136635 2014-09-08 10:29:07 -0700 requestAnimationFrame callback is invoked with a wrong context 2014-09-08 23:45:44 -0700 1 1 1 Unclassified WebKit WebCore JavaScript 528+ (Nightly build) Unspecified Unspecified RESOLVED DUPLICATE 126680 P2 Normal --- 1 andrea.giammarchi webkit-unassigned ap bzbarsky dino ggaren john.david.dalton mathias oldest_to_newest 1033889 0 andrea.giammarchi 2014-09-08 10:29:07 -0700 Steps to reproduce the problem: 1. write the following in a console 2. requestAnimationFrame(function(){'use strict';alert(this)}); 3. see that `window` is alerted instead of `undefined` What is the expected behavior? function should be invoked with undefined context to fullfill both sloppy and strict expectations What went wrong? suddenly, the wild global context appears ... Did this work before? No Chrome version: 39.0.2149.0 Channel: canary OS Version: OS X 10.8.5 Flash Version: Shockwave Flash 15.0 r0 every single Chrome I could test with requestAnimationFrame out of its prefixed version. 1033891 1 mathias 2014-09-08 10:31:40 -0700 See also: https://code.google.com/p/chromium/issues/detail?id=411959 1033894 2 bzbarsky 2014-09-08 10:40:36 -0700 >3. see that `window` is alerted instead of `undefined` Not quite. What's alerted is the function that was passed to requestAnimationFrame. 1033917 3 andrea.giammarchi 2014-09-08 12:08:04 -0700 Boris is right, it was a copy and paste from Chromium, apologies. 1034082 4 ap 2014-09-08 23:45:44 -0700 *** This bug has been marked as a duplicate of bug 126680 ***