From a8bb4684d07f923db2f7694b975c6837c8ff94a9 Mon Sep 17 00:00:00 2001
From: Yulong Wang <7679871+fs-eire@users.noreply.github.com>
Date: Tue, 17 Feb 2026 16:07:11 -0800
Subject: [PATCH 1/6] add option for reduced datatype in WebAssembly builds

---
 cmake/CMakeLists.txt                          |  5 ++++
 .../op_kernel_type_control_overrides.inc      | 30 +++++++++++++++++++
 tools/ci_build/build.py                       |  1 +
 tools/ci_build/build_args.py                  |  5 ++++
 4 files changed, 41 insertions(+)

diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index 11244e46b78a0..f398ed2855057 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -209,6 +209,7 @@ option(onnxruntime_ENABLE_WEBASSEMBLY_DEBUG_INFO "Enable this option to turn on
 option(onnxruntime_ENABLE_WEBASSEMBLY_PROFILING "Enable this option to turn on WebAssembly profiling and preserve function names" OFF)
 option(onnxruntime_ENABLE_WEBASSEMBLY_OUTPUT_OPTIMIZED_MODEL "Enable this option to allow WebAssembly to output optimized model" OFF)
 option(onnxruntime_ENABLE_WEBASSEMBLY_RELAXED_SIMD "Enable WebAssembly Relaxed SIMD" OFF)
+option(onnxruntime_WEBASSEMBLY_REDUCE_DATATYPE "Enable reduced datatype macro in WebAssembly builds" OFF)
 
 # Enable bitcode for iOS
 option(onnxruntime_ENABLE_BITCODE "Enable bitcode for iOS only" OFF)
@@ -1751,6 +1752,10 @@ if (CMAKE_SYSTEM_NAME STREQUAL "Emscripten")
   message(STATUS "WebAssembly Build is enabled")
   list(APPEND ONNXRUNTIME_CMAKE_FILES onnxruntime_webassembly)
 
+  if (onnxruntime_WEBASSEMBLY_REDUCE_DATATYPE)
+    add_compile_definitions(ORT_WASM_REDUCE_DATATYPE)
+  endif()
+
   if (onnxruntime_ENABLE_WEBASSEMBLY_OUTPUT_OPTIMIZED_MODEL)
     add_compile_definitions(ORT_ENABLE_WEBASSEMBLY_OUTPUT_OPTIMIZED_MODEL)
   endif()
diff --git a/onnxruntime/core/providers/op_kernel_type_control_overrides.inc b/onnxruntime/core/providers/op_kernel_type_control_overrides.inc
index 58019f3b772c4..8cd7f50d82224 100644
--- a/onnxruntime/core/providers/op_kernel_type_control_overrides.inc
+++ b/onnxruntime/core/providers/op_kernel_type_control_overrides.inc
@@ -42,6 +42,36 @@ namespace op_kernel_type_control {
     using types = ::onnxruntime::TypeList<__VA_ARGS__>;             \
   };
 
+//
+// The following section is the default overrides for a reduced-size WebAssembly build.
+//
+#if defined(__wasm__) && defined(ORT_WASM_REDUCE_DATATYPE)
+ORT_SPECIFY_OP_KERNEL_ARG_ALLOWED_TYPES(kOnnxDomain, Cast, Input, 0,
+    bool,
+    int8_t, uint8_t, int32_t, uint32_t, int64_t, uint64_t,
+    float, MLFloat16)
+
+ORT_SPECIFY_OP_KERNEL_ARG_ALLOWED_TYPES(kOnnxDomain, Scatter, Input, 0,
+    bool,
+    int8_t, uint8_t, int32_t, uint32_t, int64_t, uint64_t,
+    float, MLFloat16)
+
+ORT_SPECIFY_OP_KERNEL_ARG_ALLOWED_TYPES(kOnnxDomain, ScatterElements, Input, 0,
+    bool,
+    int8_t, uint8_t, int32_t, uint32_t, int64_t, uint64_t,
+    float, MLFloat16)
+
+ORT_SPECIFY_OP_KERNEL_ARG_ALLOWED_TYPES(kOnnxDomain, ScatterND, Input, 0,
+    bool,
+    int8_t, uint8_t, int32_t, uint32_t, int64_t, uint64_t,
+    float, MLFloat16)
+
+ORT_SPECIFY_OP_KERNEL_GLOBAL_ALLOWED_TYPES(
+    bool,
+    int8_t, uint8_t, int16_t, uint16_t, int32_t, uint32_t, int64_t, uint64_t,
+    float, MLFloat16)
+#endif // defined(__wasm__) && defined(ORT_WASM_REDUCE_DATATYPE)
+
 // Examples:
 // Specify allowed types per Op kernel arg:
 //   ORT_SPECIFY_OP_KERNEL_ARG_ALLOWED_TYPES(kOnnxDomain, Cast, Input, 0, float, int64_t);
diff --git a/tools/ci_build/build.py b/tools/ci_build/build.py
index 05e1f96b7610c..33732c6eff937 100644
--- a/tools/ci_build/build.py
+++ b/tools/ci_build/build.py
@@ -504,6 +504,7 @@ def generate_build_tree(
         "-Donnxruntime_ENABLE_WEBASSEMBLY_THREADS=" + ("ON" if args.enable_wasm_threads else "OFF"),
         "-Donnxruntime_ENABLE_WEBASSEMBLY_DEBUG_INFO=" + ("ON" if args.enable_wasm_debug_info else "OFF"),
         "-Donnxruntime_ENABLE_WEBASSEMBLY_PROFILING=" + ("ON" if args.enable_wasm_profiling else "OFF"),
+        "-Donnxruntime_WEBASSEMBLY_REDUCE_DATATYPE=" + ("ON" if args.wasm_reduce_datatype else "OFF"),
         "-Donnxruntime_ENABLE_LAZY_TENSOR=" + ("ON" if args.enable_lazy_tensor else "OFF"),
         "-Donnxruntime_ENABLE_CUDA_PROFILING=" + ("ON" if args.enable_cuda_profiling else "OFF"),
         "-Donnxruntime_USE_XNNPACK=" + ("ON" if args.use_xnnpack else "OFF"),
diff --git a/tools/ci_build/build_args.py b/tools/ci_build/build_args.py
index f32666f65cc38..9ed6e4543fc23 100644
--- a/tools/ci_build/build_args.py
+++ b/tools/ci_build/build_args.py
@@ -372,6 +372,11 @@ def add_webassembly_args(parser: argparse.ArgumentParser) -> None:
     """Adds arguments for WebAssembly (WASM) platform builds."""
     parser.add_argument("--build_wasm", action="store_true", help="Build for WebAssembly.")
     parser.add_argument("--build_wasm_static_lib", action="store_true", help="Build WebAssembly static library.")
+    parser.add_argument(
+        "--wasm_reduce_datatype",
+        action="store_true",
+        help="Enable WebAssembly reduced datatype support for kernel type control overrides.",
+    )
     parser.add_argument("--emsdk_version", default="4.0.23", help="Specify version of emsdk.")
     parser.add_argument(
         "--enable_wasm_jspi", action="store_true", help="Enable WebAssembly JavaScript Promise Integration."

From 4c3b5222b18137ad9b1e93a240a5a0702aafe3f1 Mon Sep 17 00:00:00 2001
From: Yulong Wang <7679871+fs-eire@users.noreply.github.com>
Date: Mon, 23 Feb 2026 16:26:59 -0800
Subject: [PATCH 2/6] use config

---
 cmake/CMakeLists.txt                          |  5 ----
 .../op_kernel_type_control_overrides.inc      | 30 -------------------
 onnxruntime/wasm/reduced_types.config         | 14 +++++++++
 tools/ci_build/build.py                       |  1 -
 tools/ci_build/build_args.py                  |  5 ----
 5 files changed, 14 insertions(+), 41 deletions(-)
 create mode 100644 onnxruntime/wasm/reduced_types.config

diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index f398ed2855057..11244e46b78a0 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -209,7 +209,6 @@ option(onnxruntime_ENABLE_WEBASSEMBLY_DEBUG_INFO "Enable this option to turn on
 option(onnxruntime_ENABLE_WEBASSEMBLY_PROFILING "Enable this option to turn on WebAssembly profiling and preserve function names" OFF)
 option(onnxruntime_ENABLE_WEBASSEMBLY_OUTPUT_OPTIMIZED_MODEL "Enable this option to allow WebAssembly to output optimized model" OFF)
 option(onnxruntime_ENABLE_WEBASSEMBLY_RELAXED_SIMD "Enable WebAssembly Relaxed SIMD" OFF)
-option(onnxruntime_WEBASSEMBLY_REDUCE_DATATYPE "Enable reduced datatype macro in WebAssembly builds" OFF)
 
 # Enable bitcode for iOS
 option(onnxruntime_ENABLE_BITCODE "Enable bitcode for iOS only" OFF)
@@ -1752,10 +1751,6 @@ if (CMAKE_SYSTEM_NAME STREQUAL "Emscripten")
   message(STATUS "WebAssembly Build is enabled")
   list(APPEND ONNXRUNTIME_CMAKE_FILES onnxruntime_webassembly)
 
-  if (onnxruntime_WEBASSEMBLY_REDUCE_DATATYPE)
-    add_compile_definitions(ORT_WASM_REDUCE_DATATYPE)
-  endif()
-
   if (onnxruntime_ENABLE_WEBASSEMBLY_OUTPUT_OPTIMIZED_MODEL)
     add_compile_definitions(ORT_ENABLE_WEBASSEMBLY_OUTPUT_OPTIMIZED_MODEL)
   endif()
diff --git a/onnxruntime/core/providers/op_kernel_type_control_overrides.inc b/onnxruntime/core/providers/op_kernel_type_control_overrides.inc
index 8cd7f50d82224..58019f3b772c4 100644
--- a/onnxruntime/core/providers/op_kernel_type_control_overrides.inc
+++ b/onnxruntime/core/providers/op_kernel_type_control_overrides.inc
@@ -42,36 +42,6 @@ namespace op_kernel_type_control {
     using types = ::onnxruntime::TypeList<__VA_ARGS__>;             \
   };
 
-//
-// The following section is the default overrides for a reduced-size WebAssembly build.
-//
-#if defined(__wasm__) && defined(ORT_WASM_REDUCE_DATATYPE)
-ORT_SPECIFY_OP_KERNEL_ARG_ALLOWED_TYPES(kOnnxDomain, Cast, Input, 0,
-    bool,
-    int8_t, uint8_t, int32_t, uint32_t, int64_t, uint64_t,
-    float, MLFloat16)
-
-ORT_SPECIFY_OP_KERNEL_ARG_ALLOWED_TYPES(kOnnxDomain, Scatter, Input, 0,
-    bool,
-    int8_t, uint8_t, int32_t, uint32_t, int64_t, uint64_t,
-    float, MLFloat16)
-
-ORT_SPECIFY_OP_KERNEL_ARG_ALLOWED_TYPES(kOnnxDomain, ScatterElements, Input, 0,
-    bool,
-    int8_t, uint8_t, int32_t, uint32_t, int64_t, uint64_t,
-    float, MLFloat16)
-
-ORT_SPECIFY_OP_KERNEL_ARG_ALLOWED_TYPES(kOnnxDomain, ScatterND, Input, 0,
-    bool,
-    int8_t, uint8_t, int32_t, uint32_t, int64_t, uint64_t,
-    float, MLFloat16)
-
-ORT_SPECIFY_OP_KERNEL_GLOBAL_ALLOWED_TYPES(
-    bool,
-    int8_t, uint8_t, int16_t, uint16_t, int32_t, uint32_t, int64_t, uint64_t,
-    float, MLFloat16)
-#endif // defined(__wasm__) && defined(ORT_WASM_REDUCE_DATATYPE)
-
 // Examples:
 // Specify allowed types per Op kernel arg:
 //   ORT_SPECIFY_OP_KERNEL_ARG_ALLOWED_TYPES(kOnnxDomain, Cast, Input, 0, float, int64_t);
diff --git a/onnxruntime/wasm/reduced_types.config b/onnxruntime/wasm/reduced_types.config
new file mode 100644
index 0000000000000..5e5ced7e759f4
--- /dev/null
+++ b/onnxruntime/wasm/reduced_types.config
@@ -0,0 +1,14 @@
+# Reduced type configuration for WebAssembly builds.
+# This limits globally allowed types for all operators to reduce binary size (~230KB).
+# See https://onnxruntime.ai/docs/reference/operators/reduced-operator-config-file.html
+#
+# Usage: pass to build.py via:
+#   --include_ops_by_config onnxruntime/wasm/reduced_types.config --enable_reduced_operator_type_support
+#
+# Excluded types: float4, float8, float64 (double), int16, uint16
+
+# Keep all operators - only apply type reduction
+!no_ops_specified_means_all_ops_are_required
+
+# Globally allowed types for all operators
+!globally_allowed_types;bool,int8_t,uint8_t,int32_t,uint32_t,int64_t,uint64_t,float,MLFloat16
diff --git a/tools/ci_build/build.py b/tools/ci_build/build.py
index 33732c6eff937..05e1f96b7610c 100644
--- a/tools/ci_build/build.py
+++ b/tools/ci_build/build.py
@@ -504,7 +504,6 @@ def generate_build_tree(
         "-Donnxruntime_ENABLE_WEBASSEMBLY_THREADS=" + ("ON" if args.enable_wasm_threads else "OFF"),
         "-Donnxruntime_ENABLE_WEBASSEMBLY_DEBUG_INFO=" + ("ON" if args.enable_wasm_debug_info else "OFF"),
         "-Donnxruntime_ENABLE_WEBASSEMBLY_PROFILING=" + ("ON" if args.enable_wasm_profiling else "OFF"),
-        "-Donnxruntime_WEBASSEMBLY_REDUCE_DATATYPE=" + ("ON" if args.wasm_reduce_datatype else "OFF"),
         "-Donnxruntime_ENABLE_LAZY_TENSOR=" + ("ON" if args.enable_lazy_tensor else "OFF"),
         "-Donnxruntime_ENABLE_CUDA_PROFILING=" + ("ON" if args.enable_cuda_profiling else "OFF"),
         "-Donnxruntime_USE_XNNPACK=" + ("ON" if args.use_xnnpack else "OFF"),
diff --git a/tools/ci_build/build_args.py b/tools/ci_build/build_args.py
index 9ed6e4543fc23..f32666f65cc38 100644
--- a/tools/ci_build/build_args.py
+++ b/tools/ci_build/build_args.py
@@ -372,11 +372,6 @@ def add_webassembly_args(parser: argparse.ArgumentParser) -> None:
     """Adds arguments for WebAssembly (WASM) platform builds."""
     parser.add_argument("--build_wasm", action="store_true", help="Build for WebAssembly.")
     parser.add_argument("--build_wasm_static_lib", action="store_true", help="Build WebAssembly static library.")
-    parser.add_argument(
-        "--wasm_reduce_datatype",
-        action="store_true",
-        help="Enable WebAssembly reduced datatype support for kernel type control overrides.",
-    )
     parser.add_argument("--emsdk_version", default="4.0.23", help="Specify version of emsdk.")
     parser.add_argument(
         "--enable_wasm_jspi", action="store_true", help="Enable WebAssembly JavaScript Promise Integration."

From b56d157e20adfb477e221c7f22a3a68ab87e457f Mon Sep 17 00:00:00 2001
From: Yulong Wang <7679871+fs-eire@users.noreply.github.com>
Date: Mon, 23 Feb 2026 23:19:47 -0800
Subject: [PATCH 3/6] update build script

---
 js/build_webgpu.bat | 3 ++-
 js/build_webgpu.sh  | 4 +++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/js/build_webgpu.bat b/js/build_webgpu.bat
index d32a7ab1abb81..359365959a78e 100644
--- a/js/build_webgpu.bat
+++ b/js/build_webgpu.bat
@@ -69,7 +69,8 @@ popd
 set PATH=C:\Program Files\Git\usr\bin;%PATH%
 
 call %ROOT%build.bat --config %CONFIG% %CONFIG_EXTRA_FLAG% --skip_submodule_sync --build_wasm --target onnxruntime_webassembly --skip_tests^
- --enable_wasm_simd --enable_wasm_threads --use_webnn --use_webgpu --enable_wasm_jspi --build_dir %BUILD_DIR%
+ --enable_wasm_simd --enable_wasm_threads --use_webnn --use_webgpu --enable_wasm_jspi --build_dir %BUILD_DIR%^
+ --include_ops_by_config %ROOT%onnxruntime\wasm\reduced_types.config --enable_reduced_operator_type_support
 
 IF NOT "%ERRORLEVEL%" == "0" (
   exit /b %ERRORLEVEL%
diff --git a/js/build_webgpu.sh b/js/build_webgpu.sh
index ea12093c37cf7..1e9492d818680 100755
--- a/js/build_webgpu.sh
+++ b/js/build_webgpu.sh
@@ -101,7 +101,9 @@ echo "Calling $ROOT_DIR/build.sh to build WebAssembly..."
     --use_webnn \
     --use_webgpu \
     --enable_wasm_jspi \
-    --build_dir "$BUILD_DIR"
+    --build_dir "$BUILD_DIR" \
+    --include_ops_by_config "$ROOT_DIR/onnxruntime/wasm/reduced_types.config" \
+    --enable_reduced_operator_type_support
 
 # The 'set -e' command at the beginning of the script ensures that the script will exit
 # immediately if the build.sh command (or any other command) fails.

From 32454023a4f6dddb5f505dcee3bcf16dcf0d527f Mon Sep 17 00:00:00 2001
From: Yulong Wang <7679871+fs-eire@users.noreply.github.com>
Date: Tue, 24 Feb 2026 02:03:58 -0800
Subject: [PATCH 4/6] revise build bat

---
 js/build_jsep.bat   | 17 +++++++++++++++--
 js/build_webgpu.bat | 19 ++++++++++++++++---
 2 files changed, 31 insertions(+), 5 deletions(-)

diff --git a/js/build_jsep.bat b/js/build_jsep.bat
index ace96e978d934..fb94f0841ee01 100644
--- a/js/build_jsep.bat
+++ b/js/build_jsep.bat
@@ -64,8 +64,21 @@ popd
 
 set PATH=C:\Program Files\Git\usr\bin;%PATH%
 
-call %ROOT%build.bat --config %CONFIG% %CONFIG_EXTRA_FLAG% --skip_submodule_sync --build_wasm --skip_tests^
- --enable_wasm_simd --enable_wasm_threads --use_jsep --use_webnn --target onnxruntime_webassembly --build_dir %BUILD_DIR%
+call %ROOT%build.bat^
+ --config %CONFIG%^
+ %CONFIG_EXTRA_FLAG%^
+ --parallel^
+ --skip_submodule_sync^
+ --build_wasm^
+ --target onnxruntime_webassembly^
+ --skip_tests^
+ --enable_wasm_simd^
+ --enable_wasm_threads^
+ --use_jsep^
+ --use_webnn^
+ --build_dir %BUILD_DIR%^
+ --include_ops_by_config %ROOT%onnxruntime\wasm\reduced_types.config^
+ --enable_reduced_operator_type_support
 
 IF NOT "%ERRORLEVEL%" == "0" (
   exit /b %ERRORLEVEL%
diff --git a/js/build_webgpu.bat b/js/build_webgpu.bat
index 359365959a78e..5d017edbfa22b 100644
--- a/js/build_webgpu.bat
+++ b/js/build_webgpu.bat
@@ -68,9 +68,22 @@ popd
 
 set PATH=C:\Program Files\Git\usr\bin;%PATH%
 
-call %ROOT%build.bat --config %CONFIG% %CONFIG_EXTRA_FLAG% --skip_submodule_sync --build_wasm --target onnxruntime_webassembly --skip_tests^
- --enable_wasm_simd --enable_wasm_threads --use_webnn --use_webgpu --enable_wasm_jspi --build_dir %BUILD_DIR%^
- --include_ops_by_config %ROOT%onnxruntime\wasm\reduced_types.config --enable_reduced_operator_type_support
+call %ROOT%build.bat^
+ --config %CONFIG%^
+ %CONFIG_EXTRA_FLAG%^
+ --parallel^
+ --skip_submodule_sync^
+ --build_wasm^
+ --target onnxruntime_webassembly^
+ --skip_tests^
+ --enable_wasm_simd^
+ --enable_wasm_threads^
+ --use_webnn^
+ --use_webgpu^
+ --enable_wasm_jspi^
+ --build_dir %BUILD_DIR%^
+ --include_ops_by_config %ROOT%onnxruntime\wasm\reduced_types.config^
+ --enable_reduced_operator_type_support
 
 IF NOT "%ERRORLEVEL%" == "0" (
   exit /b %ERRORLEVEL%

From 6f041865d5bc83406e51eee943c6412da2330fe5 Mon Sep 17 00:00:00 2001
From: Yulong Wang <7679871+fs-eire@users.noreply.github.com>
Date: Tue, 24 Feb 2026 02:18:56 -0800
Subject: [PATCH 5/6] update YML

---
 .../workflows/linux-wasm-ci-build-and-test-workflow.yml   | 8 ++++++++
 .../github/azure-pipelines/templates/linux-wasm-ci.yml    | 5 +++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/linux-wasm-ci-build-and-test-workflow.yml b/.github/workflows/linux-wasm-ci-build-and-test-workflow.yml
index e08ce13c6dd33..3139df81d4269 100644
--- a/.github/workflows/linux-wasm-ci-build-and-test-workflow.yml
+++ b/.github/workflows/linux-wasm-ci-build-and-test-workflow.yml
@@ -50,6 +50,12 @@ jobs:
         --enable_wasm_simd
         ${{ inputs.enable_wasm_threads == true && '--enable_wasm_threads' || '' }}
         ${{ inputs.extra_build_args }}
+      reduced_size_build_args: >-
+        --disable_ml_ops
+        --disable_generation_ops
+        --disable_types string float4 float8 optional sparsetensor
+        --include_ops_by_config onnxruntime/wasm/reduced_types.config
+        --enable_reduced_operator_type_support
 
     steps:
       - name: Checkout code
@@ -109,6 +115,7 @@ jobs:
             --use_webnn \
             --target onnxruntime_webassembly \
             ${{ inputs.build_config == 'Release' && '--enable_wasm_api_exception_catching' || '' }} \
+            ${{ env.reduced_size_build_args }} \
             --skip_tests
         working-directory: ${{ github.workspace }}
 
@@ -122,6 +129,7 @@ jobs:
             --use_webnn \
             --enable_wasm_jspi \
             --target onnxruntime_webassembly \
+            ${{ env.reduced_size_build_args }} \
             --skip_tests
         working-directory: ${{ github.workspace }}
 
diff --git a/tools/ci_build/github/azure-pipelines/templates/linux-wasm-ci.yml b/tools/ci_build/github/azure-pipelines/templates/linux-wasm-ci.yml
index ef30a49b0fb83..15420bf905f9f 100644
--- a/tools/ci_build/github/azure-pipelines/templates/linux-wasm-ci.yml
+++ b/tools/ci_build/github/azure-pipelines/templates/linux-wasm-ci.yml
@@ -57,6 +57,7 @@ jobs:
       ExceptionHandlingBuildArgs: '--enable_wasm_api_exception_catching'
     ${{ else }}:
       ExceptionHandlingBuildArgs: ''
+    reducedSizeBuildArgs: '--disable_ml_ops --disable_generation_ops --disable_types string float4 float8 optional sparsetensor --include_ops_by_config $(Build.SourcesDirectory)/onnxruntime/wasm/reduced_types.config --enable_reduced_operator_type_support'
     runCodesignValidationInjection: false
     TODAY: $[format('{0:dd}{0:MM}{0:yyyy}', pipeline.startTime)]
     ORT_CACHE_DIR: $(Agent.TempDirectory)/ort_ccache
@@ -141,7 +142,7 @@ jobs:
         ${{ else }}:
           AdditionalKey: wasm_inferencing_webgpu | ${{ parameters.BuildConfig }}
         CacheDir: $(ORT_CACHE_DIR)/wasm_inferencing_webgpu
-        Arguments: '$(CommonBuildArgs) --build_dir $(Build.BinariesDirectory)/wasm_inferencing_webgpu --use_webgpu --use_webnn --target onnxruntime_webassembly $(ExceptionHandlingBuildArgs) --skip_tests'
+        Arguments: '$(CommonBuildArgs) --build_dir $(Build.BinariesDirectory)/wasm_inferencing_webgpu --use_webgpu --use_webnn --target onnxruntime_webassembly $(ExceptionHandlingBuildArgs) $(reducedSizeBuildArgs) --skip_tests'
         DisplayName: 'Build (simd + threads + WebGPU experimental)'
         WithCache: ${{ parameters.WithCache }}
 
@@ -154,7 +155,7 @@ jobs:
         ${{ else }}:
           AdditionalKey: wasm_inferencing_webgpu_jspi | ${{ parameters.BuildConfig }}
         CacheDir: $(ORT_CACHE_DIR)/wasm_inferencing_webgpu_jspi
-        Arguments: '$(CommonBuildArgs) --build_dir $(Build.BinariesDirectory)/wasm_inferencing_webgpu_jspi --use_webgpu --use_webnn --enable_wasm_jspi --target onnxruntime_webassembly --skip_tests'
+        Arguments: '$(CommonBuildArgs) --build_dir $(Build.BinariesDirectory)/wasm_inferencing_webgpu_jspi --use_webgpu --use_webnn --enable_wasm_jspi --target onnxruntime_webassembly $(reducedSizeBuildArgs) --skip_tests'
         DisplayName: 'Build (simd + threads + WebGPU experimental, JSPI)'
         WithCache: ${{ parameters.WithCache }}
 

From 01cd95e3fe646847cb64394144c9202f91d5bd6d Mon Sep 17 00:00:00 2001
From: Yulong Wang <7679871+fs-eire@users.noreply.github.com>
Date: Wed, 25 Feb 2026 01:28:49 +0000
Subject: [PATCH 6/6] fix build

---
 .github/workflows/linux-wasm-ci-build-and-test-workflow.yml    | 3 +++
 .../github/azure-pipelines/templates/linux-wasm-ci.yml         | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/.github/workflows/linux-wasm-ci-build-and-test-workflow.yml b/.github/workflows/linux-wasm-ci-build-and-test-workflow.yml
index 3139df81d4269..4288442720493 100644
--- a/.github/workflows/linux-wasm-ci-build-and-test-workflow.yml
+++ b/.github/workflows/linux-wasm-ci-build-and-test-workflow.yml
@@ -74,6 +74,9 @@ jobs:
           python-version: "3.12"
           architecture: ${{ env.buildArch }}
 
+      - name: Install python dependencies
+        run: python -m pip install flatbuffers
+
       - uses: microsoft/onnxruntime-github-actions/setup-build-tools@v0.0.9
         with:
           vcpkg-version: '2025.08.27'
diff --git a/tools/ci_build/github/azure-pipelines/templates/linux-wasm-ci.yml b/tools/ci_build/github/azure-pipelines/templates/linux-wasm-ci.yml
index 15420bf905f9f..97e7a43a88824 100644
--- a/tools/ci_build/github/azure-pipelines/templates/linux-wasm-ci.yml
+++ b/tools/ci_build/github/azure-pipelines/templates/linux-wasm-ci.yml
@@ -93,6 +93,9 @@ jobs:
     inputs:
       versionSpec: '22.x'
 
+  - script: python -m pip install flatbuffers
+    displayName: 'Install python dependencies'
+
   - ${{if eq(parameters.WithCache, true)}}:
     - script: |
         set -ex