 the delete operator does different things on different objects. For example, see the custom [[Delete]] that arguments objects have in ECMA-262 section 10.6 (sorry, no subsection number for the relevant part of the spec because it's all flat in 10.6; you'll just have to search for "[[Delete]] internal method of an arguments object". So I think your claim about "as it has been for the last 13+ years" is just wrong: the delete operator has done different things on different kinds of objects for a while already. > so that it can result in a string value? I have no idea what you're talking about here. > Nevermind. Willingly, as long as you stop making factually incorrect statements. ;) -Boris
Received on Tuesday, 4 September 2012 00:48:02 UTC