Quotes are completely optional on attribute values in HTML5 if the value doesn't have certain characters like spaces which will require quoting I've found this

Quotes are completely optional on attribute values in HTML5 if the value doesn't have certain characters like spaces which will require quoting I've found this article a handy reference on all the stuff it's safe to leave out https://meiert.com/en/blog/optional-html/ https://meiert.com/en/blog/optional-html/