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diff --git a/dom/webidl/WebGPU.webidl b/dom/webidl/WebGPU.webidl
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+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://gpuweb.github.io/gpuweb/
+ */
+
+
+
+typedef [EnforceRange] unsigned long GPUBufferDynamicOffset;
+typedef [EnforceRange] unsigned long long GPUFenceValue;
+typedef [EnforceRange] unsigned long GPUStencilValue;
+typedef [EnforceRange] unsigned long GPUSampleMask;
+typedef [EnforceRange] long GPUDepthBias;
+
+typedef [EnforceRange] unsigned long long GPUSize64;
+typedef [EnforceRange] unsigned long GPUIntegerCoordinate;
+typedef [EnforceRange] unsigned long GPUIndex32;
+typedef [EnforceRange] unsigned long GPUSize32;
+typedef [EnforceRange] long GPUSignedOffset32;
+
+dictionary GPUColorDict {
+    required double r;
+    required double g;
+    required double b;
+    required double a;
+};
+
+dictionary GPUOrigin2DDict {
+    GPUIntegerCoordinate x = 0;
+    GPUIntegerCoordinate y = 0;
+};
+
+dictionary GPUOrigin3DDict {
+    GPUIntegerCoordinate x = 0;
+    GPUIntegerCoordinate y = 0;
+    GPUIntegerCoordinate z = 0;
+};
+
+dictionary GPUExtent3DDict {
+    required GPUIntegerCoordinate width;
+    required GPUIntegerCoordinate height;
+    required GPUIntegerCoordinate depth;
+};
+
+typedef (sequence<double> or GPUColorDict) GPUColor;
+typedef (sequence<GPUIntegerCoordinate> or GPUOrigin2DDict) GPUOrigin2D;
+typedef (sequence<GPUIntegerCoordinate> or GPUOrigin3DDict) GPUOrigin3D;
+typedef (sequence<GPUIntegerCoordinate> or GPUExtent3DDict) GPUExtent3D;
+
+interface mixin GPUObjectBase {
+    attribute DOMString? label;
+};
+
+dictionary GPUObjectDescriptorBase {
+    DOMString? label;
+};
+
+// ****************************************************************************
+// INITIALIZATION
+// ****************************************************************************
+
+[
+    Pref="dom.webgpu.enabled",
+    Exposed=Window
+]
+interface GPU {
+    // May reject with DOMException
+    [NewObject]
+    Promise<GPUAdapter> requestAdapter(optional GPURequestAdapterOptions options = {});
+};
+
+// Add a "webgpu" member to Navigator/Worker that contains the global instance of a "WebGPU"
+interface mixin GPUProvider {
+    [SameObject, Replaceable, Pref="dom.webgpu.enabled", Exposed=Window] readonly attribute GPU gpu;
+};
+
+enum GPUPowerPreference {
+    "low-power",
+    "high-performance"
+};
+
+dictionary GPURequestAdapterOptions {
+    GPUPowerPreference powerPreference;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUAdapter {
+    readonly attribute DOMString name;
+    //GPUExtensions getExtensions();
+    //readonly attribute GPULimits limits; Don't expose higher limits for now.
+
+    // May reject with DOMException
+    [NewObject]
+    Promise<GPUDevice> requestDevice(optional GPUDeviceDescriptor descriptor = {});
+};
+GPUAdapter includes GPUObjectBase;
+
+dictionary GPUExtensions {
+};
+
+dictionary GPULimits {
+    GPUSize32 maxBindGroups = 4;
+    GPUSize32 maxDynamicUniformBuffersPerPipelineLayout = 8;
+    GPUSize32 maxDynamicStorageBuffersPerPipelineLayout = 4;
+    GPUSize32 maxSampledTexturesPerShaderStage = 16;
+    GPUSize32 maxSamplersPerShaderStage = 16;
+    GPUSize32 maxStorageBuffersPerShaderStage = 4;
+    GPUSize32 maxStorageTexturesPerShaderStage = 4;
+    GPUSize32 maxUniformBuffersPerShaderStage = 12;
+    GPUSize32 maxUniformBufferBindingSize = 16384;
+};
+
+// Device
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUDevice {
+    //GPUExtensions getExtensions();
+    //GPULimits getLimits();
+    //readonly attribute GPUAdapter adapter;
+
+    [SameObject] readonly attribute GPUQueue defaultQueue;
+
+    [NewObject, Throws]
+    GPUBuffer createBuffer(GPUBufferDescriptor descriptor);
+    [NewObject]
+    GPUTexture createTexture(GPUTextureDescriptor descriptor);
+    [NewObject]
+    GPUSampler createSampler(optional GPUSamplerDescriptor descriptor = {});
+
+    GPUBindGroupLayout createBindGroupLayout(GPUBindGroupLayoutDescriptor descriptor);
+    GPUPipelineLayout createPipelineLayout(GPUPipelineLayoutDescriptor descriptor);
+    GPUBindGroup createBindGroup(GPUBindGroupDescriptor descriptor);
+
+    GPUShaderModule createShaderModule(GPUShaderModuleDescriptor descriptor);
+    GPUComputePipeline createComputePipeline(GPUComputePipelineDescriptor descriptor);
+    GPURenderPipeline createRenderPipeline(GPURenderPipelineDescriptor descriptor);
+
+    [NewObject]
+    GPUCommandEncoder createCommandEncoder(optional GPUCommandEncoderDescriptor descriptor = {});
+    //GPURenderBundleEncoder createRenderBundleEncoder(GPURenderBundleEncoderDescriptor descriptor);
+};
+GPUDevice includes GPUObjectBase;
+
+dictionary GPUDeviceDescriptor {
+    GPUExtensions extensions;
+    GPULimits limits;
+
+    // TODO are other things configurable like queues?
+};
+
+
+// ****************************************************************************
+// ERROR HANDLING
+// ****************************************************************************
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUDeviceLostInfo {
+    readonly attribute DOMString message;
+};
+
+enum GPUErrorFilter {
+    "none",
+    "out-of-memory",
+    "validation"
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUOutOfMemoryError {
+    //constructor();
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUValidationError {
+    constructor(DOMString message);
+    readonly attribute DOMString message;
+};
+
+typedef (GPUOutOfMemoryError or GPUValidationError) GPUError;
+
+partial interface GPUDevice {
+    //readonly attribute Promise<GPUDeviceLostInfo> lost;
+    //void pushErrorScope(GPUErrorFilter filter);
+    //Promise<GPUError?> popErrorScope();
+    [Exposed=Window]
+    attribute EventHandler onuncapturederror;
+};
+
+// ****************************************************************************
+// SHADER RESOURCES (buffer, textures, texture views, samples)
+// ****************************************************************************
+
+// Buffer
+typedef unsigned long GPUBufferUsageFlags;
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUBufferUsage {
+    const GPUBufferUsageFlags MAP_READ      = 0x0001;
+    const GPUBufferUsageFlags MAP_WRITE     = 0x0002;
+    const GPUBufferUsageFlags COPY_SRC      = 0x0004;
+    const GPUBufferUsageFlags COPY_DST      = 0x0008;
+    const GPUBufferUsageFlags INDEX         = 0x0010;
+    const GPUBufferUsageFlags VERTEX        = 0x0020;
+    const GPUBufferUsageFlags UNIFORM       = 0x0040;
+    const GPUBufferUsageFlags STORAGE       = 0x0080;
+    const GPUBufferUsageFlags INDIRECT      = 0x0100;
+    const GPUBufferUsageFlags QUERY_RESOLVE = 0x0200;
+};
+
+dictionary GPUBufferDescriptor : GPUObjectDescriptorBase {
+    required GPUSize64 size;
+    required GPUBufferUsageFlags usage;
+    boolean mappedAtCreation = false;
+};
+
+typedef unsigned long GPUMapModeFlags;
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUMapMode
+ {
+    const GPUMapModeFlags READ  = 0x0001;
+    const GPUMapModeFlags WRITE = 0x0002;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUBuffer {
+    [NewObject]
+    Promise<void> mapAsync(GPUMapModeFlags mode, optional GPUSize64 offset = 0, optional GPUSize64 size);
+    [NewObject, Throws]
+    ArrayBuffer getMappedRange(optional GPUSize64 offset = 0, optional GPUSize64 size);
+    [Throws]
+    void unmap();
+
+    void destroy();
+};
+GPUBuffer includes GPUObjectBase;
+
+typedef sequence<any> GPUMappedBuffer;
+
+// Texture
+enum GPUTextureDimension {
+    "1d",
+    "2d",
+    "3d",
+};
+
+enum GPUTextureFormat {
+    // 8-bit formats
+    "r8unorm",
+    "r8snorm",
+    "r8uint",
+    "r8sint",
+
+    // 16-bit formats
+    "r16uint",
+    "r16sint",
+    "r16float",
+    "rg8unorm",
+    "rg8snorm",
+    "rg8uint",
+    "rg8sint",
+
+    // 32-bit formats
+    "r32uint",
+    "r32sint",
+    "r32float",
+    "rg16uint",
+    "rg16sint",
+    "rg16float",
+    "rgba8unorm",
+    "rgba8unorm-srgb",
+    "rgba8snorm",
+    "rgba8uint",
+    "rgba8sint",
+    "bgra8unorm",
+    "bgra8unorm-srgb",
+    // Packed 32-bit formats
+    "rgb10a2unorm",
+    "rg11b10float",
+
+    // 64-bit formats
+    "rg32uint",
+    "rg32sint",
+    "rg32float",
+    "rgba16uint",
+    "rgba16sint",
+    "rgba16float",
+
+    // 128-bit formats
+    "rgba32uint",
+    "rgba32sint",
+    "rgba32float",
+
+    // Depth and stencil formats
+    "depth32float",
+    "depth24plus",
+    "depth24plus-stencil8"
+};
+
+typedef unsigned long GPUTextureUsageFlags;
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUTextureUsage {
+    const GPUTextureUsageFlags COPY_SRC          = 0x01;
+    const GPUTextureUsageFlags COPY_DST          = 0x02;
+    const GPUTextureUsageFlags SAMPLED           = 0x04;
+    const GPUTextureUsageFlags STORAGE           = 0x08;
+    const GPUTextureUsageFlags OUTPUT_ATTACHMENT = 0x10;
+};
+
+dictionary GPUTextureDescriptor : GPUObjectDescriptorBase {
+    required GPUExtent3D size;
+    GPUIntegerCoordinate mipLevelCount = 1;
+    GPUSize32 sampleCount = 1;
+    GPUTextureDimension dimension = "2d";
+    required GPUTextureFormat format;
+    required GPUTextureUsageFlags usage;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUTexture {
+    [NewObject]
+    GPUTextureView createView(optional GPUTextureViewDescriptor descriptor = {});
+
+    void destroy();
+};
+GPUTexture includes GPUObjectBase;
+
+// Texture view
+enum GPUTextureViewDimension {
+    "1d",
+    "2d",
+    "2d-array",
+    "cube",
+    "cube-array",
+    "3d"
+};
+
+enum GPUTextureAspect {
+    "all",
+    "stencil-only",
+    "depth-only"
+};
+
+dictionary GPUTextureViewDescriptor : GPUObjectDescriptorBase {
+    GPUTextureFormat format;
+    GPUTextureViewDimension dimension;
+    GPUTextureAspect aspect = "all";
+    GPUIntegerCoordinate baseMipLevel = 0;
+    GPUIntegerCoordinate mipLevelCount;
+    GPUIntegerCoordinate baseArrayLayer = 0;
+    GPUIntegerCoordinate arrayLayerCount;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUTextureView {
+};
+GPUTextureView includes GPUObjectBase;
+
+// Sampler
+enum GPUAddressMode {
+    "clamp-to-edge",
+    "repeat",
+    "mirror-repeat"
+};
+
+enum GPUFilterMode {
+    "nearest",
+    "linear",
+};
+
+enum GPUCompareFunction {
+    "never",
+    "less",
+    "equal",
+    "less-equal",
+    "greater",
+    "not-equal",
+    "greater-equal",
+    "always"
+};
+
+dictionary GPUSamplerDescriptor : GPUObjectDescriptorBase {
+    GPUAddressMode addressModeU = "clamp-to-edge";
+    GPUAddressMode addressModeV = "clamp-to-edge";
+    GPUAddressMode addressModeW = "clamp-to-edge";
+    GPUFilterMode magFilter = "nearest";
+    GPUFilterMode minFilter = "nearest";
+    GPUFilterMode mipmapFilter = "nearest";
+    float lodMinClamp = 0;
+    float lodMaxClamp = 1000.0; //TODO?
+    GPUCompareFunction compare;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUSampler {
+};
+GPUSampler includes GPUObjectBase;
+
+enum GPUTextureComponentType {
+    "float",
+    "sint",
+    "uint",
+    "depth-comparison"
+};
+
+// ****************************************************************************
+// BINDING MODEL (bindgroup layout, bindgroup)
+// ****************************************************************************
+
+// PipelineLayout
+dictionary GPUPipelineLayoutDescriptor : GPUObjectDescriptorBase {
+    required sequence<GPUBindGroupLayout> bindGroupLayouts;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUPipelineLayout {
+};
+GPUPipelineLayout includes GPUObjectBase;
+
+// BindGroupLayout
+typedef unsigned long GPUShaderStageFlags;
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUShaderStage {
+    const GPUShaderStageFlags VERTEX = 1;
+    const GPUShaderStageFlags FRAGMENT = 2;
+    const GPUShaderStageFlags COMPUTE = 4;
+};
+
+enum GPUBindingType {
+    "uniform-buffer",
+    "storage-buffer",
+    "readonly-storage-buffer",
+    "sampler",
+    "comparison-sampler",
+    "sampled-texture",
+    "readonly-storage-texture",
+    "writeonly-storage-texture",
+};
+
+dictionary GPUBindGroupLayoutEntry {
+    required GPUIndex32 binding;
+    required GPUShaderStageFlags visibility;
+    required GPUBindingType type;
+    GPUTextureViewDimension viewDimension;
+    GPUTextureComponentType textureComponentType;
+    boolean multisampled = false;
+    boolean hasDynamicOffset = false;
+    GPUTextureFormat storageTextureFormat;
+};
+
+dictionary GPUBindGroupLayoutDescriptor : GPUObjectDescriptorBase {
+    required sequence<GPUBindGroupLayoutEntry> entries;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUBindGroupLayout {
+};
+GPUBindGroupLayout includes GPUObjectBase;
+
+// BindGroup
+dictionary GPUBufferBinding {
+    required GPUBuffer buffer;
+    GPUSize64 offset = 0;
+    GPUSize64 size;
+};
+
+typedef (GPUSampler or GPUTextureView or GPUBufferBinding) GPUBindingResource;
+
+dictionary GPUBindGroupEntry {
+    required GPUIndex32 binding;
+    required GPUBindingResource resource;
+};
+
+dictionary GPUBindGroupDescriptor : GPUObjectDescriptorBase {
+    required GPUBindGroupLayout layout;
+    required sequence<GPUBindGroupEntry> entries;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUBindGroup {
+};
+GPUBindGroup includes GPUObjectBase;
+
+// ****************************************************************************
+// PIPELINE CREATION (blend state, DS state, ..., pipelines)
+// ****************************************************************************
+
+// BlendState
+enum GPUBlendFactor {
+    "zero",
+    "one",
+    "src-color",
+    "one-minus-src-color",
+    "src-alpha",
+    "one-minus-src-alpha",
+    "dst-color",
+    "one-minus-dst-color",
+    "dst-alpha",
+    "one-minus-dst-alpha",
+    "src-alpha-saturated",
+    "blend-color",
+    "one-minus-blend-color",
+};
+
+enum GPUBlendOperation {
+    "add",
+    "subtract",
+    "reverse-subtract",
+    "min",
+    "max"
+};
+
+dictionary GPUBlendDescriptor {
+    GPUBlendFactor srcFactor = "one";
+    GPUBlendFactor dstFactor = "zero";
+    GPUBlendOperation operation = "add";
+};
+
+typedef unsigned long GPUColorWriteFlags;
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUColorWrite {
+    const GPUColorWriteFlags RED    = 0x1;
+    const GPUColorWriteFlags GREEN  = 0x2;
+    const GPUColorWriteFlags BLUE   = 0x4;
+    const GPUColorWriteFlags ALPHA  = 0x8;
+    const GPUColorWriteFlags ALL    = 0xF;
+};
+
+dictionary GPUColorStateDescriptor {
+    required GPUTextureFormat format;
+
+    GPUBlendDescriptor alphaBlend = {};
+    GPUBlendDescriptor colorBlend = {};
+    GPUColorWriteFlags writeMask = 0xF;
+};
+
+// DepthStencilState
+enum GPUStencilOperation {
+    "keep",
+    "zero",
+    "replace",
+    "invert",
+    "increment-clamp",
+    "decrement-clamp",
+    "increment-wrap",
+    "decrement-wrap"
+};
+
+dictionary GPUStencilStateFaceDescriptor {
+    GPUCompareFunction compare = "always";
+    GPUStencilOperation failOp = "keep";
+    GPUStencilOperation depthFailOp = "keep";
+    GPUStencilOperation passOp = "keep";
+};
+
+dictionary GPUDepthStencilStateDescriptor {
+    required GPUTextureFormat format;
+
+    boolean depthWriteEnabled = false;
+    GPUCompareFunction depthCompare = "always";
+
+    GPUStencilStateFaceDescriptor stencilFront = {};
+    GPUStencilStateFaceDescriptor stencilBack = {};
+
+    GPUStencilValue stencilReadMask = 0xFFFFFFFF;
+    GPUStencilValue stencilWriteMask = 0xFFFFFFFF;
+};
+
+// InputState
+enum GPUIndexFormat {
+    "uint16",
+    "uint32",
+};
+
+enum GPUVertexFormat {
+    "uchar2",
+    "uchar4",
+    "char2",
+    "char4",
+    "uchar2norm",
+    "uchar4norm",
+    "char2norm",
+    "char4norm",
+    "ushort2",
+    "ushort4",
+    "short2",
+    "short4",
+    "ushort2norm",
+    "ushort4norm",
+    "short2norm",
+    "short4norm",
+    "half2",
+    "half4",
+    "float",
+    "float2",
+    "float3",
+    "float4",
+    "uint",
+    "uint2",
+    "uint3",
+    "uint4",
+    "int",
+    "int2",
+    "int3",
+    "int4",
+};
+
+enum GPUInputStepMode {
+    "vertex",
+    "instance",
+};
+
+dictionary GPUVertexAttributeDescriptor {
+    required GPUVertexFormat format;
+    required GPUSize64 offset;
+    required GPUIndex32 shaderLocation;
+};
+
+dictionary GPUVertexBufferLayoutDescriptor {
+    required GPUSize64 arrayStride;
+    GPUInputStepMode stepMode = "vertex";
+    required sequence<GPUVertexAttributeDescriptor> attributes;
+};
+
+dictionary GPUVertexStateDescriptor {
+    GPUIndexFormat indexFormat = "uint32";
+    sequence<GPUVertexBufferLayoutDescriptor?> vertexBuffers = [];
+};
+
+// ShaderModule
+typedef (Uint32Array or DOMString) GPUShaderCode;
+
+dictionary GPUShaderModuleDescriptor : GPUObjectDescriptorBase {
+    required GPUShaderCode code;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUShaderModule {
+};
+GPUShaderModule includes GPUObjectBase;
+
+// Common stuff for ComputePipeline and RenderPipeline
+dictionary GPUPipelineDescriptorBase : GPUObjectDescriptorBase {
+    GPUPipelineLayout layout;
+};
+
+interface mixin GPUPipelineBase {
+    GPUBindGroupLayout getBindGroupLayout(unsigned long index);
+};
+
+dictionary GPUProgrammableStageDescriptor {
+    required GPUShaderModule module;
+    required DOMString entryPoint;
+};
+
+// ComputePipeline
+dictionary GPUComputePipelineDescriptor : GPUPipelineDescriptorBase {
+    required GPUProgrammableStageDescriptor computeStage;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUComputePipeline {
+};
+GPUComputePipeline includes GPUObjectBase;
+GPUComputePipeline includes GPUPipelineBase;
+
+// GPURenderPipeline
+enum GPUPrimitiveTopology {
+    "point-list",
+    "line-list",
+    "line-strip",
+    "triangle-list",
+    "triangle-strip"
+};
+
+dictionary GPURasterizationStateDescriptor {
+    GPUFrontFace frontFace = "ccw";
+    GPUCullMode cullMode = "none";
+
+    GPUDepthBias depthBias = 0;
+    float depthBiasSlopeScale = 0;
+    float depthBiasClamp = 0;
+};
+
+enum GPUFrontFace {
+    "ccw",
+    "cw"
+};
+
+enum GPUCullMode {
+    "none",
+    "front",
+    "back"
+};
+
+dictionary GPURenderPipelineDescriptor : GPUPipelineDescriptorBase {
+    required GPUProgrammableStageDescriptor vertexStage;
+    GPUProgrammableStageDescriptor fragmentStage;
+
+    required GPUPrimitiveTopology primitiveTopology;
+    GPURasterizationStateDescriptor rasterizationState = {};
+    required sequence<GPUColorStateDescriptor> colorStates;
+    GPUDepthStencilStateDescriptor depthStencilState;
+    GPUVertexStateDescriptor vertexState = {};
+
+    GPUSize32 sampleCount = 1;
+    GPUSampleMask sampleMask = 0xFFFFFFFF;
+    boolean alphaToCoverageEnabled = false;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPURenderPipeline {
+};
+GPURenderPipeline includes GPUObjectBase;
+GPURenderPipeline includes GPUPipelineBase;
+
+// ****************************************************************************
+// COMMAND RECORDING (Command buffer and all relevant structures)
+// ****************************************************************************
+
+enum GPULoadOp {
+    "load"
+};
+
+enum GPUStoreOp {
+    "store",
+    "clear"
+};
+
+dictionary GPURenderPassColorAttachmentDescriptor {
+    required GPUTextureView attachment;
+    GPUTextureView resolveTarget;
+
+    required (GPULoadOp or GPUColor) loadValue;
+    GPUStoreOp storeOp = "store";
+};
+
+dictionary GPURenderPassDepthStencilAttachmentDescriptor {
+    required GPUTextureView attachment;
+
+    required (GPULoadOp or float) depthLoadValue;
+    required GPUStoreOp depthStoreOp;
+
+    required (GPULoadOp or GPUStencilValue) stencilLoadValue;
+    required GPUStoreOp stencilStoreOp;
+};
+
+dictionary GPURenderPassDescriptor : GPUObjectDescriptorBase {
+    required sequence<GPURenderPassColorAttachmentDescriptor> colorAttachments;
+    GPURenderPassDepthStencilAttachmentDescriptor depthStencilAttachment;
+};
+
+dictionary GPUTextureDataLayout {
+    GPUSize64 offset = 0;
+    required GPUSize32 bytesPerRow;
+    GPUSize32 rowsPerImage = 0;
+};
+
+dictionary GPUBufferCopyView : GPUTextureDataLayout {
+    required GPUBuffer buffer;
+};
+
+dictionary GPUTextureCopyView {
+    required GPUTexture texture;
+    GPUIntegerCoordinate mipLevel = 0;
+    GPUOrigin3D origin;
+};
+
+dictionary GPUImageBitmapCopyView {
+    //required ImageBitmap imageBitmap; //TODO
+    GPUOrigin2D origin;
+};
+
+dictionary GPUCommandEncoderDescriptor : GPUObjectDescriptorBase {
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUCommandEncoder {
+    [NewObject]
+    GPUComputePassEncoder beginComputePass(optional GPUComputePassDescriptor descriptor = {});
+    [NewObject]
+    GPURenderPassEncoder beginRenderPass(GPURenderPassDescriptor descriptor);
+
+    void copyBufferToBuffer(
+        GPUBuffer source,
+        GPUSize64 sourceOffset,
+        GPUBuffer destination,
+        GPUSize64 destinationOffset,
+        GPUSize64 size);
+
+    void copyBufferToTexture(
+        GPUBufferCopyView source,
+        GPUTextureCopyView destination,
+        GPUExtent3D copySize);
+
+    void copyTextureToBuffer(
+        GPUTextureCopyView source,
+        GPUBufferCopyView destination,
+        GPUExtent3D copySize);
+
+    void copyTextureToTexture(
+        GPUTextureCopyView source,
+        GPUTextureCopyView destination,
+        GPUExtent3D copySize);
+
+    /*
+    void copyImageBitmapToTexture(
+        GPUImageBitmapCopyView source,
+        GPUTextureCopyView destination,
+        GPUExtent3D copySize);
+    */
+
+    //void pushDebugGroup(DOMString groupLabel);
+    //void popDebugGroup();
+    //void insertDebugMarker(DOMString markerLabel);
+
+    [NewObject]
+    GPUCommandBuffer finish(optional GPUCommandBufferDescriptor descriptor = {});
+};
+GPUCommandEncoder includes GPUObjectBase;
+
+interface mixin GPUProgrammablePassEncoder {
+    void setBindGroup(GPUIndex32 index, GPUBindGroup bindGroup,
+                      optional sequence<GPUBufferDynamicOffset> dynamicOffsets = []);
+
+    //void pushDebugGroup(DOMString groupLabel);
+    //void popDebugGroup();
+    //void insertDebugMarker(DOMString markerLabel);
+};
+
+// Render Pass
+interface mixin GPURenderEncoderBase {
+    void setPipeline(GPURenderPipeline pipeline);
+
+    void setIndexBuffer(GPUBuffer buffer, optional GPUSize64 offset = 0, optional GPUSize64 size = 0);
+    void setVertexBuffer(GPUIndex32 slot, GPUBuffer buffer, optional GPUSize64 offset = 0, optional GPUSize64 size = 0);
+
+    void draw(GPUSize32 vertexCount,
+              optional GPUSize32 instanceCount = 1,
+              optional GPUSize32 firstVertex = 0,
+              optional GPUSize32 firstInstance = 0);
+    void drawIndexed(GPUSize32 indexCount,
+                     optional GPUSize32 instanceCount = 1,
+                     optional GPUSize32 firstIndex = 0,
+                     optional GPUSignedOffset32 baseVertex = 0,
+                     optional GPUSize32 firstInstance = 0);
+
+    void drawIndirect(GPUBuffer indirectBuffer, GPUSize64 indirectOffset);
+    void drawIndexedIndirect(GPUBuffer indirectBuffer, GPUSize64 indirectOffset);
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPURenderPassEncoder {
+    //void setViewport(float x, float y,
+    //                 float width, float height,
+    //                 float minDepth, float maxDepth);
+
+    //void setScissorRect(u32 x, u32 y, u32 width, u32 height);
+
+    //void setBlendColor(GPUColor color);
+    //void setStencilReference(u32 reference);
+
+    //void executeBundles(sequence<GPURenderBundle> bundles);
+    [Throws]
+    void endPass();
+};
+GPURenderPassEncoder includes GPUObjectBase;
+GPURenderPassEncoder includes GPUProgrammablePassEncoder;
+GPURenderPassEncoder includes GPURenderEncoderBase;
+
+// Compute Pass
+dictionary GPUComputePassDescriptor : GPUObjectDescriptorBase {
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUComputePassEncoder {
+    void setPipeline(GPUComputePipeline pipeline);
+    void dispatch(GPUSize32 x, optional GPUSize32 y = 1, optional GPUSize32 z = 1);
+    void dispatchIndirect(GPUBuffer indirectBuffer, GPUSize64 indirectOffset);
+
+    [Throws]
+    void endPass();
+};
+GPUComputePassEncoder includes GPUObjectBase;
+GPUComputePassEncoder includes GPUProgrammablePassEncoder;
+
+// Command Buffer
+dictionary GPUCommandBufferDescriptor : GPUObjectDescriptorBase {
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUCommandBuffer {
+};
+GPUCommandBuffer includes GPUObjectBase;
+
+dictionary GPURenderBundleEncoderDescriptor : GPUObjectDescriptorBase {
+    required sequence<GPUTextureFormat> colorFormats;
+    GPUTextureFormat depthStencilFormat;
+    GPUSize32 sampleCount = 1;
+};
+
+// Render Bundle
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPURenderBundleEncoder {
+    //GPURenderBundle finish(optional GPURenderBundleDescriptor descriptor = {});
+};
+GPURenderBundleEncoder includes GPUObjectBase;
+//GPURenderBundleEncoder includes GPURenderEncoderBase;
+
+dictionary GPURenderBundleDescriptor : GPUObjectDescriptorBase {
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPURenderBundle {
+};
+GPURenderBundle includes GPUObjectBase;
+
+// ****************************************************************************
+// OTHER (Fence, Queue SwapChain, Device)
+// ****************************************************************************
+
+// Fence
+dictionary GPUFenceDescriptor : GPUObjectDescriptorBase {
+    GPUFenceValue initialValue = 0;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUFence {
+    //GPUFenceValue getCompletedValue();
+    //Promise<void> onCompletion(GPUFenceValue completionValue);
+};
+GPUFence includes GPUObjectBase;
+
+// Queue
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUQueue {
+    void submit(sequence<GPUCommandBuffer> buffers);
+
+    //GPUFence createFence(optional GPUFenceDescriptor descriptor = {});
+    //void signal(GPUFence fence, GPUFenceValue signalValue);
+
+    [Throws]
+    void writeBuffer(
+        GPUBuffer buffer,
+        GPUSize64 bufferOffset,
+        [AllowShared] ArrayBuffer data,
+        optional GPUSize64 dataOffset = 0,
+        optional GPUSize64 size);
+
+    [Throws]
+    void writeTexture(
+      GPUTextureCopyView destination,
+      [AllowShared] ArrayBuffer data,
+      GPUTextureDataLayout dataLayout,
+      GPUExtent3D size);
+};
+GPUQueue includes GPUObjectBase;
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUSwapChain {
+    GPUTexture getCurrentTexture();
+};
+GPUSwapChain includes GPUObjectBase;
+
+dictionary GPUSwapChainDescriptor : GPUObjectDescriptorBase {
+    required GPUDevice device;
+    required GPUTextureFormat format;
+    GPUTextureUsageFlags usage = 0x10; //GPUTextureUsage.OUTPUT_ATTACHMENT
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=Window]
+interface GPUCanvasContext {
+    // Calling configureSwapChain a second time invalidates the previous one,
+    // and all of the textures it's produced.
+    [Throws]
+    GPUSwapChain configureSwapChain(GPUSwapChainDescriptor descriptor);
+
+    //Promise<GPUTextureFormat> getSwapChainPreferredFormat(GPUDevice device);
+};