refactor: update isVisible function

Author: mrholek

js/src/util/index.js

@@ -146,7 +146,26 @@ const isVisible = element => {
     return false
   }
 
-  return getComputedStyle(element).getPropertyValue('visibility') === 'visible'
+  const elementIsVisible = getComputedStyle(element).getPropertyValue('visibility') === 'visible'
+  // Handle `details` element as its content may falsie appear visible when it is closed
+  const closedDetails = element.closest('details:not([open])')
+
+  if (!closedDetails) {
+    return elementIsVisible
+  }
+
+  if (closedDetails !== element) {
+    const summary = element.closest('summary')
+    if (summary && summary.parentNode !== closedDetails) {
+      return false
+    }
+
+    if (summary === null) {
+      return false
+    }
+  }
+
+  return elementIsVisible
 }
 
 const isDisabled = element => {