HTMX is a small (~14k), dependency-free, extendable frontend framework, with a very straightforward approach. It extends the Hypertext capabilities of HTML, without the need of using JavaScript.

Basic concepts:

• Any DOM element can trigger HTTP requests
• Any HTTP methods can be used (not just GET and POST)
• The response from the server is HTML or HTML fragment
• State management is is server-side, frontend is simple and dummy

Google: “page experience” will be (June 2021) part of search ranking

What

• LCP: Largest Contentful Paint
• FID: First Input Delay (RUM only)
• CLS: Cumulative Layout Shift