25001 2014-03-11 03:08:22 +0000 Attr.specified 2014-03-18 07:48:01 +0000 1 1 1 Unclassified WebAppsWG DOM unspecified PC All VERIFIED FIXED P2 normal --- 1 philipj annevk eric ian mike www-dom public-webapps-bugzilla oldest_to_newest 102181 0 philipj 2014-03-11 03:08:22 +0000 http://software.hixie.ch/utilities/js/live-dom-viewer/?saved=2879 This is supported and returns true in every browser I've tested. It's used by jQuery, and is encountered on ~7% of pages by Chrome's use counter system: http://www.chromestatus.com/metrics/feature/timeline/popularity/162 102185 1 eric 2014-03-11 04:28:36 +0000 Careful, it's "page loads" not "pages". 7% of page loads from Chrome installs with anonymous statistics reporting enabled. That's a ton of page loads. :) We can get "pages" numbers as well by crawling the web, but that's a different question. Regardless, it seems silly for this property to be marked as deprecated when it's seen on 7% of chrome page loads. 102192 2 philipj 2014-03-11 07:00:28 +0000 Thanks Eric, I'll make sure to be more precise when talking about use counters outside of blink-dev :) 102232 3 ian 2014-03-12 05:29:13 +0000 The test in comment 0 tests something different than the bug subject line refers to. Can you elaborate on what this bug is about? 102235 4 philipj 2014-03-12 06:58:15 +0000 Oops, this is the correct test: http://software.hixie.ch/utilities/js/live-dom-viewer/?saved=2880 In other words, it looks like all browsers I've tested have a specified attribute on Attr objects. In Blink it's always true, but I haven't checked how it's implemented elsewhere. As an experiment, I dropped it from Blink and ran the jQuery tests, which caused 20 failures in LayoutTests/jquery/attributes.html. The fact that it's used by jQuery probably accounts for a lot of that 7%. I don't know for certain that specifying it is the best course of action, but it seems like the easiest fix. 102453 5 annevk 2014-03-17 15:18:42 +0000 https://github.com/whatwg/dom/commit/ab7d0c17491d94a93a463f04f6977ce689e9da0b 102533 6 philipj 2014-03-18 07:48:01 +0000 Thanks!