--- a/layout/reftests/w3c-css/failures.list
+++ b/layout/reftests/w3c-css/failures.list
@@ -13,10 +13,8 @@ css-values-3/attr-length-invalid-cast.ht
 css-values-3/attr-length-valid-zero-nofallback.html
 css-values-3/attr-length-valid-zero.html
 css-values-3/attr-length-valid.html
 css-values-3/attr-px-invalid-cast.html
 css-values-3/attr-px-valid.html
 # Bug 1256575
 css-values-3/calc-in-media-queries-001.html
 css-values-3/calc-in-media-queries-002.html
-# Bug 1256579
-css-values-3/vh-interpolate-pct.html

--- a/layout/reftests/w3c-css/received/css-values-3/vh-interpolate-pct.html
+++ b/layout/reftests/w3c-css/received/css-values-3/vh-interpolate-pct.html
@@ -26,17 +26,17 @@
 
 	<style type="text/css">
 
 			@keyframes anim {
 				from { width: 0%; height: 0%; }
 				to   { width: 200vw; height: 200vh; }
 			}
 
-			html, body { margin: 0px; padding: 0px; }
+			html, body { margin: 0px; padding: 0px; height: 100%; }
 
 			html { background: red; overflow: hidden; }
 			#outer { position: relative; background: green; }
 			#outer { animation: anim 2000000s; animation-delay: -1000000s; }
 
 	</style>
 
 </head>

--- a/layout/reftests/w3c-css/received/import.log
+++ b/layout/reftests/w3c-css/received/import.log
@@ -1,9 +1,9 @@
-Importing revision: bbc09e4c2581d270eb7b8b9704032d2b745c20e1
+Importing revision: 9ec930459141785bdf59b0bf6ec0cc3e73435d00
 from repository: https://hg.csswg.org/test
 Importing css-conditional-3/at-media-whitespace-optional-001.html to css-conditional-3/at-media-whitespace-optional-001.html
 Importing css-conditional-3/reference/background-lime.html to css-conditional-3/background-lime.html
 Importing css-conditional-3/at-media-whitespace-optional-002.html to css-conditional-3/at-media-whitespace-optional-002.html
 Importing css-conditional-3/at-supports-001.html to css-conditional-3/at-supports-001.html
 Importing css-conditional-3/at-supports-001-ref.html to css-conditional-3/at-supports-001-ref.html
 Importing css-conditional-3/at-supports-002.html to css-conditional-3/at-supports-002.html
 Importing css-conditional-3/at-supports-003.html to css-conditional-3/at-supports-003.html

--- a/layout/reftests/w3c-css/received/reftest.list
+++ b/layout/reftests/w3c-css/received/reftest.list
@@ -84,17 +84,17 @@ fails == css-values-3/calc-in-media-quer
 == css-values-3/calc-invalid-range-clamping.html css-values-3/200-200-green.html
 == css-values-3/calc-parenthesis-stack.html css-values-3/all-green.html
 skip == css-values-3/ch-unit-001.html css-values-3/ch-unit-001-ref.html
 == css-values-3/initial-background-color.html css-values-3/all-green.html
 == css-values-3/vh-calc-support-pct.html css-values-3/all-green.html
 == css-values-3/vh-calc-support.html css-values-3/all-green.html
 == css-values-3/vh-em-inherit.html css-values-3/all-green.html
 == css-values-3/vh-inherit.html css-values-3/all-green.html
-fails == css-values-3/vh-interpolate-pct.html css-values-3/all-green.html
+== css-values-3/vh-interpolate-pct.html css-values-3/all-green.html
 == css-values-3/vh-interpolate-px.html css-values-3/all-green.html
 == css-values-3/vh-interpolate-vh.html css-values-3/all-green.html
 == css-values-3/vh-support-atviewport.html css-values-3/all-green.html
 == css-values-3/vh-support-margin.html css-values-3/all-green.html
 skip == css-values-3/vh-support-transform-origin.html css-values-3/all-green.html
 skip == css-values-3/vh-support-transform-translate.html css-values-3/all-green.html
 == css-values-3/vh-support.html css-values-3/all-green.html
 == css-values-3/vh-zero-support.html css-values-3/all-green.html