* Dark Mode support is available as an opt-in feature for site owners.

* The toggle button has been removed from the editor’s interface and is only available in the Customizer.

* The Dark Mode toggle button is located in the bottom right corner (left on RTL) and disappears when the site viewer scrolls down the page.

* With Dark Mode enabled, site viewers can switch it on/off depending on their personal preferences, and regardless of their OS/browser settings.

Even if Dark Mode is considered an accessibility improvement, it’s not obvious that your site pages would be more accessible in every context.