diff --git a/tests/wpt/webgl/meta/MANIFEST.json b/tests/wpt/webgl/meta/MANIFEST.json
index a3731db597b..831dbd8c340 100644
--- a/tests/wpt/webgl/meta/MANIFEST.json
+++ b/tests/wpt/webgl/meta/MANIFEST.json
@@ -14690,7 +14690,9 @@
    "conformance/rendering/multisample-corruption.html": [
     [
      "conformance/rendering/multisample-corruption.html",
-     {}
+     {
+      "timeout": "long"
+     }
     ]
    ],
    "conformance/rendering/negative-one-index.html": [
@@ -15452,7 +15454,9 @@
    "conformance/textures/misc/tex-video-using-tex-unit-non-zero.html": [
     [
      "conformance/textures/misc/tex-video-using-tex-unit-non-zero.html",
-     {}
+     {
+      "timeout": "long"
+     }
     ]
    ],
    "conformance/textures/misc/texparameter-test.html": [
@@ -36719,7 +36723,7 @@
    "testharness"
   ],
   "conformance/rendering/multisample-corruption.html": [
-   "7de9b47f229ac935cdb76b14e6237243ae14ce04",
+   "db9fb69975dfb1acd5e490c756e7221f8d176cb1",
    "testharness"
   ],
   "conformance/rendering/negative-one-index.html": [
@@ -37279,7 +37283,7 @@
    "testharness"
   ],
   "conformance/textures/misc/tex-video-using-tex-unit-non-zero.html": [
-   "9abe3bd71772133857507f18a5a6fcfc95b080da",
+   "288260b019d12a753c0677f5747746545867e5e7",
    "testharness"
   ],
   "conformance/textures/misc/texparameter-test.html": [
diff --git a/tests/wpt/webgl/meta/conformance/context/context-creation.html.ini b/tests/wpt/webgl/meta/conformance/context/context-creation.html.ini
new file mode 100644
index 00000000000..d926d27cf37
--- /dev/null
+++ b/tests/wpt/webgl/meta/conformance/context/context-creation.html.ini
@@ -0,0 +1,2 @@
+[context-creation.html]
+  expected: TIMEOUT
diff --git a/tests/wpt/webgl/meta/conformance/context/premultiplyalpha-test.html.ini b/tests/wpt/webgl/meta/conformance/context/premultiplyalpha-test.html.ini
index 5494eb69348..361c95a0427 100644
--- a/tests/wpt/webgl/meta/conformance/context/premultiplyalpha-test.html.ini
+++ b/tests/wpt/webgl/meta/conformance/context/premultiplyalpha-test.html.ini
@@ -72,3 +72,21 @@
   [WebGL test #12: Unable to fetch WebGL rendering context for Canvas]
     expected: FAIL
 
+  [WebGL test #27: should draw with 64,128,255,128\nat (0, 0) expected: 64,128,255,128 was 0,0,0,255]
+    expected: FAIL
+
+  [WebGL test #20: should draw with 64,128,255,128\nat (0, 0) expected: 64,128,255,128 was 0,0,0,255]
+    expected: FAIL
+
+  [WebGL test #6: should draw with 64,128,255,128\nat (0, 0) expected: 64,128,255,128 was 32,64,128,128]
+    expected: FAIL
+
+  [WebGL test #13: should draw with 64,128,255,128\nat (0, 0) expected: 64,128,255,128 was 32,64,128,128]
+    expected: FAIL
+
+  [WebGL test #48: should draw with 255,192,128,1\nat (0, 0) expected: 255,192,128,1 was 0,0,0,255]
+    expected: FAIL
+
+  [WebGL test #55: should draw with 255,192,128,1\nat (0, 0) expected: 255,192,128,1 was 0,0,0,255]
+    expected: FAIL
+
diff --git a/tests/wpt/webgl/meta/conformance/glsl/bugs/complex-glsl-does-not-crash.html.ini b/tests/wpt/webgl/meta/conformance/glsl/bugs/complex-glsl-does-not-crash.html.ini
new file mode 100644
index 00000000000..67737132496
--- /dev/null
+++ b/tests/wpt/webgl/meta/conformance/glsl/bugs/complex-glsl-does-not-crash.html.ini
@@ -0,0 +1,5 @@
+[complex-glsl-does-not-crash.html]
+  expected: TIMEOUT
+  [Overall test]
+    expected: NOTRUN
+
diff --git a/tests/wpt/webgl/meta/conformance/rendering/multisample-corruption.html.ini b/tests/wpt/webgl/meta/conformance/rendering/multisample-corruption.html.ini
index a9db337a983..2d68d489d35 100644
--- a/tests/wpt/webgl/meta/conformance/rendering/multisample-corruption.html.ini
+++ b/tests/wpt/webgl/meta/conformance/rendering/multisample-corruption.html.ini
@@ -1,5 +1,6 @@
 [multisample-corruption.html]
   bug: https://github.com/servo/servo/issues/21132
+  expected: [OK, TIMEOUT]
   [WebGL test #0: Unable to fetch WebGL rendering context for Canvas]
     expected: FAIL
 
diff --git a/tests/wpt/webgl/meta/conformance/textures/misc/tex-video-using-tex-unit-non-zero.html.ini b/tests/wpt/webgl/meta/conformance/textures/misc/tex-video-using-tex-unit-non-zero.html.ini
index 9b47471145c..34ba40a7d3f 100644
--- a/tests/wpt/webgl/meta/conformance/textures/misc/tex-video-using-tex-unit-non-zero.html.ini
+++ b/tests/wpt/webgl/meta/conformance/textures/misc/tex-video-using-tex-unit-non-zero.html.ini
@@ -1,8 +1,12 @@
 [tex-video-using-tex-unit-non-zero.html]
   bug: https://github.com/servo/servo/issues/21132
+  expected: TIMEOUT
   [WebGL test #0: Unable to fetch WebGL rendering context for Canvas]
     expected: FAIL
 
   [WebGL test #1: context does not exist]
     expected: FAIL
 
+  [Overall test]
+    expected: NOTRUN
+
diff --git a/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-alpha-alpha-unsigned_byte.html.ini b/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-alpha-alpha-unsigned_byte.html.ini
index 12cb8560a34..648a62b052b 100644
--- a/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-alpha-alpha-unsigned_byte.html.ini
+++ b/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-alpha-alpha-unsigned_byte.html.ini
@@ -1,5 +1,6 @@
 [tex-2d-alpha-alpha-unsigned_byte.html]
   bug: https://github.com/servo/servo/issues/21132
+  expected: ERROR
   [WebGL test #0: Unable to fetch WebGL rendering context for Canvas]
     expected: FAIL
 
diff --git a/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-luminance-luminance-unsigned_byte.html.ini b/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-luminance-luminance-unsigned_byte.html.ini
index 8f783ef6cd4..bcc4b6d39de 100644
--- a/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-luminance-luminance-unsigned_byte.html.ini
+++ b/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-luminance-luminance-unsigned_byte.html.ini
@@ -1,8 +1,45 @@
 [tex-2d-luminance-luminance-unsigned_byte.html]
   bug: https://github.com/servo/servo/issues/21132
+  expected: ERROR
   [WebGL test #0: Unable to fetch WebGL rendering context for Canvas]
     expected: FAIL
 
   [WebGL test #1: context does not exist]
     expected: FAIL
 
+  [WebGL test #19: shouldBe 255,255,255\nat (0, 16) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #17: shouldBe 255,255,255\nat (0, 0) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #1: shouldBe 255,255,255\nat (0, 0) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #3: shouldBe 255,255,255\nat (0, 16) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #11: shouldBe 255,255,255\nat (0, 16) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #13: shouldBe 255,255,255\nat (0, 0) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #21: shouldBe 255,255,255\nat (0, 0) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #9: shouldBe 255,255,255\nat (0, 0) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #23: shouldBe 255,255,255\nat (0, 16) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #15: shouldBe 255,255,255\nat (0, 16) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #5: shouldBe 255,255,255\nat (0, 0) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #7: shouldBe 255,255,255\nat (0, 16) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
diff --git a/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-luminance_alpha-luminance_alpha-unsigned_byte.html.ini b/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-luminance_alpha-luminance_alpha-unsigned_byte.html.ini
index 3740984c243..92891b95b3a 100644
--- a/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-luminance_alpha-luminance_alpha-unsigned_byte.html.ini
+++ b/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-luminance_alpha-luminance_alpha-unsigned_byte.html.ini
@@ -1,8 +1,45 @@
 [tex-2d-luminance_alpha-luminance_alpha-unsigned_byte.html]
   bug: https://github.com/servo/servo/issues/21132
+  expected: ERROR
   [WebGL test #0: Unable to fetch WebGL rendering context for Canvas]
     expected: FAIL
 
   [WebGL test #1: context does not exist]
     expected: FAIL
 
+  [WebGL test #19: shouldBe 255,255,255\nat (0, 16) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #17: shouldBe 255,255,255\nat (0, 0) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #1: shouldBe 255,255,255\nat (0, 0) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #3: shouldBe 255,255,255\nat (0, 16) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #11: shouldBe 255,255,255\nat (0, 16) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #13: shouldBe 255,255,255\nat (0, 0) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #21: shouldBe 255,255,255\nat (0, 0) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #9: shouldBe 255,255,255\nat (0, 0) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #23: shouldBe 255,255,255\nat (0, 16) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #15: shouldBe 255,255,255\nat (0, 16) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #5: shouldBe 255,255,255\nat (0, 0) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #7: shouldBe 255,255,255\nat (0, 16) expected: 255,255,255 was 0,0,0]
+    expected: FAIL
+
diff --git a/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgb-rgb-unsigned_byte.html.ini b/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgb-rgb-unsigned_byte.html.ini
index 165188da97a..48a01f62d1f 100644
--- a/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgb-rgb-unsigned_byte.html.ini
+++ b/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgb-rgb-unsigned_byte.html.ini
@@ -1,8 +1,81 @@
 [tex-2d-rgb-rgb-unsigned_byte.html]
   bug: https://github.com/servo/servo/issues/21132
+  expected: ERROR
   [WebGL test #0: Unable to fetch WebGL rendering context for Canvas]
     expected: FAIL
 
   [WebGL test #1: context does not exist]
     expected: FAIL
 
+  [WebGL test #14: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #19: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #6: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #9: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #12: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #20: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #17: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #16: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #7: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #8: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #11: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #22: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #23: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #2: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #18: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #5: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #24: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #1: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #10: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #3: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #15: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #4: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #13: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #21: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
diff --git a/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgb-rgb-unsigned_short_5_6_5.html.ini b/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgb-rgb-unsigned_short_5_6_5.html.ini
index 3a190189844..5950b95f794 100644
--- a/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgb-rgb-unsigned_short_5_6_5.html.ini
+++ b/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgb-rgb-unsigned_short_5_6_5.html.ini
@@ -1,8 +1,81 @@
 [tex-2d-rgb-rgb-unsigned_short_5_6_5.html]
   bug: https://github.com/servo/servo/issues/21132
+  expected: ERROR
   [WebGL test #0: Unable to fetch WebGL rendering context for Canvas]
     expected: FAIL
 
   [WebGL test #1: context does not exist]
     expected: FAIL
 
+  [WebGL test #14: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #19: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #6: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #9: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #12: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #20: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #17: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #16: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #7: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #8: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #11: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #22: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #23: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #2: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #18: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #5: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #24: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #1: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #10: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #3: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #15: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #4: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #13: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #21: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
diff --git a/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgba-rgba-unsigned_byte.html.ini b/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgba-rgba-unsigned_byte.html.ini
index 6ce29315c67..8c91bdbd790 100644
--- a/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgba-rgba-unsigned_byte.html.ini
+++ b/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgba-rgba-unsigned_byte.html.ini
@@ -1,8 +1,81 @@
 [tex-2d-rgba-rgba-unsigned_byte.html]
   bug: https://github.com/servo/servo/issues/21132
+  expected: ERROR
   [WebGL test #0: Unable to fetch WebGL rendering context for Canvas]
     expected: FAIL
 
   [WebGL test #1: context does not exist]
     expected: FAIL
 
+  [WebGL test #14: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #19: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #6: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #9: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #12: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #20: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #17: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #16: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #7: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #8: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #11: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #22: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #23: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #2: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #18: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #5: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #24: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #1: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #10: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #3: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #15: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #4: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #13: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #21: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
diff --git a/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgba-rgba-unsigned_short_4_4_4_4.html.ini b/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgba-rgba-unsigned_short_4_4_4_4.html.ini
index 7e33894a200..49c1d39352e 100644
--- a/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgba-rgba-unsigned_short_4_4_4_4.html.ini
+++ b/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgba-rgba-unsigned_short_4_4_4_4.html.ini
@@ -1,8 +1,81 @@
 [tex-2d-rgba-rgba-unsigned_short_4_4_4_4.html]
   bug: https://github.com/servo/servo/issues/21132
+  expected: ERROR
   [WebGL test #0: Unable to fetch WebGL rendering context for Canvas]
     expected: FAIL
 
   [WebGL test #1: context does not exist]
     expected: FAIL
 
+  [WebGL test #14: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #19: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #6: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #9: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #12: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #20: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #17: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #16: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #7: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #8: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #11: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #22: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #23: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #2: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #18: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #5: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #24: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #1: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #10: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #3: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #15: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #4: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #13: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #21: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
diff --git a/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgba-rgba-unsigned_short_5_5_5_1.html.ini b/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgba-rgba-unsigned_short_5_5_5_1.html.ini
index 40496fcde9c..0b1ca0c6ca2 100644
--- a/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgba-rgba-unsigned_short_5_5_5_1.html.ini
+++ b/tests/wpt/webgl/meta/conformance/textures/webgl_canvas/tex-2d-rgba-rgba-unsigned_short_5_5_5_1.html.ini
@@ -1,8 +1,81 @@
 [tex-2d-rgba-rgba-unsigned_short_5_5_5_1.html]
   bug: https://github.com/servo/servo/issues/21132
+  expected: ERROR
   [WebGL test #0: Unable to fetch WebGL rendering context for Canvas]
     expected: FAIL
 
   [WebGL test #1: context does not exist]
     expected: FAIL
 
+  [WebGL test #14: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #19: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #6: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #9: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #12: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #20: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #17: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #16: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #7: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #8: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #11: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #22: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #23: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #2: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #18: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #5: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #24: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #1: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #10: shouldBe 0,255,0\nat (0, 16) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #3: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #15: shouldBe 255,0,0\nat (0, 16) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #4: shouldBe 0,255,0\nat (0, 0) expected: 0,255,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #13: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
+  [WebGL test #21: shouldBe 255,0,0\nat (0, 0) expected: 255,0,0 was 0,0,0]
+    expected: FAIL
+
diff --git a/tests/wpt/webgl/meta/conformance2/attribs/gl-vertex-attrib-i-render.html.ini b/tests/wpt/webgl/meta/conformance2/attribs/gl-vertex-attrib-i-render.html.ini
index a79c293f5e9..ed32e705993 100644
--- a/tests/wpt/webgl/meta/conformance2/attribs/gl-vertex-attrib-i-render.html.ini
+++ b/tests/wpt/webgl/meta/conformance2/attribs/gl-vertex-attrib-i-render.html.ini
@@ -1,7 +1,11 @@
 [gl-vertex-attrib-i-render.html]
+  expected: ERROR
   [WebGL test #0: Unable to fetch WebGL rendering context for Canvas]
     expected: FAIL
 
   [WebGL test #1: could not create context]
     expected: FAIL
 
+  [WebGL test #0: successfullyParsed should be true (of type boolean). Was undefined (of type undefined).]
+    expected: FAIL
+
diff --git a/tests/wpt/webgl/meta/conformance2/rendering/canvas-resizing-with-pbo-bound.html.ini b/tests/wpt/webgl/meta/conformance2/rendering/canvas-resizing-with-pbo-bound.html.ini
index dddb52a9724..0e7c48f1481 100644
--- a/tests/wpt/webgl/meta/conformance2/rendering/canvas-resizing-with-pbo-bound.html.ini
+++ b/tests/wpt/webgl/meta/conformance2/rendering/canvas-resizing-with-pbo-bound.html.ini
@@ -29,3 +29,51 @@
   [WebGL test #14: Pixel unpack buffer binding was lost]
     expected: FAIL
 
+  [WebGL test #12: Pixel unpack buffer binding was lost]
+    expected: FAIL
+
+  [WebGL test #11: getError expected: NO_ERROR. Was INVALID_ENUM : No GL error]
+    expected: FAIL
+
+  [WebGL test #43: Pixel unpack buffer binding was lost]
+    expected: FAIL
+
+  [WebGL test #42: getError expected: NO_ERROR. Was INVALID_ENUM : No GL error]
+    expected: FAIL
+
+  [WebGL test #30: getError expected: NO_ERROR. Was INVALID_ENUM : No GL error]
+    expected: FAIL
+
+  [WebGL test #5: getError expected: NO_ERROR. Was INVALID_ENUM : No GL error]
+    expected: FAIL
+
+  [WebGL test #48: getError expected: NO_ERROR. Was INVALID_ENUM : No GL error]
+    expected: FAIL
+
+  [WebGL test #36: getError expected: NO_ERROR. Was INVALID_ENUM : No GL error]
+    expected: FAIL
+
+  [WebGL test #24: Pixel unpack buffer binding was lost]
+    expected: FAIL
+
+  [WebGL test #17: getError expected: NO_ERROR. Was INVALID_ENUM : No GL error]
+    expected: FAIL
+
+  [WebGL test #18: Pixel unpack buffer binding was lost]
+    expected: FAIL
+
+  [WebGL test #37: Pixel unpack buffer binding was lost]
+    expected: FAIL
+
+  [WebGL test #6: Pixel unpack buffer binding was lost]
+    expected: FAIL
+
+  [WebGL test #49: Pixel unpack buffer binding was lost]
+    expected: FAIL
+
+  [WebGL test #23: getError expected: NO_ERROR. Was INVALID_ENUM : No GL error]
+    expected: FAIL
+
+  [WebGL test #31: Pixel unpack buffer binding was lost]
+    expected: FAIL
+
diff --git a/tests/wpt/webgl/tests/conformance/rendering/multisample-corruption.html b/tests/wpt/webgl/tests/conformance/rendering/multisample-corruption.html
index 7de9b47f229..db9fb69975d 100644
--- a/tests/wpt/webgl/tests/conformance/rendering/multisample-corruption.html
+++ b/tests/wpt/webgl/tests/conformance/rendering/multisample-corruption.html
@@ -29,6 +29,7 @@
 <html>
 <head>
 <meta charset="utf-8">
+<meta name="timeout" content="long">
 <title>WebGL Multisample Renderbuffer Corruption Test</title>
 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
 <script src=/resources/testharness.js></script>
diff --git a/tests/wpt/webgl/tests/conformance/textures/misc/tex-video-using-tex-unit-non-zero.html b/tests/wpt/webgl/tests/conformance/textures/misc/tex-video-using-tex-unit-non-zero.html
index 9abe3bd7177..288260b019d 100644
--- a/tests/wpt/webgl/tests/conformance/textures/misc/tex-video-using-tex-unit-non-zero.html
+++ b/tests/wpt/webgl/tests/conformance/textures/misc/tex-video-using-tex-unit-non-zero.html
@@ -29,6 +29,7 @@
 <html>
 <head>
 <meta charset="utf-8">
+<meta name="timeout" content="long">
 <title>Texture uploading from video through tex unit 1 bug</title>
 <link rel="stylesheet" href="../../../resources/js-test-style.css"/>
 <script src=/resources/testharness.js></script>