61473 2011-05-25 15:06:55 -0700 REGRESSION (r67163): twitter.com doesn't load properly the first time 2012-06-21 15:24:14 -0700 1 1 1 Unclassified WebKit DOM 528+ (Nightly build) All All RESOLVED FIXED http://twitter.com InRadar, NeedsReduction, Regression P1 Critical --- 45310 1 aestes webkit-unassigned abarth aestes eoconnor esprehn tonyg oldest_to_newest 409952 0 aestes 2011-05-25 15:06:55 -0700 In some cases, twitter.com fails to load the timeline with a cold cache. The black toolbar loads, but a JavaScript error prevents the rest of the page from loading. The error is typically something like: TypeError: 'undefined' is not an object (evaluating 'twttr.anywhere.api') See the attached screenshot to see what the page looks like when this happens. The problem seems to be specific to a subset of twitter accounts and usually goes away if you reload the page. Since I am able to see this error, I'll work on a reduction. 409953 1 aestes 2011-05-25 15:07:15 -0700 <rdar://problem/9491632> 409954 2 aestes 2011-05-25 15:08:51 -0700 This is a regression due to <http://trac.webkit.org/changeset/67163> 409964 3 aestes 2011-05-25 15:22:35 -0700 There is a JavaScript function in the main document called initAPI() that calls twttr.anywhere.api.initialize(). twttr.anywhere.api is defined in an external resource that is included earlier in the main document using: <script type="text/javascript" async="" src="https://si1.twimg.com/a/1306171173/javascripts/api.bundle.js"></script> Since the script tag has the async attribute, it can load after initAPI() executes. Sounds like a race condition. 409966 4 abarth 2011-05-25 15:26:03 -0700 Sounds like we should evangelize them to not use async and rely on script ordering! 410025 5 eoconnor 2011-05-25 16:46:54 -0700 I've evang'ed; they already knew about this, and have a fix on the way. 410037 6 aestes 2011-05-25 17:05:29 -0700 (In reply to comment #5) > I've evang'ed; they already knew about this, and have a fix on the way. That's great! Do you have any sense of timeframe so we know when to verify the fix? 410148 7 eoconnor 2011-05-25 20:19:37 -0700 I'll ask. 654938 8 esprehn 2012-06-21 15:24:14 -0700 They don't even include the referenced script anymore and it appears they're using async more carefully.