diff --git a/LayoutTests/ChangeLog b/LayoutTests/ChangeLog
index f37568c..1a9350a 100644
--- a/LayoutTests/ChangeLog
+++ b/LayoutTests/ChangeLog
@@ -1,3 +1,16 @@
+2020-08-12  Lauro Moura  <lmoura@igalia.com>
+
+        [GTK][WPE] Rebaseline after new offscreencanvas progress
+
+        Unreviewed test gardening.
+
+        * platform/glib/fast/mediacapturefromelement/CanvasCaptureMediaStream-offscreencanvas-expected.txt: Added.
+        * platform/glib/imported/w3c/web-platform-tests/html/canvas/offscreen/filter/offscreencanvas.filter.w-expected.txt: Added.
+        * platform/glib/imported/w3c/web-platform-tests/html/canvas/offscreen/manual/filter/offscreencanvas.filter.w-expected.txt: Added.
+        * platform/glib/imported/w3c/web-platform-tests/html/dom/idlharness.worker-expected.txt:
+        * platform/gtk/imported/w3c/web-platform-tests/html/dom/idlharness.https-expected.txt:
+        * platform/wpe/imported/w3c/web-platform-tests/html/dom/idlharness.https-expected.txt:
+
 2020-08-12  Youenn Fablet  <youenn@apple.com>
 
         Refresh WritableStream up to spec
diff --git a/LayoutTests/platform/glib/fast/mediacapturefromelement/CanvasCaptureMediaStream-offscreencanvas-expected.txt b/LayoutTests/platform/glib/fast/mediacapturefromelement/CanvasCaptureMediaStream-offscreencanvas-expected.txt
new file mode 100644
index 0000000..15049e4
--- /dev/null
+++ b/LayoutTests/platform/glib/fast/mediacapturefromelement/CanvasCaptureMediaStream-offscreencanvas-expected.txt
@@ -0,0 +1,4 @@
+
+FAIL CanvasCaptureMediaStream-offscreencanvas The MediaRecorder is unsupported on this platform
+FAIL CanvasCaptureMediaStream-offscreencanvas 1 The MediaRecorder is unsupported on this platform
+
diff --git a/LayoutTests/platform/glib/imported/w3c/web-platform-tests/html/canvas/offscreen/filter/offscreencanvas.filter.w-expected.txt b/LayoutTests/platform/glib/imported/w3c/web-platform-tests/html/canvas/offscreen/filter/offscreencanvas.filter.w-expected.txt
new file mode 100644
index 0000000..3c74789
--- /dev/null
+++ b/LayoutTests/platform/glib/imported/w3c/web-platform-tests/html/canvas/offscreen/filter/offscreencanvas.filter.w-expected.txt
@@ -0,0 +1,3 @@
+
+PASS offscreencanvas 
+
diff --git a/LayoutTests/platform/glib/imported/w3c/web-platform-tests/html/canvas/offscreen/manual/filter/offscreencanvas.filter.w-expected.txt b/LayoutTests/platform/glib/imported/w3c/web-platform-tests/html/canvas/offscreen/manual/filter/offscreencanvas.filter.w-expected.txt
new file mode 100644
index 0000000..3c74789
--- /dev/null
+++ b/LayoutTests/platform/glib/imported/w3c/web-platform-tests/html/canvas/offscreen/manual/filter/offscreencanvas.filter.w-expected.txt
@@ -0,0 +1,3 @@
+
+PASS offscreencanvas 
+
diff --git a/LayoutTests/platform/glib/imported/w3c/web-platform-tests/html/dom/idlharness.worker-expected.txt b/LayoutTests/platform/glib/imported/w3c/web-platform-tests/html/dom/idlharness.worker-expected.txt
index 5c5f2c0..674f264 100644
--- a/LayoutTests/platform/glib/imported/w3c/web-platform-tests/html/dom/idlharness.worker-expected.txt
+++ b/LayoutTests/platform/glib/imported/w3c/web-platform-tests/html/dom/idlharness.worker-expected.txt
@@ -324,83 +324,83 @@
 PASS OffscreenCanvas interface: operation getContext(OffscreenRenderingContextId, optional any) 
 PASS OffscreenCanvas interface: operation transferToImageBitmap() 
 PASS OffscreenCanvas interface: operation convertToBlob(optional ImageEncodeOptions) 
-FAIL OffscreenCanvasRenderingContext2D interface: existence and properties of interface object assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface object length assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface object name assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: existence and properties of interface prototype object assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: existence and properties of interface prototype object's "constructor" property assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: existence and properties of interface prototype object's @@unscopables property assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation commit() assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute canvas assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation save() assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation restore() assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation scale(unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation rotate(unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation translate(unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation transform(unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation getTransform() assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation setTransform(unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation setTransform(optional DOMMatrix2DInit) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation resetTransform() assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute globalAlpha assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute globalCompositeOperation assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute imageSmoothingEnabled assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute imageSmoothingQuality assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute strokeStyle assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute fillStyle assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation createLinearGradient(double, double, double, double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation createRadialGradient(double, double, double, double, double, double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation createPattern(CanvasImageSource, DOMString) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute shadowOffsetX assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute shadowOffsetY assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute shadowBlur assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute shadowColor assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute filter assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation clearRect(unrestricted double, unrestricted double, unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation fillRect(unrestricted double, unrestricted double, unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation strokeRect(unrestricted double, unrestricted double, unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation beginPath() assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation fill(optional CanvasFillRule) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation fill(Path2D, optional CanvasFillRule) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation stroke() assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation stroke(Path2D) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation clip(optional CanvasFillRule) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation clip(Path2D, optional CanvasFillRule) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation isPointInPath(unrestricted double, unrestricted double, optional CanvasFillRule) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation isPointInPath(Path2D, unrestricted double, unrestricted double, optional CanvasFillRule) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation isPointInStroke(unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation isPointInStroke(Path2D, unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation fillText(DOMString, unrestricted double, unrestricted double, optional unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation strokeText(DOMString, unrestricted double, unrestricted double, optional unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation measureText(DOMString) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation drawImage(CanvasImageSource, unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation drawImage(CanvasImageSource, unrestricted double, unrestricted double, unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation drawImage(CanvasImageSource, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation createImageData(long, long) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation createImageData(ImageData) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation getImageData(long, long, long, long) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation putImageData(ImageData, long, long) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation putImageData(ImageData, long, long, long, long, long, long) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute lineWidth assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute lineCap assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute lineJoin assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute miterLimit assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation setLineDash(sequence<unrestricted double>) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation getLineDash() assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute lineDashOffset assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute font assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute textAlign assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute textBaseline assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: attribute direction assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation closePath() assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation moveTo(unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation lineTo(unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation quadraticCurveTo(unrestricted double, unrestricted double, unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation bezierCurveTo(unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation arcTo(unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation rect(unrestricted double, unrestricted double, unrestricted double, unrestricted double) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation arc(unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, optional boolean) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
-FAIL OffscreenCanvasRenderingContext2D interface: operation ellipse(unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, optional boolean) assert_own_property: self does not have own property "OffscreenCanvasRenderingContext2D" expected property "OffscreenCanvasRenderingContext2D" missing
+PASS OffscreenCanvasRenderingContext2D interface: existence and properties of interface object 
+PASS OffscreenCanvasRenderingContext2D interface object length 
+PASS OffscreenCanvasRenderingContext2D interface object name 
+PASS OffscreenCanvasRenderingContext2D interface: existence and properties of interface prototype object 
+PASS OffscreenCanvasRenderingContext2D interface: existence and properties of interface prototype object's "constructor" property 
+PASS OffscreenCanvasRenderingContext2D interface: existence and properties of interface prototype object's @@unscopables property 
+PASS OffscreenCanvasRenderingContext2D interface: operation commit() 
+PASS OffscreenCanvasRenderingContext2D interface: attribute canvas 
+PASS OffscreenCanvasRenderingContext2D interface: operation save() 
+PASS OffscreenCanvasRenderingContext2D interface: operation restore() 
+PASS OffscreenCanvasRenderingContext2D interface: operation scale(unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation rotate(unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation translate(unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation transform(unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation getTransform() 
+PASS OffscreenCanvasRenderingContext2D interface: operation setTransform(unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation setTransform(optional DOMMatrix2DInit) 
+PASS OffscreenCanvasRenderingContext2D interface: operation resetTransform() 
+PASS OffscreenCanvasRenderingContext2D interface: attribute globalAlpha 
+PASS OffscreenCanvasRenderingContext2D interface: attribute globalCompositeOperation 
+PASS OffscreenCanvasRenderingContext2D interface: attribute imageSmoothingEnabled 
+PASS OffscreenCanvasRenderingContext2D interface: attribute imageSmoothingQuality 
+PASS OffscreenCanvasRenderingContext2D interface: attribute strokeStyle 
+PASS OffscreenCanvasRenderingContext2D interface: attribute fillStyle 
+PASS OffscreenCanvasRenderingContext2D interface: operation createLinearGradient(double, double, double, double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation createRadialGradient(double, double, double, double, double, double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation createPattern(CanvasImageSource, DOMString) 
+PASS OffscreenCanvasRenderingContext2D interface: attribute shadowOffsetX 
+PASS OffscreenCanvasRenderingContext2D interface: attribute shadowOffsetY 
+PASS OffscreenCanvasRenderingContext2D interface: attribute shadowBlur 
+PASS OffscreenCanvasRenderingContext2D interface: attribute shadowColor 
+FAIL OffscreenCanvasRenderingContext2D interface: attribute filter assert_true: The prototype object must have a property "filter" expected true got false
+PASS OffscreenCanvasRenderingContext2D interface: operation clearRect(unrestricted double, unrestricted double, unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation fillRect(unrestricted double, unrestricted double, unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation strokeRect(unrestricted double, unrestricted double, unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation beginPath() 
+PASS OffscreenCanvasRenderingContext2D interface: operation fill(optional CanvasFillRule) 
+PASS OffscreenCanvasRenderingContext2D interface: operation fill(Path2D, optional CanvasFillRule) 
+PASS OffscreenCanvasRenderingContext2D interface: operation stroke() 
+PASS OffscreenCanvasRenderingContext2D interface: operation stroke(Path2D) 
+PASS OffscreenCanvasRenderingContext2D interface: operation clip(optional CanvasFillRule) 
+PASS OffscreenCanvasRenderingContext2D interface: operation clip(Path2D, optional CanvasFillRule) 
+PASS OffscreenCanvasRenderingContext2D interface: operation isPointInPath(unrestricted double, unrestricted double, optional CanvasFillRule) 
+PASS OffscreenCanvasRenderingContext2D interface: operation isPointInPath(Path2D, unrestricted double, unrestricted double, optional CanvasFillRule) 
+PASS OffscreenCanvasRenderingContext2D interface: operation isPointInStroke(unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation isPointInStroke(Path2D, unrestricted double, unrestricted double) 
+FAIL OffscreenCanvasRenderingContext2D interface: operation fillText(DOMString, unrestricted double, unrestricted double, optional unrestricted double) assert_own_property: interface prototype object missing non-static operation expected property "fillText" missing
+FAIL OffscreenCanvasRenderingContext2D interface: operation strokeText(DOMString, unrestricted double, unrestricted double, optional unrestricted double) assert_own_property: interface prototype object missing non-static operation expected property "strokeText" missing
+FAIL OffscreenCanvasRenderingContext2D interface: operation measureText(DOMString) assert_own_property: interface prototype object missing non-static operation expected property "measureText" missing
+PASS OffscreenCanvasRenderingContext2D interface: operation drawImage(CanvasImageSource, unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation drawImage(CanvasImageSource, unrestricted double, unrestricted double, unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation drawImage(CanvasImageSource, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation createImageData(long, long) 
+PASS OffscreenCanvasRenderingContext2D interface: operation createImageData(ImageData) 
+PASS OffscreenCanvasRenderingContext2D interface: operation getImageData(long, long, long, long) 
+PASS OffscreenCanvasRenderingContext2D interface: operation putImageData(ImageData, long, long) 
+PASS OffscreenCanvasRenderingContext2D interface: operation putImageData(ImageData, long, long, long, long, long, long) 
+PASS OffscreenCanvasRenderingContext2D interface: attribute lineWidth 
+PASS OffscreenCanvasRenderingContext2D interface: attribute lineCap 
+PASS OffscreenCanvasRenderingContext2D interface: attribute lineJoin 
+PASS OffscreenCanvasRenderingContext2D interface: attribute miterLimit 
+PASS OffscreenCanvasRenderingContext2D interface: operation setLineDash(sequence<unrestricted double>) 
+PASS OffscreenCanvasRenderingContext2D interface: operation getLineDash() 
+PASS OffscreenCanvasRenderingContext2D interface: attribute lineDashOffset 
+FAIL OffscreenCanvasRenderingContext2D interface: attribute font assert_true: The prototype object must have a property "font" expected true got false
+FAIL OffscreenCanvasRenderingContext2D interface: attribute textAlign assert_true: The prototype object must have a property "textAlign" expected true got false
+FAIL OffscreenCanvasRenderingContext2D interface: attribute textBaseline assert_true: The prototype object must have a property "textBaseline" expected true got false
+FAIL OffscreenCanvasRenderingContext2D interface: attribute direction assert_true: The prototype object must have a property "direction" expected true got false
+PASS OffscreenCanvasRenderingContext2D interface: operation closePath() 
+PASS OffscreenCanvasRenderingContext2D interface: operation moveTo(unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation lineTo(unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation quadraticCurveTo(unrestricted double, unrestricted double, unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation bezierCurveTo(unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation arcTo(unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation rect(unrestricted double, unrestricted double, unrestricted double, unrestricted double) 
+PASS OffscreenCanvasRenderingContext2D interface: operation arc(unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, optional boolean) 
+PASS OffscreenCanvasRenderingContext2D interface: operation ellipse(unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, optional boolean) 
 PASS CustomElementRegistry interface: existence and properties of interface object 
 PASS ElementInternals interface: existence and properties of interface object 
 PASS DataTransfer interface: existence and properties of interface object 
diff --git a/LayoutTests/platform/gtk/imported/w3c/web-platform-tests/html/dom/idlharness.https-expected.txt b/LayoutTests/platform/gtk/imported/w3c/web-platform-tests/html/dom/idlharness.https-expected.txt
index 30c32cd..ccabcce 100644
--- a/LayoutTests/platform/gtk/imported/w3c/web-platform-tests/html/dom/idlharness.https-expected.txt
+++ b/LayoutTests/platform/gtk/imported/w3c/web-platform-tests/html/dom/idlharness.https-expected.txt
@@ -3851,7 +3851,7 @@
 PASS HTMLCanvasElement interface: operation getContext(DOMString, optional any) 
 PASS HTMLCanvasElement interface: operation toDataURL(optional DOMString, optional any) 
 PASS HTMLCanvasElement interface: operation toBlob(BlobCallback, optional DOMString, optional any) 
-FAIL HTMLCanvasElement interface: operation transferControlToOffscreen() assert_own_property: interface prototype object missing non-static operation expected property "transferControlToOffscreen" missing
+PASS HTMLCanvasElement interface: operation transferControlToOffscreen() 
 PASS HTMLCanvasElement must be primary interface of document.createElement("canvas") 
 PASS Stringification of document.createElement("canvas") 
 PASS HTMLCanvasElement interface: document.createElement("canvas") must inherit property "width" with the proper type 
@@ -3862,7 +3862,7 @@
 PASS HTMLCanvasElement interface: calling toDataURL(optional DOMString, optional any) on document.createElement("canvas") with too few arguments must throw TypeError 
 PASS HTMLCanvasElement interface: document.createElement("canvas") must inherit property "toBlob(BlobCallback, optional DOMString, optional any)" with the proper type 
 PASS HTMLCanvasElement interface: calling toBlob(BlobCallback, optional DOMString, optional any) on document.createElement("canvas") with too few arguments must throw TypeError 
-FAIL HTMLCanvasElement interface: document.createElement("canvas") must inherit property "transferControlToOffscreen()" with the proper type assert_inherits: property "transferControlToOffscreen" not found in prototype chain
+PASS HTMLCanvasElement interface: document.createElement("canvas") must inherit property "transferControlToOffscreen()" with the proper type 
 PASS CanvasRenderingContext2D interface: existence and properties of interface object 
 PASS CanvasRenderingContext2D interface object length 
 PASS CanvasRenderingContext2D interface object name 
@@ -4152,7 +4152,7 @@
 PASS OffscreenCanvasRenderingContext2D interface: existence and properties of interface prototype object 
 PASS OffscreenCanvasRenderingContext2D interface: existence and properties of interface prototype object's "constructor" property 
 PASS OffscreenCanvasRenderingContext2D interface: existence and properties of interface prototype object's @@unscopables property 
-FAIL OffscreenCanvasRenderingContext2D interface: operation commit() assert_own_property: interface prototype object missing non-static operation expected property "commit" missing
+PASS OffscreenCanvasRenderingContext2D interface: operation commit() 
 PASS OffscreenCanvasRenderingContext2D interface: attribute canvas 
 PASS OffscreenCanvasRenderingContext2D interface: operation save() 
 PASS OffscreenCanvasRenderingContext2D interface: operation restore() 
diff --git a/LayoutTests/platform/wpe/imported/w3c/web-platform-tests/html/dom/idlharness.https-expected.txt b/LayoutTests/platform/wpe/imported/w3c/web-platform-tests/html/dom/idlharness.https-expected.txt
index 63d1d22..fec95ce 100644
--- a/LayoutTests/platform/wpe/imported/w3c/web-platform-tests/html/dom/idlharness.https-expected.txt
+++ b/LayoutTests/platform/wpe/imported/w3c/web-platform-tests/html/dom/idlharness.https-expected.txt
@@ -3851,7 +3851,7 @@
 PASS HTMLCanvasElement interface: operation getContext(DOMString, optional any) 
 PASS HTMLCanvasElement interface: operation toDataURL(optional DOMString, optional any) 
 PASS HTMLCanvasElement interface: operation toBlob(BlobCallback, optional DOMString, optional any) 
-FAIL HTMLCanvasElement interface: operation transferControlToOffscreen() assert_own_property: interface prototype object missing non-static operation expected property "transferControlToOffscreen" missing
+PASS HTMLCanvasElement interface: operation transferControlToOffscreen() 
 PASS HTMLCanvasElement must be primary interface of document.createElement("canvas") 
 PASS Stringification of document.createElement("canvas") 
 PASS HTMLCanvasElement interface: document.createElement("canvas") must inherit property "width" with the proper type 
@@ -3862,7 +3862,7 @@
 PASS HTMLCanvasElement interface: calling toDataURL(optional DOMString, optional any) on document.createElement("canvas") with too few arguments must throw TypeError 
 PASS HTMLCanvasElement interface: document.createElement("canvas") must inherit property "toBlob(BlobCallback, optional DOMString, optional any)" with the proper type 
 PASS HTMLCanvasElement interface: calling toBlob(BlobCallback, optional DOMString, optional any) on document.createElement("canvas") with too few arguments must throw TypeError 
-FAIL HTMLCanvasElement interface: document.createElement("canvas") must inherit property "transferControlToOffscreen()" with the proper type assert_inherits: property "transferControlToOffscreen" not found in prototype chain
+PASS HTMLCanvasElement interface: document.createElement("canvas") must inherit property "transferControlToOffscreen()" with the proper type 
 PASS CanvasRenderingContext2D interface: existence and properties of interface object 
 PASS CanvasRenderingContext2D interface object length 
 PASS CanvasRenderingContext2D interface object name 
@@ -4152,7 +4152,7 @@
 PASS OffscreenCanvasRenderingContext2D interface: existence and properties of interface prototype object 
 PASS OffscreenCanvasRenderingContext2D interface: existence and properties of interface prototype object's "constructor" property 
 PASS OffscreenCanvasRenderingContext2D interface: existence and properties of interface prototype object's @@unscopables property 
-FAIL OffscreenCanvasRenderingContext2D interface: operation commit() assert_own_property: interface prototype object missing non-static operation expected property "commit" missing
+PASS OffscreenCanvasRenderingContext2D interface: operation commit() 
 PASS OffscreenCanvasRenderingContext2D interface: attribute canvas 
 PASS OffscreenCanvasRenderingContext2D interface: operation save() 
 PASS OffscreenCanvasRenderingContext2D interface: operation restore()