A screenshot of the Frequency website with JavaScript disabled, showing the exact same message Mastodon shows when JavaScript is disabled: "To use the Mastodon web application, please enable JavaScript. Alternatively, try one of the native apps for Mastodon for your platform."
https://files.mastodon.social/media_attachments/files/113/886/790/174/493/394/original/589cb09387a6db04.png