As for it's importance. Well, maybe it has something to do with optimizations? (well, once you've found an id, there's technically no need to look for it anyfurther). Also, id's weigh alot in the ...
CSS class names have no impact on SEO and aren't read as content by Google. Oversized CSS files can slow pages down and hurt Core Web Vitals scores. Google recommends keeping CSS crawlable to ensure ...