diff --git a/spec/index.bs b/spec/index.bs
index 42b5ce1fa2..6949923315 100644
--- a/spec/index.bs
+++ b/spec/index.bs
@@ -2489,7 +2489,6 @@ offset {{GPUOrigin3D}} in texels, used when copying data from or to a {{GPUTextu
 
   The following validation rules apply:
   - |textureCopyView|.{{GPUTextureCopyView/texture}} must be a [=valid=] {{GPUTexture}}.
-  - The {{GPUTexture/[[sampleCount]]}} of |textureCopyView|.{{GPUTextureCopyView/texture}} must be 1.
   - |textureCopyView|.{{GPUTextureCopyView/mipLevel}} must be less than the {{GPUTexture/[[mipLevelCount]]}} of
     |textureCopyView|.{{GPUTextureCopyView/texture}}.
   - If the |textureCopyView|.{{GPUTextureCopyView/texture}} is {{GPUTextureDimension/1d}} or {{GPUTextureDimension/3d}}:
@@ -2559,9 +2558,30 @@ dictionary GPUImageBitmapCopyView {
 WebGPU provides {{GPUCommandEncoder/copyBufferToTexture()}} for buffer-to-texture copies and
 {{GPUCommandEncoder/copyTextureToBuffer()}} for texture-to-buffer copies.
 
-The following validation rules apply to both {{GPUCommandEncoder/copyBufferToTexture()}}
+The following definitions and validation rules apply to both {{GPUCommandEncoder/copyBufferToTexture()}}
 and {{GPUCommandEncoder/copyTextureToBuffer()}}.
 
+[=textureCopyView subresource size=] and [=Valid Texture Copy Range=] also applies to
+{{GPUCommandEncoder/copyTextureToTexture()}}.
+
+<div algorithm="textureCopyView subresource size">
+
+<dfn dfn>textureCopyView subresource size</dfn>
+
+  **Arguments:**
+    - {{GPUTextureCopyView}} |textureCopyView|
+
+  **Returns:**
+    - {{GPUExtent3D}}
+
+  The [=textureCopyView subresource size=] of |textureCopyView| is calculated as follows:
+
+  Its [=Extent3D/width=], [=Extent3D/height=] and [=Extent3D/depth=] are the width, height, and depth, respectively,
+  of the [=physical size=] of |textureCopyView|.{{GPUTextureCopyView/texture}} [=subresource=] at [=mipmap level=]
+  |textureCopyView|.{{GPUTextureCopyView/mipLevel}}.
+
+</div>
+
 <div algorithm class=validusage>
 
 <dfn dfn>Valid Buffer Copy Range</dfn>
@@ -2598,8 +2618,6 @@ Given a {{GPUBufferCopyView}} |bufferCopyView|, a {{GPUTextureFormat}} |format|
   For the texel block alignments:
   - |bufferCopyView|.{{GPUBufferCopyView/rowsPerImage}} must be a multiple of |blockHeight|.
   - |bufferCopyView|.{{GPUBufferCopyView/offset}} must be a multiple of |blockSize|.
-  - |copySize|.[=Extent3D/width=] must be a multiple of |blockWidth|.
-  - |copySize|.[=Extent3D/height=] must be a multiple of |blockHeight|.
 
   For other members in |bufferCopyView|:
   - If |copySize|.[=Extent3D/height=] is greater than 1:
@@ -2613,17 +2631,20 @@ Given a {{GPUBufferCopyView}} |bufferCopyView|, a {{GPUTextureFormat}} |format|
 
 <dfn dfn>Valid Texture Copy Range</dfn>
 
-Given a {{GPUTextureCopyView}} |textureCopyView| and a {{GPUExtent3D}} |copySize|, the following
-validation rules apply:
+Given a {{GPUTextureCopyView}} |textureCopyView| and a {{GPUExtent3D}} |copySize|, let
+  - |blockWidth| be the [=texel block width=] of |textureCopyView|.{{GPUTextureCopyView/texture}}.{{GPUTexture/[[format]]}}.
+  - |blockHeight| be the [=texel block height=] of |textureCopyView|.{{GPUTextureCopyView/texture}}.{{GPUTexture/[[format]]}}.
+
+The following validation rules apply:
 
   - If the {{GPUTexture/[[dimension]]}} of |textureCopyView|.{{GPUTextureCopyView/texture}} is
     {{GPUTextureDimension/1d}}:
     - Both |copySize|.[=Extent3D/height=] and [=Extent3D/depth=] must be 1.
   - If the {{GPUTexture/[[dimension]]}} of |textureCopyView|.{{GPUTextureCopyView/texture}} is
     {{GPUTextureDimension/2d}}:
-    - (|textureCopyView|.{{GPUTextureCopyView/origin}}.{{GPUOrigin3DDict/x}} + |copySize|.[=Extent3D/width=]) must be less than or equal to the width of the [=physical size=] of |textureCopyView|.{{GPUTextureCopyView/texture}} [=subresource=] at [=mipmap level=] {{GPUTextureCopyView/mipLevel}}.
-    - (|textureCopyView|.{{GPUTextureCopyView/origin}}.{{GPUOrigin3DDict/y}} + |copySize|.[=Extent3D/height=]) must be less than or equal to the height of the [=physical size=] of |textureCopyView|.{{GPUTextureCopyView/texture}} [=subresource=] at [=mipmap level=] {{GPUTextureCopyView/mipLevel}}
-    - (|textureCopyView|.{{GPUTextureCopyView/arrayLayer}} + |copySize|.[=Extent3D/depth=]) must be less than or equal to the depth of the [=Extent3D/depth=] of the |textureCopyView|.{{GPUTextureCopyView/texture}}.
+    - (|textureCopyView|.{{GPUTextureCopyView/origin}}.{{GPUOrigin3DDict/x}} + |copySize|.[=Extent3D/width=]), (|textureCopyView|.{{GPUTextureCopyView/origin}}.{{GPUOrigin3DDict/y}} + |copySize|.[=Extent3D/height=]) and (|textureCopyView|.{{GPUTextureCopyView/arrayLayer}} + |copySize|.[=Extent3D/depth=]) must be less than or equal to the [=Extent3D/width=], [=Extent3D/height=], and [=Extent3D/depth=], respectively, of the [=textureCopyView subresource size=] of |textureCopyView|.
+  - |copySize|.[=Extent3D/width=] must be a multiple of |blockWidth|.
+  - |copySize|.[=Extent3D/height=] must be a multiple of |blockHeight|.
 
 </div>
 
@@ -2676,6 +2697,7 @@ Given a {{GPUCommandEncoder}} |encoder| and the arguments {{GPUBufferCopyView}}
   - |destination| must be [=valid=].
   - |destination|.{{GPUTextureCopyView/texture}}.{{GPUTexture/[[textureUsage]]}} must contain
     {{GPUTextureUsage/COPY_DST}}.
+  - |destination|.{{GPUTextureCopyView/texture}}.{{GPUTexture/[[sampleCount]]}} must be 1.
 
   For the copy ranges:
   - [=Valid Buffer Copy Range=] applies to |source|, |destination|.{{GPUTextureCopyView/texture}}.{{GPUTexture/[[format]]}}
@@ -2721,6 +2743,7 @@ Given a {{GPUCommandEncoder}} |encoder| and the arguments {{GPUTextureCopyView}}
   - |source| must be [=valid=].
   - |source|.{{GPUTextureCopyView/texture}}.{{GPUTexture/[[textureUsage]]}} must contain
     {{GPUTextureUsage/COPY_SRC}}.
+  - |source|.{{GPUTextureCopyView/texture}}.{{GPUTexture/[[sampleCount]]}} must be 1.
 
   For |destination|:
   - |destination| must be [=valid=].
@@ -2733,6 +2756,79 @@ Given a {{GPUCommandEncoder}} |encoder| and the arguments {{GPUTextureCopyView}}
 
 </div>
 
+### <dfn method for=GPUCommandEncoder>copyTextureToTexture(source, destination, copySize)</dfn> ### {#GPUCommandEncoder-copyTextureToTexture}
+
+<div algorithm="GPUCommandEncoder.copyTextureToTexture">
+
+  **Arguments:**
+    - {{GPUTextureCopyView}} |source|
+    - {{GPUTextureCopyView}} |destination|
+    - {{GPUExtent3D}} |copySize|
+
+  **Returns:** void
+
+  Encode a command into the {{GPUCommandEncoder}} that copies data from a sub-region of one
+  or multiple contiguous {{GPUTexture}} [=subresources=] to another sub-region of one or
+  multiple continuous {{GPUTexture}} [=subresources=].
+
+  |source| and |copySize| define the region of the source texture [=subresources=].
+
+  |destination| and |copySize| define the region of the destination texture [=subresources=].
+
+</div>
+
+<div algorithm class=validusage>
+
+<dfn abstract-op>copyTextureToTexture Valid Usage</dfn>
+
+Given a {{GPUCommandEncoder}} |encoder| and the arguments {{GPUTextureCopyView}} |source|,
+{{GPUTextureCopyView}} |destination|, {{GPUExtent3D}} |copySize|, let
+
+  - A |copy of the whole subresource| be the command |encoder|.{{GPUCommandEncoder/copyTextureToTexture()}} whose parameters |source|, |destination| and |copySize| meet the following conditions:
+    - The [=textureCopyView subresource size=] of |source| must be equal to |copySize|.
+    - The [=textureCopyView subresource size=] of |destination| must be equal to |copySize|.
+
+The following validation rules apply:
+
+  For |encoder|:
+  - |encoder|.{{GPUCommandEncoder/copyTextureToTexture()}} must not be called when a {{GPURenderPassEncoder}}
+    is active on |encoder|.
+  - |encoder|.{{GPUCommandEncoder/copyTextureToTexture()}} must not be called when a {{GPUComputePassEncoder}}
+    is active on |encoder|.
+
+  For |source|:
+  - |source| must be [=valid=].
+  - |source|.{{GPUTextureCopyView/texture}}.{{GPUTexture/[[textureUsage]]}} must contain
+    {{GPUTextureUsage/COPY_SRC}}.
+
+  For |destination|:
+  - |destination| must be [=valid=].
+  - |destination|.{{GPUTextureCopyView/texture}}.{{GPUTexture/[[textureUsage]]}} must contain
+    {{GPUTextureUsage/COPY_DST}}.
+
+  For the texture {{GPUTexture/[[sampleCount]]}}:
+  - |source|.{{GPUTextureCopyView/texture}}.{{GPUTexture/[[sampleCount]]}} must be equal to |destination|.
+    {{GPUTextureCopyView/texture}}.{{GPUTexture/[[sampleCount]]}}.
+  - If |source|.{{GPUTextureCopyView/texture}}.{{GPUTexture/[[sampleCount]]}} is greater than 1:
+    - The copy with |source|, |destination| and |copySize| must be a |copy of the whole subresource|.
+
+  For the texture {{GPUTexture/[[format]]}}:
+  - |source|.{{GPUTextureCopyView/texture}}.{{GPUTexture/[[format]]}} must be equal to |destination|.
+    {{GPUTextureCopyView/texture}}.{{GPUTexture/[[format]]}}.
+  - If |source|.{{GPUTextureCopyView/texture}}.{{GPUTexture/[[format]]}} is a depth-stencil format:
+    - The copy with |source|, |destination| and |copySize| must be a |copy of the whole subresource|.
+
+  For the copy ranges:
+  - [=Valid Texture Copy Range=] applies to |source| and |copySize|.
+  - [=Valid Texture Copy Range=] applies to |destination| and |copySize|.
+  - If |source|.{{GPUTextureCopyView/texture}} is the same as |destination|.{{GPUTextureCopyView/texture}}:
+    - The [=subresource=] at [=mipmap level=] |source|.{{GPUTextureCopyView/mipLevel}} and [=array layer=] |source|.{{GPUTextureCopyView/arrayLayer}} must be different from the [=subresource=] at [=mipmap level=] |destination|.{{GPUTextureCopyView/mipLevel}} and [=array layer=] |destination|.{{GPUTextureCopyView/arrayLayer}}.
+
+</dfn>
+
+</div>
+
+
 ## Programmable Passes ## {#programmable-passes}
 
 <script type=idl>