diff --git a/testing/web-platform/tests/css/css-values/reference/vh_not_refreshing_on_chrome-ref.html b/testing/web-platform/tests/css/css-values/reference/vh_not_refreshing_on_chrome-ref.html
index 32ce9ada1556..279d1c69b9f7 100644
--- a/testing/web-platform/tests/css/css-values/reference/vh_not_refreshing_on_chrome-ref.html
+++ b/testing/web-platform/tests/css/css-values/reference/vh_not_refreshing_on_chrome-ref.html
@@ -36,10 +36,10 @@
 			var frameTest = document.getElementById('frameTest');
 
 			// let's resize the iframe vertically only, showing that the vh sizes is not updated.
-			if (height <= 300) {
+			if (height < 300) {
 
 				//frameTest.style.width = height++ + "px";
-				frameTest.style.height = height++ + "px";
+				frameTest.style.height = ++height + "px";
 
 				setTimeout(resizeReference, 10);
 
diff --git a/testing/web-platform/tests/css/css-values/vh_not_refreshing_on_chrome.html b/testing/web-platform/tests/css/css-values/vh_not_refreshing_on_chrome.html
index b4e0a413ab97..52a45a114c85 100644
--- a/testing/web-platform/tests/css/css-values/vh_not_refreshing_on_chrome.html
+++ b/testing/web-platform/tests/css/css-values/vh_not_refreshing_on_chrome.html
@@ -39,10 +39,10 @@
 			var frameTest = document.getElementById('frameTest');
 
 			// let's resize the iframe vertically only, showing that the vh sizes is not updated.
-			if (height <= 300) {
+			if (height < 300) {
 
 				//frameTest.style.width = height++ + "px";
-				frameTest.style.height = height++ + "px";
+				frameTest.style.height = ++height + "px";
 
 				setTimeout(resizeReference, 10);