diff --git a/ext/webgpu/wrap/adapter.rs b/ext/webgpu/wrap/adapter.rs
index a314c8854e..fc73b1e8cf 100644
--- a/ext/webgpu/wrap/adapter.rs
+++ b/ext/webgpu/wrap/adapter.rs
@@ -10,6 +10,7 @@ use deno_core::GarbageCollected;
 use deno_core::WebIDL;
 
 use super::device::GPUDevice;
+use crate::wrap::webidl::features_to_feature_names;
 use crate::Instance;
 
 #[derive(WebIDL)]
@@ -67,6 +68,7 @@ impl GPUAdapter {
   fn features(&self, scope: &mut v8::HandleScope) -> v8::Global<v8::Object> {
     self.features.get(scope, || {
       let features = self.instance.adapter_features(self.id);
+      let features = features_to_feature_names(features);
 
       /*
       function createGPUSupportedFeatures(features) {
@@ -106,8 +108,7 @@ impl GPUAdapter {
     #[webidl] descriptor: GPUDeviceDescriptor,
   ) -> Result<GPUDevice, CreateDeviceError> {
     let features = self.instance.adapter_features(self.id);
-    let supported_features =
-      crate::wrap::webidl::features_to_feature_names(&features);
+    let supported_features = features_to_feature_names(features);
     let required_features = descriptor
       .required_features
       .iter()
@@ -150,10 +151,11 @@ impl GPUAdapter {
       queue,
       label: descriptor.label,
       queue_obj: SameObject::new(),
-      info: self.info.clone(),
+      adapter_info: self.info.clone(),
       error_handler: Arc::new(super::error::DeviceErrorHandler::new(sender)),
       adapter: self.id,
       lost_receiver: receiver,
+      limits: SameObject::new(),
     })
   }
 }
@@ -171,7 +173,7 @@ pub enum CreateDeviceError {
   Device(#[from] wgpu_core::instance::RequestDeviceError),
 }
 
-pub struct GPUSupportedLimits(wgpu_types::Limits);
+pub struct GPUSupportedLimits(pub wgpu_types::Limits);
 
 impl GarbageCollected for GPUSupportedLimits {}
 
diff --git a/ext/webgpu/wrap/buffer.rs b/ext/webgpu/wrap/buffer.rs
index 41abf33ead..ed470e1688 100644
--- a/ext/webgpu/wrap/buffer.rs
+++ b/ext/webgpu/wrap/buffer.rs
@@ -37,6 +37,9 @@ pub enum BufferError {
   #[class("DOMExceptionOperationError")]
   #[error(transparent)]
   Access(#[from] wgpu_core::resource::BufferAccessError),
+  #[class(inherit)]
+  #[error(transparent)]
+  Other(#[from] JsErrorBox),
 }
 
 pub struct GPUBuffer {
@@ -178,7 +181,13 @@ impl GPUBuffer {
 
       if err.is_some() {
         self.error_handler.push_error(err);
-        // TODO: throw new DOMException("validation error occurred", "OperationError");
+        return Err(
+          JsErrorBox::new(
+            "DOMExceptionOperationError",
+            "validation error occurred",
+          )
+          .into(),
+        );
       }
     }
 
@@ -231,7 +240,7 @@ impl GPUBuffer {
     let ab = v8::ArrayBuffer::new(scope, slice.len());
     v8::Uint8Array::new(scope, ab, 0, slice.len());
 
-    // TODO: sure buf
+    // TODO: store buf
     self
       .mapped_js_buffers
       .borrow_mut()
diff --git a/ext/webgpu/wrap/command_encoder.rs b/ext/webgpu/wrap/command_encoder.rs
index c8e1163853..b3d02d1c2b 100644
--- a/ext/webgpu/wrap/command_encoder.rs
+++ b/ext/webgpu/wrap/command_encoder.rs
@@ -7,6 +7,7 @@ use deno_core::cppgc::Ptr;
 use deno_core::op2;
 use deno_core::GarbageCollected;
 use deno_core::WebIDL;
+use deno_error::JsErrorBox;
 use wgpu_core::command::ImageCopyBuffer;
 use wgpu_core::command::PassChannel;
 
@@ -39,7 +40,7 @@ impl GPUCommandEncoder {
   fn begin_render_pass(
     &self,
     #[webidl] descriptor: crate::wrap::render_pass::GPURenderPassDescriptor,
-  ) -> GPURenderPassEncoder {
+  ) -> Result<GPURenderPassEncoder, JsErrorBox> {
     let color_attachments = Cow::Owned(
       descriptor
         .color_attachments
@@ -66,9 +67,11 @@ impl GPUCommandEncoder {
 
     let depth_stencil_attachment =
       descriptor.depth_stencil_attachment.map(|attachment| {
-        // TODO: `depthLoadOp` is cheked to ensure its value is not "clear"
-        //   when `depthClearValue` is undefined, so the default 0.0 doesn't matter.
-        wgpu_core::command::RenderPassDepthStencilAttachment {
+        if attachment.depth_load_op.as_ref().is_some_and(|op| matches!(op, GPULoadOp::Clear)) && attachment.depth_clear_value.is_none() {
+          return Err(JsErrorBox::type_error(r#"'depthClearValue' must be specified when 'depthLoadOp' is "clear""#));
+        }
+
+        Ok(wgpu_core::command::RenderPassDepthStencilAttachment {
           view: attachment.view.id,
           depth: PassChannel {
             load_op: attachment.depth_load_op.unwrap_or(GPULoadOp::Load).into(),
@@ -91,8 +94,8 @@ impl GPUCommandEncoder {
             clear_value: attachment.stencil_clear_value,
             read_only: false,
           },
-        }
-      });
+        })
+      }).transpose()?;
 
     let timestamp_writes =
       descriptor.timestamp_writes.map(|timestamp_writes| {
@@ -120,12 +123,12 @@ impl GPUCommandEncoder {
 
     self.error_handler.push_error(err);
 
-    GPURenderPassEncoder {
+    Ok(GPURenderPassEncoder {
       instance: self.instance.clone(),
       error_handler: self.error_handler.clone(),
       render_pass: RefCell::new(render_pass),
       label: descriptor.label,
-    }
+    })
   }
 
   #[cppgc]
diff --git a/ext/webgpu/wrap/compute_pass.rs b/ext/webgpu/wrap/compute_pass.rs
index 520ac4af75..5990f09023 100644
--- a/ext/webgpu/wrap/compute_pass.rs
+++ b/ext/webgpu/wrap/compute_pass.rs
@@ -9,6 +9,7 @@ use deno_core::v8;
 use deno_core::webidl::IntOptions;
 use deno_core::webidl::Nullable;
 use deno_core::webidl::WebIdlConverter;
+use deno_core::webidl::WebIdlError;
 use deno_core::GarbageCollected;
 use deno_core::WebIDL;
 
@@ -128,7 +129,7 @@ impl GPUComputePassEncoder {
     dynamic_offsets: v8::Local<'a, v8::Value>,
     dynamic_offsets_data_start: v8::Local<'a, v8::Value>,
     dynamic_offsets_data_length: v8::Local<'a, v8::Value>,
-  ) {
+  ) -> Result<(), WebIdlError> {
     const PREFIX: &str =
       "Failed to execute 'setBindGroup' on 'GPUComputePassEncoder'";
     let offsets =
@@ -142,8 +143,7 @@ impl GPUComputePassEncoder {
             clamp: false,
             enforce_range: true,
           },
-        )
-        .unwrap(); // TODO: dont unwrap err
+        )?;
         let len = u32::convert(
           scope,
           dynamic_offsets,
@@ -153,8 +153,7 @@ impl GPUComputePassEncoder {
             clamp: false,
             enforce_range: true,
           },
-        )
-        .unwrap(); // TODO: dont unwrap err
+        )?;
 
         // TODO
 
@@ -169,8 +168,7 @@ impl GPUComputePassEncoder {
             clamp: false,
             enforce_range: true,
           },
-        )
-        .unwrap() // TODO: dont unwrap err
+        )?
         .unwrap_or_default()
       };
 
@@ -185,6 +183,8 @@ impl GPUComputePassEncoder {
       .err();
 
     self.error_handler.push_error(err);
+
+    Ok(())
   }
 }
 
diff --git a/ext/webgpu/wrap/device.rs b/ext/webgpu/wrap/device.rs
index bd0f15f4bd..483977258a 100644
--- a/ext/webgpu/wrap/device.rs
+++ b/ext/webgpu/wrap/device.rs
@@ -23,6 +23,7 @@ use super::sampler::GPUSampler;
 use super::shader::GPUShaderModule;
 use super::texture::GPUTexture;
 use crate::wrap::adapter::GPUAdapterInfo;
+use crate::wrap::adapter::GPUSupportedLimits;
 use crate::wrap::command_encoder::GPUCommandEncoder;
 use crate::wrap::query_set::GPUQuerySet;
 use crate::wrap::render_bundle::GPURenderBundleEncoder;
@@ -37,10 +38,11 @@ pub struct GPUDevice {
 
   pub label: String,
 
-  //TODO: pub features: SameObject<()>,
-  //TODO: pub limits: SameObject<()>,
+  pub features: SameObject<GPUDevice>,
+  pub limits: SameObject<GPUSupportedLimits>,
+  pub adapter_info: Arc<SameObject<GPUAdapterInfo>>,
+
   pub queue_obj: SameObject<GPUQueue>,
-  pub info: Arc<SameObject<GPUAdapterInfo>>,
 
   pub error_handler: super::error::ErrorHandler,
   pub lost_receiver: tokio::sync::oneshot::Receiver<()>,
@@ -60,8 +62,12 @@ impl GPUDevice {
   }
 
   #[getter]
-  fn limits(&self) {
-    todo!()
+  #[global]
+  fn limits(&self, scope: &mut v8::HandleScope) -> v8::Global<v8::Object> {
+    self.limits.get(scope, || {
+      let adapter_limits = self.instance.device_limits(self.id);
+      GPUSupportedLimits(adapter_limits)
+    })
   }
 
   #[getter]
@@ -70,7 +76,7 @@ impl GPUDevice {
     &self,
     scope: &mut v8::HandleScope,
   ) -> v8::Global<v8::Object> {
-    self.info.get(scope, || {
+    self.adapter_info.get(scope, || {
       let info = self.instance.adapter_get_info(self.adapter);
       GPUAdapterInfo(info)
     })
diff --git a/ext/webgpu/wrap/render_bundle.rs b/ext/webgpu/wrap/render_bundle.rs
index 9f8e976436..1a10f36077 100644
--- a/ext/webgpu/wrap/render_bundle.rs
+++ b/ext/webgpu/wrap/render_bundle.rs
@@ -10,9 +10,11 @@ use deno_core::v8;
 use deno_core::webidl::IntOptions;
 use deno_core::webidl::Nullable;
 use deno_core::webidl::WebIdlConverter;
+use deno_core::webidl::WebIdlError;
 use deno_core::webidl::WebIdlInterfaceConverter;
 use deno_core::GarbageCollected;
 use deno_core::WebIDL;
+use deno_error::JsErrorBox;
 
 use crate::wrap::buffer::GPUBuffer;
 use crate::wrap::texture::GPUTextureFormat;
@@ -22,7 +24,7 @@ pub struct GPURenderBundleEncoder {
   pub instance: Instance,
   pub error_handler: super::error::ErrorHandler,
 
-  pub encoder: RefCell<wgpu_core::command::RenderBundleEncoder>,
+  pub encoder: RefCell<Option<wgpu_core::command::RenderBundleEncoder>>,
   pub label: String,
 }
 
@@ -42,7 +44,7 @@ impl GPURenderBundleEncoder {
     };
 
     let (id, err) = self.instance.render_bundle_encoder_finish(
-      self.encoder.into_inner(), // TODO
+      self.encoder.borrow_mut().take().unwrap(),
       &wgpu_descriptor,
       None,
     );
@@ -55,32 +57,54 @@ impl GPURenderBundleEncoder {
     }
   }
 
-  fn push_debug_group(&self, #[webidl] group_label: String) {
+  fn push_debug_group(
+    &self,
+    #[webidl] group_label: String,
+  ) -> Result<(), JsErrorBox> {
+    let mut encoder = self.encoder.borrow_mut();
+    let encoder = encoder.as_mut().ok_or_else(|| {
+      JsErrorBox::generic("Encoder has already been finished")
+    })?;
+
     let label = std::ffi::CString::new(group_label).unwrap();
     unsafe {
       wgpu_core::command::bundle_ffi::wgpu_render_bundle_push_debug_group(
-        &mut self.encoder.borrow_mut(),
+        encoder,
         label.as_ptr(),
       );
     }
+
+    Ok(())
   }
 
   #[fast]
-  fn pop_debug_group(&self) {
-    wgpu_core::command::bundle_ffi::wgpu_render_bundle_pop_debug_group(
-      &mut self.encoder.borrow_mut(),
-    );
+  fn pop_debug_group(&self) -> Result<(), JsErrorBox> {
+    let mut encoder = self.encoder.borrow_mut();
+    let encoder = encoder.as_mut().ok_or_else(|| {
+      JsErrorBox::generic("Encoder has already been finished")
+    })?;
+    wgpu_core::command::bundle_ffi::wgpu_render_bundle_pop_debug_group(encoder);
+    Ok(())
   }
 
-  fn insert_debug_marker(&self, #[webidl] marker_label: String) {
+  fn insert_debug_marker(
+    &self,
+    #[webidl] marker_label: String,
+  ) -> Result<(), JsErrorBox> {
+    let mut encoder = self.encoder.borrow_mut();
+    let encoder = encoder.as_mut().ok_or_else(|| {
+      JsErrorBox::generic("Encoder has already been finished")
+    })?;
+
     let label = std::ffi::CString::new(marker_label).unwrap();
 
     unsafe {
       wgpu_core::command::bundle_ffi::wgpu_render_bundle_insert_debug_marker(
-        &mut self.encoder.borrow_mut(),
+        encoder,
         label.as_ptr(),
       );
     }
+    Ok(())
   }
 
   fn set_bind_group<'a>(
@@ -91,7 +115,7 @@ impl GPURenderBundleEncoder {
     dynamic_offsets: v8::Local<'a, v8::Value>,
     dynamic_offsets_data_start: v8::Local<'a, v8::Value>,
     dynamic_offsets_data_length: v8::Local<'a, v8::Value>,
-  ) {
+  ) -> Result<(), SetBindGroupError> {
     const PREFIX: &str =
       "Failed to execute 'setBindGroup' on 'GPUComputePassEncoder'";
     let offsets =
@@ -105,8 +129,7 @@ impl GPURenderBundleEncoder {
             clamp: false,
             enforce_range: true,
           },
-        )
-        .unwrap(); // TODO: dont unwrap err
+        )?;
         let len = u32::convert(
           scope,
           dynamic_offsets,
@@ -116,8 +139,7 @@ impl GPURenderBundleEncoder {
             clamp: false,
             enforce_range: true,
           },
-        )
-        .unwrap(); // TODO: dont unwrap err
+        )?;
 
         // TODO
 
@@ -132,30 +154,41 @@ impl GPURenderBundleEncoder {
             clamp: false,
             enforce_range: true,
           },
-        )
-        .unwrap() // TODO: dont unwrap err
+        )?
         .unwrap_or_default()
       };
 
+    let mut encoder = self.encoder.borrow_mut();
+    let encoder = encoder.as_mut().ok_or_else(|| {
+      JsErrorBox::generic("Encoder has already been finished")
+    })?;
+
     unsafe {
       wgpu_core::command::bundle_ffi::wgpu_render_bundle_set_bind_group(
-        &mut self.encoder.borrow_mut(),
+        encoder,
         index,
         bind_group.into_option().map(|bind_group| bind_group.id),
         offsets.as_ptr(),
         offsets.len(),
       );
     }
+    Ok(())
   }
 
   fn set_pipeline(
     &self,
     #[webidl] pipeline: Ptr<crate::wrap::render_pipeline::GPURenderPipeline>,
-  ) {
+  ) -> Result<(), JsErrorBox> {
+    let mut encoder = self.encoder.borrow_mut();
+    let encoder = encoder.as_mut().ok_or_else(|| {
+      JsErrorBox::generic("Encoder has already been finished")
+    })?;
+
     wgpu_core::command::bundle_ffi::wgpu_render_bundle_set_pipeline(
-      &mut self.encoder.borrow_mut(),
+      encoder,
       pipeline.id,
     );
+    Ok(())
   }
 
   #[required(2)]
@@ -165,13 +198,19 @@ impl GPURenderBundleEncoder {
     #[webidl] index_format: crate::wrap::render_pipeline::GPUIndexFormat,
     #[webidl/*(default = 0, options(enforce_range = true))*/] offset: u64,
     #[webidl/*(options(enforce_range = true))*/] size: Option<u64>,
-  ) {
-    self.encoder.borrow_mut().set_index_buffer(
+  ) -> Result<(), JsErrorBox> {
+    let mut encoder = self.encoder.borrow_mut();
+    let encoder = encoder.as_mut().ok_or_else(|| {
+      JsErrorBox::generic("Encoder has already been finished")
+    })?;
+
+    encoder.set_index_buffer(
       buffer.id,
       index_format.into(),
       offset,
       size.and_then(NonZeroU64::new),
     );
+    Ok(())
   }
 
   #[required(2)]
@@ -181,14 +220,20 @@ impl GPURenderBundleEncoder {
     #[webidl] buffer: Ptr<GPUBuffer>, // TODO: support nullable buffer
     #[webidl/*(default = 0, options(enforce_range = true))*/] offset: u64,
     #[webidl/*(options(enforce_range = true))*/] size: Option<u64>,
-  ) {
+  ) -> Result<(), JsErrorBox> {
+    let mut encoder = self.encoder.borrow_mut();
+    let encoder = encoder.as_mut().ok_or_else(|| {
+      JsErrorBox::generic("Encoder has already been finished")
+    })?;
+
     wgpu_core::command::bundle_ffi::wgpu_render_bundle_set_vertex_buffer(
-      &mut self.encoder.borrow_mut(),
+      encoder,
       slot,
       buffer.id,
       offset,
       size.and_then(NonZeroU64::new),
     );
+    Ok(())
   }
 
   #[required(1)]
@@ -200,14 +245,20 @@ impl GPURenderBundleEncoder {
     #[webidl/*(default = 0, options(enforce_range = true))*/] first_vertex: u32,
     #[webidl/*(default = 0, options(enforce_range = true))*/]
     first_instance: u32,
-  ) {
+  ) -> Result<(), JsErrorBox> {
+    let mut encoder = self.encoder.borrow_mut();
+    let encoder = encoder.as_mut().ok_or_else(|| {
+      JsErrorBox::generic("Encoder has already been finished")
+    })?;
+
     wgpu_core::command::bundle_ffi::wgpu_render_bundle_draw(
-      &mut self.encoder.borrow_mut(),
+      encoder,
       vertex_count,
       instance_count,
       first_vertex,
       first_instance,
     );
+    Ok(())
   }
 
   #[required(1)]
@@ -220,15 +271,21 @@ impl GPURenderBundleEncoder {
     #[webidl/*(default = 0, options(enforce_range = true))*/] base_vertex: i32,
     #[webidl/*(default = 0, options(enforce_range = true))*/]
     first_instance: u32,
-  ) {
+  ) -> Result<(), JsErrorBox> {
+    let mut encoder = self.encoder.borrow_mut();
+    let encoder = encoder.as_mut().ok_or_else(|| {
+      JsErrorBox::generic("Encoder has already been finished")
+    })?;
+
     wgpu_core::command::bundle_ffi::wgpu_render_bundle_draw_indexed(
-      &mut self.encoder.borrow_mut(),
+      encoder,
       index_count,
       instance_count,
       first_index,
       base_vertex,
       first_instance,
     );
+    Ok(())
   }
 
   #[required(2)]
@@ -236,12 +293,18 @@ impl GPURenderBundleEncoder {
     &self,
     #[webidl] indirect_buffer: Ptr<GPUBuffer>,
     #[webidl/*(options(enforce_range = true))*/] indirect_offset: u64,
-  ) {
+  ) -> Result<(), JsErrorBox> {
+    let mut encoder = self.encoder.borrow_mut();
+    let encoder = encoder.as_mut().ok_or_else(|| {
+      JsErrorBox::generic("Encoder has already been finished")
+    })?;
+
     wgpu_core::command::bundle_ffi::wgpu_render_bundle_draw_indirect(
-      &mut self.encoder.borrow_mut(),
+      encoder,
       indirect_buffer.id,
       indirect_offset,
     );
+    Ok(())
   }
 
   #[required(2)]
@@ -249,12 +312,18 @@ impl GPURenderBundleEncoder {
     &self,
     #[webidl] indirect_buffer: Ptr<GPUBuffer>,
     #[webidl/*(options(enforce_range = true))*/] indirect_offset: u64,
-  ) {
+  ) -> Result<(), JsErrorBox> {
+    let mut encoder = self.encoder.borrow_mut();
+    let encoder = encoder.as_mut().ok_or_else(|| {
+      JsErrorBox::generic("Encoder has already been finished")
+    })?;
+
     wgpu_core::command::bundle_ffi::wgpu_render_bundle_draw_indexed_indirect(
-      &mut self.encoder.borrow_mut(),
+      encoder,
       indirect_buffer.id,
       indirect_offset,
     );
+    Ok(())
   }
 }
 
@@ -276,6 +345,16 @@ pub(crate) struct GPURenderBundleEncoderDescriptor {
   pub stencil_read_only: bool,
 }
 
+#[derive(Debug, thiserror::Error, deno_error::JsError)]
+enum SetBindGroupError {
+  #[class(inherit)]
+  #[error(transparent)]
+  WebIDL(#[from] WebIdlError),
+  #[class(inherit)]
+  #[error(transparent)]
+  Other(#[from] JsErrorBox),
+}
+
 pub struct GPURenderBundle {
   pub id: wgpu_core::id::RenderBundleId,
   pub label: String,
diff --git a/ext/webgpu/wrap/render_pass.rs b/ext/webgpu/wrap/render_pass.rs
index 7b8d198c8a..2bb84b2c60 100644
--- a/ext/webgpu/wrap/render_pass.rs
+++ b/ext/webgpu/wrap/render_pass.rs
@@ -10,6 +10,7 @@ use deno_core::v8;
 use deno_core::webidl::IntOptions;
 use deno_core::webidl::Nullable;
 use deno_core::webidl::WebIdlConverter;
+use deno_core::webidl::WebIdlError;
 use deno_core::GarbageCollected;
 use deno_core::WebIDL;
 
@@ -195,7 +196,7 @@ impl GPURenderPassEncoder {
     dynamic_offsets: v8::Local<'a, v8::Value>,
     dynamic_offsets_data_start: v8::Local<'a, v8::Value>,
     dynamic_offsets_data_length: v8::Local<'a, v8::Value>,
-  ) {
+  ) -> Result<(), WebIdlError> {
     const PREFIX: &str =
       "Failed to execute 'setBindGroup' on 'GPUComputePassEncoder'";
     let offsets =
@@ -209,8 +210,7 @@ impl GPURenderPassEncoder {
             clamp: false,
             enforce_range: true,
           },
-        )
-        .unwrap(); // TODO: dont unwrap err
+        )?;
         let len = u32::convert(
           scope,
           dynamic_offsets,
@@ -220,8 +220,7 @@ impl GPURenderPassEncoder {
             clamp: false,
             enforce_range: true,
           },
-        )
-        .unwrap(); // TODO: dont unwrap err
+        )?;
 
         // TODO
 
@@ -236,8 +235,7 @@ impl GPURenderPassEncoder {
             clamp: false,
             enforce_range: true,
           },
-        )
-        .unwrap() // TODO: dont unwrap err
+        )?
         .unwrap_or_default()
       };
 
@@ -251,6 +249,8 @@ impl GPURenderPassEncoder {
       )
       .err();
     self.error_handler.push_error(err);
+
+    Ok(())
   }
 
   fn set_pipeline(
diff --git a/ext/webgpu/wrap/webidl.rs b/ext/webgpu/wrap/webidl.rs
index 8a3909b7d0..3997dd658c 100644
--- a/ext/webgpu/wrap/webidl.rs
+++ b/ext/webgpu/wrap/webidl.rs
@@ -504,7 +504,7 @@ pub fn feature_names_to_features(
 }
 
 pub fn features_to_feature_names(
-  features: &wgpu_types::Features,
+  features: wgpu_types::Features,
 ) -> HashSet<GPUFeatureName> {
   use GPUFeatureName::*;
   let mut return_features = HashSet::new();