[jQuery] How can I find out if a <style> class exists?

[jQuery] How can I find out if a <style> class exists?

I'm working on something that I want a user to be able to override by
including a specific class somewhere in the CSS definitions.  If that
class doesn't exist I want to add a default style.  This seems like
something that should have come up before but search isn't coming up
with anything.  Can someone point me in the right direction?  Local
styles/classes override global classes right?
IOW given the following:
<style>
#myDiv {background: blue;}
</style>
<div id="myDiv" style="background: red">
The div's background would be red, correct?
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