The intersection of HTMX and Web Components often leads to a frustrating paradox: the encapsulation that makes Web Components powerful is exactly what breaks HTMX's declarative model. If you have attempted to place hx-trigger , hx-target , or hx-get attributes inside a standard attachShadow({ mode: 'open' }) component, you likely encountered silence. No network requests. No errors. Just a non-responsive UI. This post details why the Shadow Boundary acts as an event black hole for HTMX and provides a rigorous HTMXShadowComponent base class to bridge the gap. The Root Cause: Event Retargeting and Observer Scope HTMX relies on two mechanisms to function: DOM Scanning: On load (and after swaps), htmx.process() scans the DOM to attach event listeners to elements with hx-* attributes. Event Delegation/Bubbling: For certain triggers, HTMX relies on events bubbling up to a container where a listener handl...
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