You should still look at your site with JavaScript disabled.

Even today, it’s still worth looking at your sites with JavaScript disabled.

Many of them have either a couple of elements that depend on JS to show/hire correctly, or a big chunk of the page rendered as a single-page application.

In either case, the user interface isn’t “ready” after page load until JS has a chance to download, parse, and execute, which means core web vitals like largest contentful paint and cumulative layout shift are at risk. For your users, it means a flash of jank when they visit the page.

Some of the fixes for this are simple (ex: use CSS to hide elements that should be invisible by default), and others might get a little crazier (ex. prerender an embedded SPA into part of a page).

Fortunately, this stuff is easy to diagnose. Disable JavaScript, load the page, and see what’s ugly.