diff --git a/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/use-a-retina-image-for-higher-resolution-displays.english.md b/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/use-a-retina-image-for-higher-resolution-displays.english.md
index 3c7b8a1559..4b6be6825c 100644
--- a/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/use-a-retina-image-for-higher-resolution-displays.english.md
+++ b/curriculum/challenges/english/01-responsive-web-design/responsive-web-design-principles/use-a-retina-image-for-higher-resolution-displays.english.md
@@ -34,9 +34,9 @@ Set the <code>width</code> and <code>height</code> of the <code>img</code> tag t
 ```yml
 tests:
   - text: Your <code>img</code> tag should have a <code>width</code> of 100 pixels.
-    testString: assert($('img').css('width') == '100px');
+    testString: assert(document.querySelector('img').width === 100);
   - text: Your <code>img</code> tag should have a <code>height</code> of 100 pixels.
-    testString: assert($('img').css('height') == '100px');
+    testString: assert(document.querySelector('img').height === 100);
 
 ```