In addition, the following changes were made: Most error events collapse into htmx:error. HTTP error responses fire htmx:response:error. The htmx:xhr:* events are removed. htmx 4 uses fetch(). The htmx:validation:* events are removed in favor of native browser form validation. The full table is in What’s New in htmx 4. The command line upgrade checker flags old event names in hx-on attributes and

