In CONF-17151, it was established that if a page contains more than 32 CSS imports, IE will randomly drop CSS files and/or JavaScript includes, causing random and difficult-to-debug failures.

The implemented fix batched up the CSS imports for the bundled plugins, reducing the number of import statements, but is not a permanent solution to the problem.

We should have a test that asserts that the default number of CSS imports on any given Confluence page is less than a defined number (possibly around 20, which gives buffer room for 3rd-party plugins to include their own). Thus, a few years down the track when we all forget and the number of CSS imports creeps up again, we'll see a test failure before we start seeing random JavaScript errors in IE.

Created as a separate issue from CONF-17151, as writing the automated test is a lower priority task that shouldn't delay the release process.