From https://once.com/writebook

app/javascript/controllers/lightbox_controller.js

@@ -0,0 +1,18 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  static targets = [ "image", "dialog", "zoomedImage" ]
+
+  open(event) {
+    this.dialogTarget.showModal()
+    this.#set(event.target.closest("a"))
+  }
+
+  reset() {
+    this.zoomedImageTarget.src = ""
+  }
+
+  #set(target) {
+    this.zoomedImageTarget.src = target.href
+  }
+}