For seo: is the presence of classes in h1-h6 tags relevant?

Question

Search Engine Optimization

For seo: is the presence of classes in h1-h6 tags relevant, and in the case of class names with the same name with tags like h1 class="title"?

Answer 1

No, it's irrelevant.
Yes, and earlier this requirement was caused exclusively by the dense idiocy of the ignorance of SEOs who do not know what after - does not mean as a result.

Answer 2

I think it's semantics. But if you adjust it to a lighthouse. Then he swears more at the lack of title
Everything can not be used.
Preferably h1 (unique per page) and h2. Further, depending on the project