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I have many times found CSS written on my screen besides images from Stack OverFlow.

It is associated with the advert from Rackspace

Here is a screenshot:

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On what page do you see this? –  Ionică Bizău Dec 24 '13 at 16:20
    
I am reading answers on my question.In that page..and it is always with this red image. –  vivek Dec 24 '13 at 16:22
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Yeah, I can confirm this bug. Voted. –  Ionică Bizău Dec 24 '13 at 16:22
    
i.imgur.com/r4w12yr.png –  Ionică Bizău Dec 24 '13 at 16:23
    
Looks like they tried to use regex to parse their HTML. –  Michael Hampton Dec 27 '13 at 8:57
    
@vivek Experiencing this issue any more? I'd like to mark it status-completed if not. –  stevvve Jan 15 at 16:56
    
yes right now no issues...you can go for it...@stevvve –  vivek Jan 15 at 17:27

3 Answers 3

This looks like an advertiser forgot to put an opening tag in their HTML, and did something like this

width="0" height="0" style="position:absolute;" etc etc>100% ssd, 10 GigE blah blah</div>

Fairly easy to fix, but not sure how it got past the people in charge of putting the ads on

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Wait. What? Why do the advertisers get to control the HTML? –  qwertynl Dec 24 '13 at 20:04
    
@qwertynl they get an iframe, they control its HTML. They have no control over the HTML outside the frame. –  Shadow Wizard Dec 24 '13 at 22:30
    
@qwertynl they probably get to control it only to some extent. naturally they cannot do simply anything because if an advertising provider's ads became rife with XSS attempts and horrible things, nobody would use that advertising provider and they'd go bankrupt. –  doppelgreener Dec 28 '13 at 12:50

@Vivek I can't seem to reproduce this error. Are you (or anyone else who experienced it) still observing this issue?

I checked out the question you took a screenshot of above, and even when ads for that advertiser appear I don't have that issue. ajemplo


Update:
The campaign in question is now paused and the advertiser is in the process of sending us new creative. Will update here when new creative is live.


Moar Update:
The advertiser updated their tags and this campaign is now live again. If anyone observes any issues, please let us know.

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yes...I have experienced this thing many times...And when I reload that page it work fine. –  vivek Dec 26 '13 at 14:38
    
Reproduced now, first try, IE11: i.stack.imgur.com/Snvxf.png –  Shadow Wizard Dec 26 '13 at 14:42
    
@vivek what browser? Maybe it's IE only problem? –  Shadow Wizard Dec 26 '13 at 14:43
    
@ShadowWizard I reproed it a few hours after this question was first posted in Ipad/Safari and Chrome/Windows as well so it definitely wasn't browser specific then. –  Martin Smith Dec 26 '13 at 15:49
    
@MartinSmith yeah, it appears to be server side. stevvve please see my answer (too long for comment) can you send those details to the advertiser and ask them to track it down? –  Shadow Wizard Dec 26 '13 at 15:53
    
@ShadowWizard...I am using only firefox –  vivek Dec 26 '13 at 16:53
    
I just got this on error Server Fault as well using Firefox 26. Same advertisement as the screenshot in the question. –  Matt Chan Dec 26 '13 at 21:28
    
@stevvve just in case you missed my prev comment... did you see what I wrote in my answer? –  Shadow Wizard Dec 27 '13 at 8:26
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@ShadowWizard Yep, currently kicking over some rocks to get to the bottom of the error and getting it fixed as soon as possible. –  stevvve Dec 27 '13 at 15:24
    
@stevvve thanks, but isn't it the advertiser's responsibility? –  Shadow Wizard Dec 27 '13 at 18:44
    
@ShadowWizard It is, but given that it's a time of year when many people are not working, it makes more sense for anyone aware of an issue to do whatever possible to fix it. –  stevvve Dec 27 '13 at 19:01
    
Thanks for the update! I fear the bug is in their platform though, so better keep an open eye on their new ad too. –  Shadow Wizard Jan 2 at 18:38

I was able to desolate the bug. When it breaks, this is the generated HTML: (the width="0" height="0" etc are right after this, outside the tag hence showing bare on the page)

<img src="http://data.cmcore.com/imp?tid=17&amp;ci=90378805&amp;vn1=4.1.1&amp;vn2=e4.0&amp;ec=UTF-8&amp;cm_mmc=SMB12Display-_-StackOver-_-Dev-_-PerfLanguage<http://data.cmcore.com/imp?tid=17&amp;ci=90378805&amp;vn1=4.1.1&amp;vn2=e4.0&amp;ec=UT%20F-8&amp;cm_mm" c="SMB12Display-_-StackOver-_-Dev-_-PerfLanguage">

The "proper" HTML of this ad is:

<img width="0" height="0" style="left: 0px; top: 0px; position: absolute;" src="http://data.cmcore.com/imp?tid=17&amp;ci=90378805&amp;vn1=4.1.1&amp;vn2=e4.0&amp;ec=UTF-8&amp;cm_mmc=SMB12Display-_-StackOver-_-Dev-_-NewPerfStandard">

It appeears to be server side and only happen on first hit, or after hard refresh.

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I like this notion of desolating bugs. "ACME Software! We don't just squash the bugs you report. We desolate them! They'll think twice before engaging in error-report uprisings again!" –  Jonathan Garber Dec 26 '13 at 18:52

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