diff --git a/AK/Platform.h b/AK/Platform.h
index 2aefdda7122..a6c3f581962 100644
--- a/AK/Platform.h
+++ b/AK/Platform.h
@@ -56,12 +56,6 @@
 #    define AK_IS_ARCH_PPC() 0
 #endif
 
-#ifdef __wasm32__
-#    define AK_IS_ARCH_WASM32() 1
-#else
-#    define AK_IS_ARCH_WASM32() 0
-#endif
-
 #if (defined(__SIZEOF_POINTER__) && __SIZEOF_POINTER__ == 8) || defined(_WIN64)
 #    define AK_ARCH_64_BIT
 #else
@@ -156,10 +150,6 @@
 #    define AK_OS_ANDROID
 #endif
 
-#if defined(__EMSCRIPTEN__)
-#    define AK_OS_EMSCRIPTEN
-#endif
-
 #define ARCH(arch) (AK_IS_ARCH_##arch())
 
 #if ARCH(X86_64) || ARCH(I386)
diff --git a/Libraries/LibCore/CMakeLists.txt b/Libraries/LibCore/CMakeLists.txt
index 6650ee952ed..01c72581e10 100644
--- a/Libraries/LibCore/CMakeLists.txt
+++ b/Libraries/LibCore/CMakeLists.txt
@@ -71,14 +71,14 @@ else()
         TCPServer.cpp)
 endif()
 
-if (NOT WIN32 AND NOT EMSCRIPTEN)
+if (NOT WIN32)
     list(APPEND SOURCES LocalServer.cpp)
-elseif (WIN32)
+else()
     list(APPEND SOURCES LocalServerWindows.cpp)
 endif()
 
 # FIXME: Implement these for other systems.
-if (LINUX AND NOT EMSCRIPTEN)
+if (LINUX)
     list(APPEND SOURCES
         FileWatcherLinux.cpp
         Platform/ProcessStatisticsLinux.cpp
diff --git a/Libraries/LibCore/System.cpp b/Libraries/LibCore/System.cpp
index c8ed6b3cbc2..bece7db94f9 100644
--- a/Libraries/LibCore/System.cpp
+++ b/Libraries/LibCore/System.cpp
@@ -164,7 +164,7 @@ ErrorOr<int> anon_create([[maybe_unused]] size_t size, [[maybe_unused]] int opti
         TRY(close(fd));
         return Error::from_errno(saved_errno);
     }
-#elif defined(AK_OS_BSD_GENERIC) || defined(AK_OS_EMSCRIPTEN) || defined(AK_OS_HAIKU)
+#elif defined(AK_OS_BSD_GENERIC) || defined(AK_OS_HAIKU)
     static size_t shared_memory_id = 0;
 
     auto name = ByteString::formatted("/shm-{}-{}", getpid(), shared_memory_id++);
@@ -807,8 +807,6 @@ ErrorOr<ByteString> current_executable_path()
     if (sizeof(info.name) > sizeof(path))
         return Error::from_errno(ENAMETOOLONG);
     strlcpy(path, info.name, sizeof(path) - 1);
-#elif defined(AK_OS_EMSCRIPTEN)
-    return Error::from_string_literal("current_executable_path() unknown on this platform");
 #else
 #    warning "Not sure how to get current_executable_path on this platform!"
     // GetModuleFileName on Windows, unsure about OpenBSD.
diff --git a/Meta/Lagom/CMakeLists.txt b/Meta/Lagom/CMakeLists.txt
index c6793327fba..cd771776491 100644
--- a/Meta/Lagom/CMakeLists.txt
+++ b/Meta/Lagom/CMakeLists.txt
@@ -82,12 +82,6 @@ include(lagom_compile_options)
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
-if (EMSCRIPTEN)
-    set(CMAKE_EXECUTABLE_SUFFIX ".js")
-    add_cxx_compile_options(-gsource-map)
-    add_cxx_link_options(--emrun "SHELL:-s ALLOW_MEMORY_GROWTH")
-endif()
-
 if (ENABLE_COMPILETIME_FORMAT_CHECK)
     add_compile_definitions(ENABLE_COMPILETIME_FORMAT_CHECK)
 endif()
diff --git a/Utilities/CMakeLists.txt b/Utilities/CMakeLists.txt
index dedc30e88fb..d17950bb030 100644
--- a/Utilities/CMakeLists.txt
+++ b/Utilities/CMakeLists.txt
@@ -35,7 +35,7 @@ if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
     )
 endif()
 
-if (ASSERT_FAIL_HAS_INT OR EMSCRIPTEN)
+if (ASSERT_FAIL_HAS_INT)
     target_compile_definitions(test262-runner PRIVATE ASSERT_FAIL_HAS_INT)
 endif()
 
diff --git a/Utilities/test262-runner.cpp b/Utilities/test262-runner.cpp
index 69753f2d905..3df3c194a50 100644
--- a/Utilities/test262-runner.cpp
+++ b/Utilities/test262-runner.cpp
@@ -24,7 +24,7 @@
 #include <signal.h>
 #include <unistd.h>
 
-#if !defined(AK_OS_MACOS) && !defined(AK_OS_EMSCRIPTEN) && !defined(AK_OS_GNU_HURD)
+#if !defined(AK_OS_MACOS) && !defined(AK_OS_GNU_HURD)
 // Only used to disable core dumps
 #    include <sys/prctl.h>
 #endif
@@ -589,7 +589,7 @@ int main(int argc, char** argv)
 #ifdef AK_OS_GNU_HURD
     if (disable_core_dumping)
         setenv("CRASHSERVER", "/servers/crash-kill", true);
-#elif !defined(AK_OS_MACOS) && !defined(AK_OS_EMSCRIPTEN)
+#elif !defined(AK_OS_MACOS)
     if (disable_core_dumping && prctl(PR_SET_DUMPABLE, 0, 0, 0) < 0) {
         perror("prctl(PR_SET_DUMPABLE)");
         return exit_wrong_arguments;