I do not know how to determine how Chrome identifies ALL psuedo selectors. But I just did a Chrome search for :first-letter (most likely the style you are looking for, unless it is based on JS)
In DevTools, press ctrl + shift + f , and then search :first-letter
This should search all the files on the website. If you have only one CSS file, you can simply go to it through the sources tab. and then just do ctrl + f to find this file.
You can also try one of these others. The ones that stand out to me: first-letter , nth-letter , first-letter , first-word
List of all psuedos from CSS-Tricks :
:first-child :first-of-type :only-child :last-child :last-of-type :only-of-type :nth-child :nth-of-type :nth-last-child :nth-last-of-type ::first-letter ::first-line ::first-word ::last-letter ::last-line ::last-word ::nth-letter ::nth-line ::nth-word ::nth-last-letter ::nth-last-line ::nth-last-word
If this is not one of them, then it's time to look at JavaScript. To disable JS, I just turned off JS and looked to see if this affects your problem.
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