this is a mix of two technologies: htmx and hyperscript The second attribute (with the code) is hyperscript: https://hyperscript.org https://hyperscript.org

this is a mix of two technologies: htmx and hyperscript The second attribute (with the code) is hyperscript: https://hyperscript.org https://hyperscript.org The first two attributes are htmx and are pure declarative markup, which is the idea with htmx. htmx and hyperscript are designed to work well together, as this demo shows, but they are separate concepts and htmx tries very hard to stay within the original hypermedia model.