External stylesheets either not downloading or not being applied in very rare cases
I recall some very rare instances of seeing major websites (Amazon, Facebook, etc.) either not downloading a CSS file or not applying the rules, causing the page to look like this:
I've been tasked to provide an internal explanation after we received a complaint email with an attached screenshot from a user of one of our websites showing the same effect. The screenshot contains sensitive user information, so I'm unable to post it. But it shows that inline styles are being applied, but any style referenced from an external CSS file isn't being applied.
Unfortunately, I am unable to reproduce this issue, and other than just saying "styles aren't being applied", I am coming up dry with a detailed explanation and I would love to understand it myself.
I would appreciate any input on why this might happen, or reference to any articles. Even if someone knows what this event is called, I would be happy to go research it, but as of now I'm coming up blank.
There are more than one scenarios under which this can occur:
1) bandwith issues : as italo.nascimento mentioned, a slow connection, where your HTML is downloaded but your CSS is timed-out so you're left with a naked HTML page (happens often also when a website is under DoS or has many many visitors and the server can't keep up with the traffic)
2) caching problems : something is changed in your HTML, but the CSS is served from the browser's local cache so the selectors don't match...
3) FOUC : It's not really similar to what you're asking, unless the printscreens were made during the page load.. It's called Flash of Unstyled Content.
In general 90% of these kinds of problems are cause by connection issues. Dropped packets, TimeOuts, CDN's not working properly.. And as they are random I don't think you can "reproduce them" - it's not something that can get fixed.
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