fix(checkout): Safari/iOS autofill not triggering password strength check

assets/js/checkout.js

@@ -873,6 +873,13 @@
 
 					this.request('wu_validate_form', form_data, function (results) {
 
+						// Safari/iOS autofill does NOT fire keyup/input events, so
+						// valid_password may be stale at submit time. Force a
+						// synchronous re-check before deciding to show the error.
+						if (! that.valid_password && that.password_strength_checker) {
+							that.password_strength_checker.checkStrength();
+						}
+
 						if (! that.valid_password) {
 
 							that.errors.push({

assets/js/wu-password-strength.js

@@ -107,17 +107,38 @@
 			// Set initial message
 			this.options.result.html(this.getStrengthLabel('empty'));
 
-			// Bind events
-			this.options.pass1.on('keyup input', function() {
+			// Bind events.
+			// Include 'change' for Safari/iOS autofill which does NOT fire
+			// keyup/input when auto-generating or pasting passwords (WebKit bug).
+			this.options.pass1.on('keyup input change', function() {
 				self.checkStrength();
 			});
 
 			if (this.options.pass2 && this.options.pass2.length) {
-				this.options.pass2.on('keyup input', function() {
+				this.options.pass2.on('keyup input change', function() {
 					self.checkStrength();
 				});
 			}
 
+			// Safari autofill detection — poll for value changes that bypass all
+			// DOM events (known WebKit bug). Stops after 60 seconds to avoid
+			// unnecessary CPU usage once the user has had time to fill the form.
+			this._lastPass1Val = '';
+			this._autofillPoll = setInterval(function() {
+				var currentVal = self.options.pass1.val();
+				if (currentVal !== self._lastPass1Val) {
+					self._lastPass1Val = currentVal;
+					self.checkStrength();
+				}
+			}, 1000);
+
+			setTimeout(function() {
+				if (self._autofillPoll) {
+					clearInterval(self._autofillPoll);
+					self._autofillPoll = null;
+				}
+			}, 60000);
+
 			// Disable submit initially if provided
 			if (this.options.submit && this.options.submit.length) {
 				this.options.submit.prop('disabled', true);