What Might Cause CSS to Fail to Load Occasionally on All Browsers

What might cause CSS to fail to load occasionally on all browsers?

I've had a similar thing happen that I was able to fix by including a base style sheet first using the "link rel" method rather than "@import". i.e. move your [base css file] inclusion to:

<link rel="stylesheet" href="[base css file]" type="text/css" media="screen" />

and put it before the others.

Complete list of reasons why a css file might not be working

1. Are you sure the stylesheet is loaded? You can see it using the "Net" tab of Firebug on firefox, or on "Network" tab of the Console of your browser.

2. (If 1 works) can you have a simple sample style and see whether this is getting applied (and visible in the console)?

Flask does not load CSS file..?

Flask sets cache control headers on static resources, and your browser will cache those files up to 12 hours.

Your options are:

• Set the SEND_FILE_MAX_AGE_DEFAULT configuration directive to a shorter value; it is set to 43200 but you can set it to 0 if you really want to.

• Add a cache buster query parameter to your static URLs; if your static URLs end with ?<somerandomvalue> your browser will reload the resource if that random value ever changes. You could do this by hand each time or you can use this Flask snippet to override the url_for() function to add such a value for you based on the file modification time.

• Use an incognito browser window (private browsing mode in other browsers) to force your browser to ignore the cache for a specific session. Each time you open a new incognito tab or window, the cache should be invalidated for that session.

Images (and css) randomly fails to load with no apparent reason

After not being able to solve the issue for a couple of days. I've decided to redeploy everything using a slightly different method.
That solved the issue but the reason behind slow/random load fails stays unknown.

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