diff --git a/layout/reftests/css-grid/reftest.list b/layout/reftests/css-grid/reftest.list
index d85eefbd0179..19b79f0403da 100644
--- a/layout/reftests/css-grid/reftest.list
+++ b/layout/reftests/css-grid/reftest.list
@@ -213,64 +213,64 @@ asserts(0-10) == grid-fragmentation-015.html grid-fragmentation-015-ref.html # b
 
 # Fragmentation tests that does dynamic content removal/insertions.
 # They should give the same result as the corresponding static test.
-== grid-fragmentation-dyn3-001.html grid-fragmentation-001-ref.html
-== grid-fragmentation-dyn4-001.html grid-fragmentation-001-ref.html
-== grid-fragmentation-dyn1-002.html grid-fragmentation-002-ref.html
-== grid-fragmentation-dyn3-002.html grid-fragmentation-002-ref.html
-== grid-fragmentation-dyn3-003.html grid-fragmentation-003-ref.html
-== grid-fragmentation-dyn4-004.html grid-fragmentation-004-ref.html
-== grid-fragmentation-dyn4-005.html grid-fragmentation-005-ref.html
-== grid-fragmentation-dyn5-005.html grid-fragmentation-005-ref.html
-== grid-fragmentation-dyn1-006.html grid-fragmentation-006-ref.html
-== grid-fragmentation-dyn3-007.html grid-fragmentation-007-ref.html
-== grid-fragmentation-dyn5-007.html grid-fragmentation-007-ref.html
-== grid-fragmentation-dyn5-008.html grid-fragmentation-008-ref.html
-== grid-fragmentation-dyn3-009.html grid-fragmentation-009-ref.html
-== grid-fragmentation-dyn3-009.html grid-fragmentation-009-ref.html
-== grid-fragmentation-dyn4-015.html grid-fragmentation-015-ref.html
-== grid-fragmentation-dyn1-015.html grid-fragmentation-015-ref.html
-== grid-fragmentation-dyn1-016.html grid-fragmentation-016-ref.html
-== grid-fragmentation-dyn5-016.html grid-fragmentation-016-ref.html
-== grid-fragmentation-dyn3-017.html grid-fragmentation-017-ref.html
-== grid-fragmentation-dyn2-018.html grid-fragmentation-018-ref.html
-== grid-fragmentation-dyn1-019.html grid-fragmentation-019-ref.html
-== grid-fragmentation-dyn2-019.html grid-fragmentation-019-ref.html
-== grid-fragmentation-dyn3-019.html grid-fragmentation-019-ref.html
-== grid-fragmentation-dyn4-019.html grid-fragmentation-019-ref.html
-== grid-fragmentation-dyn5-019.html grid-fragmentation-019-ref.html
-== grid-fragmentation-dyn1-020.html grid-fragmentation-020-ref.html
-== grid-fragmentation-dyn2-020.html grid-fragmentation-020-ref.html
-!= grid-fragmentation-dyn1-021.html grid-fragmentation-021-ref.html # bug 1251799
-== grid-fragmentation-dyn2-021.html grid-fragmentation-021-ref.html
-== grid-fragmentation-dyn3-021.html grid-fragmentation-021-ref.html
-asserts(1-10) == grid-fragmentation-dyn4-021.html grid-fragmentation-021-ref.html # assertion related to bug 1251799 ?
-== grid-fragmentation-dyn5-021.html grid-fragmentation-021-ref.html
-== grid-fragmentation-dyn2-022.html grid-fragmentation-007-ref.html
-== grid-fragmentation-dyn1-023.html grid-fragmentation-023-ref.html
-== grid-fragmentation-dyn2-023.html grid-fragmentation-023-ref.html
-== grid-fragmentation-dyn3-023.html grid-fragmentation-023-ref.html
-== grid-fragmentation-dyn4-023.html grid-fragmentation-023-ref.html
-== grid-fragmentation-dyn5-023.html grid-fragmentation-023-ref.html
-== grid-fragmentation-dyn1-024.html grid-fragmentation-024-ref.html
-== grid-fragmentation-dyn2-025.html grid-fragmentation-025-ref.html
-== grid-fragmentation-dyn1-026.html grid-fragmentation-026-ref.html
-== grid-fragmentation-dyn2-026.html grid-fragmentation-026-ref.html
-== grid-fragmentation-dyn3-026.html grid-fragmentation-026-ref.html
-== grid-fragmentation-dyn4-026.html grid-fragmentation-026-ref.html
-== grid-fragmentation-dyn5-026.html grid-fragmentation-026-ref.html
-== grid-fragmentation-dyn1-027.html grid-fragmentation-025-ref.html
-== grid-fragmentation-dyn2-027.html grid-fragmentation-025-ref.html
-== grid-fragmentation-dyn3-027.html grid-fragmentation-025-ref.html
-== grid-fragmentation-dyn4-027.html grid-fragmentation-025-ref.html
-== grid-fragmentation-dyn5-027.html grid-fragmentation-025-ref.html
-== grid-fragmentation-dyn1-028.html grid-fragmentation-028-ref.html
-== grid-fragmentation-dyn2-028.html grid-fragmentation-028-ref.html
-== grid-fragmentation-dyn3-028.html grid-fragmentation-028-ref.html
-== grid-fragmentation-dyn4-028.html grid-fragmentation-028-ref.html
-== grid-fragmentation-dyn5-028.html grid-fragmentation-028-ref.html
-== grid-fragmentation-dyn1-029.html grid-fragmentation-029-ref.html
-== grid-fragmentation-dyn2-029.html grid-fragmentation-029-ref.html
-== grid-fragmentation-dyn2-030.html grid-fragmentation-030-ref.html
-== grid-fragmentation-dyn2-031.html grid-fragmentation-031-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn3-001.html grid-fragmentation-001-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn4-001.html grid-fragmentation-001-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn1-002.html grid-fragmentation-002-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn3-002.html grid-fragmentation-002-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn3-003.html grid-fragmentation-003-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn4-004.html grid-fragmentation-004-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn4-005.html grid-fragmentation-005-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn5-005.html grid-fragmentation-005-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn1-006.html grid-fragmentation-006-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn3-007.html grid-fragmentation-007-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn5-007.html grid-fragmentation-007-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn5-008.html grid-fragmentation-008-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn3-009.html grid-fragmentation-009-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn3-009.html grid-fragmentation-009-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn4-015.html grid-fragmentation-015-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn1-015.html grid-fragmentation-015-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn1-016.html grid-fragmentation-016-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn5-016.html grid-fragmentation-016-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn3-017.html grid-fragmentation-017-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn2-018.html grid-fragmentation-018-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn1-019.html grid-fragmentation-019-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn2-019.html grid-fragmentation-019-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn3-019.html grid-fragmentation-019-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn4-019.html grid-fragmentation-019-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn5-019.html grid-fragmentation-019-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn1-020.html grid-fragmentation-020-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn2-020.html grid-fragmentation-020-ref.html
+fuzzy-if(webrender,1,120) != grid-fragmentation-dyn1-021.html grid-fragmentation-021-ref.html # bug 1251799
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn2-021.html grid-fragmentation-021-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn3-021.html grid-fragmentation-021-ref.html
+fuzzy-if(webrender,1,120) asserts(1-10) == grid-fragmentation-dyn4-021.html grid-fragmentation-021-ref.html # assertion related to bug 1251799 ?
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn5-021.html grid-fragmentation-021-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn2-022.html grid-fragmentation-007-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn1-023.html grid-fragmentation-023-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn2-023.html grid-fragmentation-023-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn3-023.html grid-fragmentation-023-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn4-023.html grid-fragmentation-023-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn5-023.html grid-fragmentation-023-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn1-024.html grid-fragmentation-024-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn2-025.html grid-fragmentation-025-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn1-026.html grid-fragmentation-026-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn2-026.html grid-fragmentation-026-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn3-026.html grid-fragmentation-026-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn4-026.html grid-fragmentation-026-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn5-026.html grid-fragmentation-026-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn1-027.html grid-fragmentation-025-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn2-027.html grid-fragmentation-025-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn3-027.html grid-fragmentation-025-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn4-027.html grid-fragmentation-025-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn5-027.html grid-fragmentation-025-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn1-028.html grid-fragmentation-028-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn2-028.html grid-fragmentation-028-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn3-028.html grid-fragmentation-028-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn4-028.html grid-fragmentation-028-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn5-028.html grid-fragmentation-028-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn1-029.html grid-fragmentation-029-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn2-029.html grid-fragmentation-029-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn2-030.html grid-fragmentation-030-ref.html
+fuzzy-if(webrender,1,120) == grid-fragmentation-dyn2-031.html grid-fragmentation-031-ref.html
 == bug1306106.html bug1306106-ref.html
 == grid-percent-intrinsic-sizing-001.html grid-percent-intrinsic-sizing-001-ref.html