Well sort of. So our convention here is to use flc- prefixed classes only for selectors used in js. Meaning they never show up in css. fl- classes are used for styling purposes and will usually only show up in css or in the styles block of a component. This disambiguates their usage, allowing an integrator or another developer to 1) easily identify the parts and purposes in markup 2) to modify them and have an understanding of what might be affected. In the case here, I might come along and change the name to say gpii-prefsEditor-increaseSizePanel and update the markpu and js file. However, the styling would have broken unexpectedly because it was also used there. By the way, you'll probably want to adopt a gpii namespace for your custom classes at some point. Perhaps you can talk to others about what to standardize on.