diff --git a/src/webgpu/shader/validation/types/enumerant.spec.ts b/src/webgpu/shader/validation/types/enumerant.spec.ts
index 4cebb35b9c5a..342b105290a2 100644
--- a/src/webgpu/shader/validation/types/enumerant.spec.ts
+++ b/src/webgpu/shader/validation/types/enumerant.spec.ts
@@ -51,6 +51,7 @@ const kEnumerantValues = [
   'storage',
   'uniform',
   'handle',
+  'immediate',
 
   // Texel formats
   'rgba8unorm',
diff --git a/src/webgpu/shader/validation/types/pointer.spec.ts b/src/webgpu/shader/validation/types/pointer.spec.ts
index c787668ad5e4..8bc1389ae3cd 100644
--- a/src/webgpu/shader/validation/types/pointer.spec.ts
+++ b/src/webgpu/shader/validation/types/pointer.spec.ts
@@ -10,6 +10,8 @@ import {
   getVarDeclShader,
   supportsWrite,
   ShaderStage,
+  skipIfAddressSpaceNotSupported,
+  skipIfImmediateDataNotSupported,
 } from '../decl/util.js';
 import { ShaderValidationTest } from '../shader_validation_test.js';
 
@@ -19,11 +21,22 @@ g.test('missing_type')
   .desc('Test that pointer types require an element type')
   .params(u =>
     u
-      .combine('aspace', ['function', 'private', 'workgroup', 'storage', 'uniform'] as const)
+      .combine('aspace', [
+        'function',
+        'private',
+        'workgroup',
+        'storage',
+        'uniform',
+        'immediate',
+      ] as const)
       .combine('comma', ['', ','] as const)
   )
   .fn(t => {
-    const code = `alias T = ptr<${t.params.aspace}${t.params.comma}>;`;
+    if (t.params.aspace === 'immediate') {
+      skipIfImmediateDataNotSupported(t);
+    }
+    const header = t.params.aspace === 'immediate' ? 'requires immediate_address_space;\n' : '';
+    const code = `${header}alias T = ptr<${t.params.aspace}${t.params.comma}>;`;
     t.expectCompileResult(false, code);
   });
 
@@ -37,13 +50,18 @@ g.test('address_space')
         'workgroup',
         'storage',
         'uniform',
+        'immediate',
         'handle',
         'bad_aspace',
       ] as const)
       .combine('comma', ['', ','] as const)
   )
   .fn(t => {
-    const code = `alias T = ptr<${t.params.aspace}, u32${t.params.comma}>;`;
+    if (t.params.aspace === 'immediate') {
+      skipIfImmediateDataNotSupported(t);
+    }
+    const header = t.params.aspace === 'immediate' ? 'requires immediate_address_space;\n' : '';
+    const code = `${header}alias T = ptr<${t.params.aspace}, u32${t.params.comma}>;`;
     const success = t.params.aspace !== 'handle' && t.params.aspace !== 'bad_aspace';
     t.expectCompileResult(success, code);
   });
@@ -52,13 +70,24 @@ g.test('access_mode')
   .desc('Test access mode in pointer type parameterization')
   .params(u =>
     u
-      .combine('aspace', ['function', 'private', 'storage', 'uniform', 'workgroup'] as const)
+      .combine('aspace', [
+        'function',
+        'private',
+        'storage',
+        'uniform',
+        'workgroup',
+        'immediate',
+      ] as const)
       .combine('access', ['read', 'write', 'read_write'] as const)
       .combine('comma', ['', ','] as const)
   )
   .fn(t => {
     // Default access mode is tested above.
-    const code = `alias T = ptr<${t.params.aspace}, u32, ${t.params.access}${t.params.comma}>;`;
+    if (t.params.aspace === 'immediate') {
+      skipIfImmediateDataNotSupported(t);
+    }
+    const header = t.params.aspace === 'immediate' ? 'requires immediate_address_space;\n' : '';
+    const code = `${header}alias T = ptr<${t.params.aspace}, u32, ${t.params.access}${t.params.comma}>;`;
     const success = t.params.aspace === 'storage' && t.params.access !== 'write';
     t.expectCompileResult(success, code);
   });
@@ -158,6 +187,7 @@ g.test('let_ptr_explicit_type_matches_var')
       .combine('ptrStoreType', ['i32', 'u32'])
   )
   .fn(t => {
+    skipIfAddressSpaceNotSupported(t, t.params.addressSpace);
     // Match the address space and access mode.
     const prog = getVarDeclShader(t.params, `let p: ${pointerType(t.params)} = &x;`);
     const ok = t.params.ptrStoreType === 'i32'; // The store type matches the variable's store type.
@@ -178,6 +208,7 @@ g.test('let_ptr_reads')
       .combine('ptrStoreType', ['i32'])
   )
   .fn(t => {
+    skipIfAddressSpaceNotSupported(t, t.params.addressSpace);
     // Try reading through the pointer.
     const typePart = t.params.inferPtrType ? `: ${pointerType(t.params)}` : '';
     const prog = getVarDeclShader(t.params, `let p${typePart} = &x; let read = *p;`);
@@ -200,6 +231,7 @@ g.test('let_ptr_writes')
       .combine('ptrStoreType', ['i32'])
   )
   .fn(t => {
+    skipIfAddressSpaceNotSupported(t, t.params.addressSpace);
     // Try writing through the pointer.
     const typePart = t.params.inferPtrType ? `: ${pointerType(t.params)}` : '';
     const prog = getVarDeclShader(t.params, `let p${typePart} = &x; *p = 42;`);
@@ -243,6 +275,12 @@ const kStoreTypeNotInstantiable: Record<string, string> = {
   functionRTArray: 'alias p = ptr<function,array<i32>>;',
   RTArrayNotLast: 'struct S { a: array<i32>, b: i32 } alias p = ptr<storage,S>;',
   nestedRTArray: 'struct S { a: array<i32>, b: i32 } struct { s: S } alias p = ptr<storage,T>;',
+  immediateBool: 'requires immediate_address_space; alias p = ptr<immediate,bool>;',
+  immediateArray: 'requires immediate_address_space; alias p = ptr<immediate,array<u32, 4>>;',
+  immediateStructWithArray:
+    'requires immediate_address_space; struct S { data: array<u32, 4> } alias p = ptr<immediate,S>;',
+  immediateAtomic: 'requires immediate_address_space; alias p = ptr<immediate,atomic<u32>>;',
+  immediateRuntimeArray: 'requires immediate_address_space; alias p = ptr<immediate,array<u32>>;',
 } as const;
 
 g.test('ptr_not_instantiable')
diff --git a/src/webgpu/shader/validation/types/ref.spec.ts b/src/webgpu/shader/validation/types/ref.spec.ts
index 96f4e464e296..3e0f2f56187d 100644
--- a/src/webgpu/shader/validation/types/ref.spec.ts
+++ b/src/webgpu/shader/validation/types/ref.spec.ts
@@ -3,6 +3,7 @@ Validation tests for ref types
 `;
 
 import { makeTestGroup } from '../../../../common/framework/test_group.js';
+import { skipIfImmediateDataNotSupported } from '../decl/util.js';
 import { ShaderValidationTest } from '../shader_validation_test.js';
 
 export const g = makeTestGroup(ShaderValidationTest);
@@ -55,3 +56,15 @@ g.test('not_typeable_alias')
     alias a = ${t.params.view}<private, ${t.params.type}>;`;
     t.expectCompileResult(t.params.view === 'ptr', code);
   });
+
+g.test('not_typeable_ref_immediate')
+  .desc('Test that ref<immediate, T> cannot be written as an explicit type.')
+  .params(u => u.combine('type', kTypes))
+  .fn(t => {
+    skipIfImmediateDataNotSupported(t);
+    const code = `
+      requires immediate_address_space;
+      struct S { a : u32 }
+      alias a = ref<immediate, ${t.params.type}>;`;
+    t.expectCompileResult(false, code);
+  });