This is a language server I've been working on for a while now, which warns the programmer (or agent) of low browser support for web features (HTML, CSS, JavaScript) right in your editor. You can also hover over almost all web features and get its support percentage and caniuse.com link.
This project is handmade, no AI was used.
Preview images & setup instructions found in the repo README. There are VS Code and Zed extensions.