diff --git a/cmake/system.cmake b/cmake/system.cmake
index 7ecabcb..a1ef54b 100644
--- a/cmake/system.cmake
+++ b/cmake/system.cmake
@@ -26,6 +26,7 @@ set(WHOA_MAC_10_14 1014)
 set(WHOA_MAC_10_15 1015)
 set(WHOA_MAC_11_0 1100)
 set(WHOA_LINUX_UNK 9999)
+set(WHOA_WEB_UNK 9999)
 
 if(${CMAKE_SYSTEM_NAME} MATCHES "Windows")
     set(WHOA_SYSTEM_WIN 1)
@@ -36,6 +37,9 @@ elseif(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
 elseif(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
     set(WHOA_SYSTEM_LINUX 1)
     add_definitions(-DWHOA_SYSTEM_LINUX=1)
+elseif(${CMAKE_SYSTEM_NAME} MATCHES "Emscripten")
+    set(WHOA_SYSTEM_WEB 1)
+    add_definitions(-DWHOA_SYSTEM_WEB=1)
 endif()
 
 if(${WHOA_SYSTEM_WIN})
@@ -83,5 +87,9 @@ elseif(${WHOA_SYSTEM_MAC})
 elseif(${WHOA_SYSTEM_LINUX})
     set(WHOA_SYSTEM_VERSION ${WHOA_LINUX_UNK})
 
+    add_definitions(-DWHOA_SYSTEM_VERSION=${WHOA_SYSTEM_VERSION})
+elseif(${WHOA_SYSTEM_WEB})
+    set(WHOA_SYSTEM_VERSION ${WHOA_WEB_UNK})
+
     add_definitions(-DWHOA_SYSTEM_VERSION=${WHOA_SYSTEM_VERSION})
 endif()
diff --git a/cmake/toolchain-web.cmake b/cmake/toolchain-web.cmake
new file mode 100644
index 0000000..e39dafc
--- /dev/null
+++ b/cmake/toolchain-web.cmake
@@ -0,0 +1,73 @@
+# Toolchain file for WebAssembly/WebGPU using Emscripten
+#
+# Usage:
+#   cmake -DCMAKE_TOOLCHAIN_FILE=lib/system/cmake/toolchain-web.cmake ..
+#
+# Requires EMSDK environment variable to be set, or emcmake to be in PATH
+
+set(CMAKE_SYSTEM_NAME Emscripten)
+set(CMAKE_SYSTEM_VERSION 1)
+set(CMAKE_SIZEOF_VOID_P 4)  # wasm32 uses 32-bit pointers
+set(CMAKE_C_BYTE_ORDER LITTLE_ENDIAN)
+set(CMAKE_CXX_BYTE_ORDER LITTLE_ENDIAN)
+
+# Find Emscripten
+if(DEFINED ENV{EMSDK})
+    set(EMSDK_PATH "$ENV{EMSDK}")
+    set(EMSCRIPTEN_ROOT "${EMSDK_PATH}/upstream/emscripten")
+elseif(EXISTS "/usr/share/emscripten")
+    set(EMSCRIPTEN_ROOT "/usr/share/emscripten")
+else()
+    message(FATAL_ERROR "Could not find Emscripten. Set EMSDK environment variable or install Emscripten.")
+endif()
+
+# Compilers
+set(CMAKE_C_COMPILER "${EMSCRIPTEN_ROOT}/emcc")
+set(CMAKE_CXX_COMPILER "${EMSCRIPTEN_ROOT}/em++")
+set(CMAKE_AR "${EMSCRIPTEN_ROOT}/emar")
+set(CMAKE_RANLIB "${EMSCRIPTEN_ROOT}/emranlib")
+
+# Target environment
+set(CMAKE_FIND_ROOT_PATH "${EMSCRIPTEN_ROOT}")
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+
+# Output settings
+set(CMAKE_EXECUTABLE_SUFFIX ".js")
+
+# WebGPU support (requires Emscripten 3.1.35+)
+set(WHOA_WEB_USE_WEBGPU ON CACHE BOOL "Enable WebGPU support")
+
+# Emscripten linker flags
+set(WHOA_WEB_LINK_FLAGS "")
+
+# Memory and async support
+string(APPEND WHOA_WEB_LINK_FLAGS " -sALLOW_MEMORY_GROWTH=1")
+
+string(APPEND WHOA_WEB_LINK_FLAGS " -sASYNCIFY")
+string(APPEND WHOA_WEB_LINK_FLAGS " -sASYNCIFY_DEBUG=0")
+string(APPEND WHOA_WEB_LINK_FLAGS " -sEXIT_RUNTIME=0")
+
+# Debug symbols and source maps
+string(APPEND WHOA_WEB_LINK_FLAGS " -g")
+string(APPEND WHOA_WEB_LINK_FLAGS " -gsource-map")
+string(APPEND WHOA_WEB_LINK_FLAGS " --source-map-base ./")
+
+# Filesystem support
+string(APPEND WHOA_WEB_LINK_FLAGS " -sFORCE_FILESYSTEM=1")
+string(APPEND WHOA_WEB_LINK_FLAGS " -sFETCH=1")
+
+# WebGPU (uses browser's native implementation via emdawnwebgpu bindings)
+if(WHOA_WEB_USE_WEBGPU)
+    set(WHOA_WEB_WEBGPU_PORT "--use-port=emdawnwebgpu")
+    string(APPEND WHOA_WEB_LINK_FLAGS " ${WHOA_WEB_WEBGPU_PORT}")
+endif()
+
+# Export settings
+string(APPEND WHOA_WEB_LINK_FLAGS " -sEXPORTED_RUNTIME_METHODS=['ccall','cwrap']")
+
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${WHOA_WEB_WEBGPU_PORT}")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${WHOA_WEB_WEBGPU_PORT}")
+set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${WHOA_WEB_LINK_FLAGS}")