No hard and fast rule. JS should be treated as an embellishment. Know your audience too. If you’re doing a SPA your audience needs to be techie types. If your a

No hard and fast rule. JS should be treated as an embellishment. Know your audience too. If you’re doing a SPA your audience needs to be techie types. If your audience is everyone then make the site work without JS. If visitors need JS for some functions, state that with <noscript>