Start going through ValidationUtil.warn calls

lib/src/component/abstract_transition.dart

@@ -182,14 +182,14 @@ abstract class AbstractTransitionComponent<T extends AbstractTransitionProps, S
         warningMessage += ' Instead of setting this prop to 0, override the `hasTransition` getter to return false.';
       }
 
-      assert(ValidationUtil.warn(warningMessage));
+      assert(ValidationUtil.warn(warningMessage, this));
 
       skipCount = 0;
     }
 
     var timer = new Timer(transitionTimeout, () {
       assert(ValidationUtil.warn(
-        'The number of transitions expected to complete have not completed. Something is most likely wrong.'
+        'The number of transitions expected to complete have not completed. Something is most likely wrong.', this
       ));
 
       complete();

lib/src/component/resize_sensor.dart

@@ -113,7 +113,7 @@ class ResizeSensorComponent extends UiComponent<ResizeSensorProps> with _SafeAni
   void componentDidMount() {
     if (props.quickMount) {
       assert(props.onInitialize == null || ValidationUtil.warn(
-          'props.onInitialize will not be called when props.quickMount is true.'
+          'props.onInitialize will not be called when props.quickMount is true.', this
       ));
 
       // [1] Initialize/reset the sensor in the next animation frame after mount

lib/src/component_declaration/component_base.dart

@@ -401,7 +401,7 @@ abstract class UiProps
         );
 
         // TODO: Remove ValidationUtil.warn call when https://github.com/dart-lang/sdk/issues/26093 is resolved.
-        ValidationUtil.warn(errorMessage);
+        ValidationUtil.warn(errorMessage, this);
         throw new ArgumentError(errorMessage);
       }
     }

lib/src/util/dom_util.dart

@@ -138,7 +138,7 @@ void setSelectionRange(/* TextInputElement | TextAreaElement */Element input, in
             Google Chrome does not support `setSelectionRange` on email or number inputs.
             See: https://bugs.chromium.org/p/chromium/issues/detail?id=324360
             '''
-        )));
+        ), input));
 
         return;
       }

lib/src/util/validation_util.dart

@@ -16,6 +16,8 @@ library over_react.validation_util;
 
 import 'dart:html';
 
+import 'package:over_react/over_react.dart';
+
 typedef void ValidationUtilWarningCallback(String message);
 
 /// Utility for logging validation errors or warning.
@@ -31,7 +33,7 @@ class ValidationUtil {
   ///     assert(ValidationUtil.warn('Some warning message'));
   ///
   /// The message will get print out to the console.
-  static bool warn(String message) {
+  static bool warn(String message, [dynamic element]) {
     WARNING_COUNT += 1;
 
     if (onWarning != null) {
@@ -44,6 +46,10 @@ class ValidationUtil {
       }
 
       window.console.warn('VALIDATION WARNING: $message');
+
+      if(element != null) {
+          window.console.warn(findDomNode(element));
+      }
     }
 
     return true;

web/src/demo_components/button_group.dart

@@ -100,14 +100,14 @@ class ButtonGroupComponent<T extends ButtonGroupProps, S extends ButtonGroupStat
     if (isValidElement(child)) {
       if (!isComponentOfType(child, childFactory)) {
         assert(ValidationUtil.warn(
-            'An unexpected child type was found within this component.'
+            'An unexpected child type was found within this component.', this
         ));
       }
 
       isCloneable = true;
     } else if (child != null) {
       assert(ValidationUtil.warn(
-          'You are not using a valid ReactElement.'
+          'You are not using a valid ReactElement.', this
       ));
     }