--- a/layout/reftests/w3c-css/failures.list
+++ b/layout/reftests/w3c-css/failures.list
@@ -111,18 +111,17 @@ fuzzy-if(winWidget,110,1200) css-writing
 fuzzy-if(OSX||winWidget,110,1200) css-writing-modes-3/table-column-order-srl-006.xht
 fuzzy-if(OSX||winWidget,75,404)   css-writing-modes-3/text-align-v??-0??.xht
 fuzzy-if(OSX||winWidget,215,780)  css-writing-modes-3/text-baseline-???-00?.xht
 fuzzy-if(OSX,15,16) fails-if(webrender) css-writing-modes-3/text-combine-upright-decorations-001.html
 fuzzy-if(OSX||winWidget,255,480)  css-writing-modes-3/text-indent-v??-0??.xht
 fuzzy-if(OSX||winWidget,226,960)  css-writing-modes-3/text-orientation-016.xht
 fuzzy-if(OSX||winWidget,223,720)  css-writing-modes-3/vertical-alignment-*.xht
 fuzzy-if(OSX||winWidget,153,612)  css-writing-modes-3/writing-mode-vertical-??-00?.*
-fuzzy(255,960) css-writing-modes-3/text-combine-upright-value-all-00?.html
-fuzzy(255,960) css-writing-modes-3/text-combine-upright-value-all-001.html
+fuzzy(255,960) random-if(webrender) css-writing-modes-3/text-combine-upright-value-all-00?.html
 
 # Bug 1167911
 skip css-writing-modes-3/abs-pos-non-replaced-icb-vlr-021.xht
 skip css-writing-modes-3/abs-pos-non-replaced-icb-vrl-020.xht
 
 # Bug 1244601
 fails css-writing-modes-3/block-flow-direction-slr-058.xht
 fails css-writing-modes-3/block-flow-direction-srl-057.xht

--- a/layout/reftests/w3c-css/received/reftest.list
+++ b/layout/reftests/w3c-css/received/reftest.list
@@ -1073,21 +1073,21 @@ fuzzy-if(OSX||winWidget,215,780) == css-
 fuzzy-if(OSX||winWidget,215,780) == css-writing-modes-3/text-baseline-vrl-002.xht css-writing-modes-3/text-baseline-vrl-002-ref.xht
 fuzzy-if(OSX||winWidget,215,780) == css-writing-modes-3/text-baseline-vrl-004.xht css-writing-modes-3/text-baseline-vrl-002-ref.xht
 fuzzy-if(OSX||winWidget,215,780) == css-writing-modes-3/text-baseline-vrl-006.xht css-writing-modes-3/text-baseline-vrl-006-ref.xht
 fuzzy-if(OSX,15,16) fails-if(webrender) == css-writing-modes-3/text-combine-upright-decorations-001.html css-writing-modes-3/reference/text-combine-upright-decorations-001.html
 == css-writing-modes-3/text-combine-upright-inherit-all-001.html css-writing-modes-3/reference/text-combine-upright-inherit-all-001.html
 == css-writing-modes-3/text-combine-upright-inherit-all-002.html css-writing-modes-3/reference/text-combine-upright-inherit-all-002.html
 == css-writing-modes-3/text-combine-upright-layout-rules-001.html css-writing-modes-3/reference/text-combine-upright-layout-rules-001-ref.html
 == css-writing-modes-3/text-combine-upright-line-breaking-rules-001.html css-writing-modes-3/text-combine-upright-line-breaking-rules-001-ref.html
-fuzzy(255,960) == css-writing-modes-3/text-combine-upright-value-all-001.html css-writing-modes-3/reference/text-combine-upright-value-single-character.html
-fuzzy(255,960) == css-writing-modes-3/text-combine-upright-value-all-002.html css-writing-modes-3/reference/vertical-ahem-1x1-ref.html
-fuzzy(255,960) != css-writing-modes-3/text-combine-upright-value-all-002.html css-writing-modes-3/reference/horizontal-ahem-1x1-notref.html
-fuzzy(255,960) == css-writing-modes-3/text-combine-upright-value-all-003.html css-writing-modes-3/reference/vertical-ahem-1x1-ref.html
-fuzzy(255,960) != css-writing-modes-3/text-combine-upright-value-all-003.html css-writing-modes-3/reference/horizontal-ahem-1x1-notref.html
+fuzzy(255,960) random-if(webrender) == css-writing-modes-3/text-combine-upright-value-all-001.html css-writing-modes-3/reference/text-combine-upright-value-single-character.html
+fuzzy(255,960) random-if(webrender) == css-writing-modes-3/text-combine-upright-value-all-002.html css-writing-modes-3/reference/vertical-ahem-1x1-ref.html
+fuzzy(255,960) random-if(webrender) != css-writing-modes-3/text-combine-upright-value-all-002.html css-writing-modes-3/reference/horizontal-ahem-1x1-notref.html
+fuzzy(255,960) random-if(webrender) == css-writing-modes-3/text-combine-upright-value-all-003.html css-writing-modes-3/reference/vertical-ahem-1x1-ref.html
+fuzzy(255,960) random-if(webrender) != css-writing-modes-3/text-combine-upright-value-all-003.html css-writing-modes-3/reference/horizontal-ahem-1x1-notref.html
 skip == css-writing-modes-3/text-combine-upright-value-digits2-001.html css-writing-modes-3/reference/text-combine-upright-value-single-character.html
 skip == css-writing-modes-3/text-combine-upright-value-digits2-002.html css-writing-modes-3/reference/vertical-ahem-1x1-ref.html
 skip != css-writing-modes-3/text-combine-upright-value-digits2-002.html css-writing-modes-3/reference/horizontal-ahem-1x1-notref.html
 == css-writing-modes-3/text-combine-upright-value-digits2-003.html css-writing-modes-3/reference/vertical-ahem-1x3-ref.html
 != css-writing-modes-3/text-combine-upright-value-digits2-003.html css-writing-modes-3/reference/horizontal-ahem-1x3-notref.html
 skip == css-writing-modes-3/text-combine-upright-value-digits3-001.html css-writing-modes-3/reference/vertical-ahem-1x1-ref.html
 skip != css-writing-modes-3/text-combine-upright-value-digits3-001.html css-writing-modes-3/reference/horizontal-ahem-1x1-notref.html
 skip == css-writing-modes-3/text-combine-upright-value-digits3-002.html css-writing-modes-3/reference/vertical-ahem-1x1-ref.html