diff --git a/tools/cpp/BUILD b/tools/cpp/BUILD
index d2e2fda..c2c285d 100644
--- a/tools/cpp/BUILD
+++ b/tools/cpp/BUILD
@@ -12,6 +12,7 @@
         "//tools:has_tsan": [],
         "//tools:cpu_cortex_m4f": [],
         "//tools:cpu_cortex_m4f_k22": [],
+        "//tools:cpu_web": [],
         "//conditions:default": ["//third_party/gperftools:tcmalloc"],
     }),
 )
@@ -34,6 +35,7 @@
         "armhf-debian|clang": "cc-compiler-armhf-debian",
         "cortex-m4f|gcc": "cc-compiler-cortex-m4f",
         "cortex-m4f-k22|gcc": "cc-compiler-cortex-m4f-k22",
+        "web|emscripten": "//tools/cpp/emscripten:cc_emscripten",
     },
 )
 
diff --git a/tools/cpp/CROSSTOOL b/tools/cpp/CROSSTOOL
index c7a846f..75110f4 100644
--- a/tools/cpp/CROSSTOOL
+++ b/tools/cpp/CROSSTOOL
@@ -16,6 +16,10 @@
   toolchain_identifier: "stub_armeabi-v7a"
 }
 default_toolchain {
+  cpu: "web"
+  toolchain_identifier: "emscripten_toolchain"
+}
+default_toolchain {
   cpu: "armhf-debian"
   toolchain_identifier: "clang_linux_armhf"
 }
@@ -330,6 +334,153 @@
   }
 }
 toolchain {
+  toolchain_identifier: "emscripten_toolchain"
+  host_system_name: "web"
+  target_system_name: "emscripten-unknown-emscripten"
+  target_cpu: "web"
+  target_libc: "unknown"
+  compiler: "emscripten"
+  abi_version: "unknown"
+  abi_libc_version: "unknown"
+  tool_path {
+    name: "gcc"
+    path: "emscripten/emcc.sh"
+  }
+  tool_path {
+    name: "ld"
+    path: "emscripten/emcc.sh"
+  }
+  tool_path {
+    name: "ar"
+    path: "emscripten/emar.sh"
+  }
+  tool_path {
+    name: "cpp"
+    path: "/bin/false"
+  }
+  tool_path {
+    name: "gcov"
+    path: "/bin/false"
+  }
+  tool_path {
+    name: "nm"
+    path: "/bin/false"
+  }
+  tool_path {
+    name: "objdump"
+    path: "/bin/false"
+  }
+  tool_path {
+    name: "objcopy"
+    path: "/bin/false"
+  }
+  tool_path {
+    name: "strip"
+    path: "/bin/false"
+  }
+  compiler_flag: "-isystem"
+  compiler_flag: "external/emscripten_toolchain/system/include"
+  compiler_flag: "-fno-exceptions"
+  compiler_flag: "-fdiagnostics-color=always"
+  compiler_flag: "-Wall"
+  compiler_flag: "-Werror"
+  compiler_flag: "-ffunction-sections"
+  compiler_flag: "-fdata-sections"
+  linker_flag: "-no-canonical-prefixes"
+  unfiltered_cxx_flag: "-isystem"
+  unfiltered_cxx_flag: "external/emscripten_toolchain/system/include/libcxx"
+  unfiltered_cxx_flag: "-isystem"
+  unfiltered_cxx_flag: "external/emscripten_toolchain/system/lib/libcxxabi/include"
+  unfiltered_cxx_flag: "-isystem"
+  unfiltered_cxx_flag: "external/emscripten_toolchain/system/include/compat"
+  unfiltered_cxx_flag: "-isystem"
+  unfiltered_cxx_flag: "external/emscripten_toolchain/system/include"
+  unfiltered_cxx_flag: "-isystem"
+  unfiltered_cxx_flag: "external/emscripten_toolchain/system/include/SSE"
+  unfiltered_cxx_flag: "-isystem"
+  unfiltered_cxx_flag: "external/emscripten_toolchain/system/include/libc"
+  unfiltered_cxx_flag: "-isystem"
+  unfiltered_cxx_flag: "external/emscripten_toolchain/system/lib/libc/musl/arch/emscripten"
+  unfiltered_cxx_flag: "-isystem"
+  unfiltered_cxx_flag: "external/emscripten_toolchain/system/local/include"
+  unfiltered_cxx_flag: "-no-canonical-prefixes"
+  unfiltered_cxx_flag: "-Wno-builtin-macro-redefined"
+  unfiltered_cxx_flag: "-D__DATE__=\"redacted\""
+  unfiltered_cxx_flag: "-D__TIMESTAMP__=\"redacted\""
+  unfiltered_cxx_flag: "-D__TIME__=\"redacted\""
+  feature {
+    name: "opt"
+    flag_set {
+      action: "preprocess-assemble"
+      action: "c-compile"
+      action: "c++-compile"
+      action: "c++-header-parsing"
+      action: "c++-header-preprocessing"
+      action: "c++-module-compile"
+      flag_group {
+        flag: "-DAOS_DEBUG=0"
+        flag: "-O2"
+        flag: "--closure"
+        flag: "1"
+      }
+    }
+    implies: "all_modes"
+  }
+  feature {
+    name: "dbg"
+    flag_set {
+      action: "preprocess-assemble"
+      action: "c-compile"
+      action: "c++-compile"
+      action: "c++-header-parsing"
+      action: "c++-header-preprocessing"
+      action: "c++-module-compile"
+      flag_group {
+        flag: "-DAOS_DEBUG=1"
+      }
+      flag_group {
+        flag: "-fno-omit-frame-pointer"
+      }
+    }
+    implies: "all_modes"
+  }
+  feature {
+    name: "fastbuild"
+    flag_set {
+      action: "preprocess-assemble"
+      action: "c-compile"
+      action: "c++-compile"
+      action: "c++-header-parsing"
+      action: "c++-header-preprocessing"
+      action: "c++-module-compile"
+      flag_group {
+        flag: "-DAOS_DEBUG=0"
+      }
+    }
+    implies: "all_modes"
+  }
+  feature {
+    name: "all_modes"
+    flag_set {
+      action: "preprocess-assemble"
+      action: "assemble"
+      action: "c-compile"
+      flag_group {
+        flag: "-std=gnu99"
+      }
+    }
+    flag_set {
+      action: "c++-compile"
+      action: "c++-header-parsing"
+      action: "c++-header-preprocessing"
+      action: "c++-module-compile"
+      flag_group {
+        flag: "-std=gnu++1y"
+      }
+    }
+  }
+}
+toolchain {
   toolchain_identifier: "roborio_linux"
   host_system_name: "roborio"
   target_system_name: "roborio"
diff --git a/tools/cpp/emscripten/BUILD b/tools/cpp/emscripten/BUILD
new file mode 100644
index 0000000..dd304e1
--- /dev/null
+++ b/tools/cpp/emscripten/BUILD
@@ -0,0 +1,38 @@
+package(default_visibility = ["//visibility:public"])
+
+filegroup(
+    name = "all",
+    srcs = [
+        "emar.sh",
+        "emcc.sh",
+        ":emscripten_cache_content",
+        "@emscripten_clang//:all",
+        "@emscripten_toolchain//:all",
+        "@nodejs//:bin/node",
+    ],
+)
+
+# TODO(james): There is a set of static files that emscripten will always
+# attempt to either rebuild or source from a cache. Ideally, we would make
+# the build of these files part of the normal build process; however, the
+# emscripten compiler handles sandboxing poorly for these files and so it
+# is simplest to just manually run emscripten outside of the sandbox and
+# copy over the cache folder for now.
+filegroup(
+    name = "emscripten_cache_content",
+    srcs = glob(["emscripten_cache/**/*"]),
+)
+
+cc_toolchain(
+    name = "cc_emscripten",
+    all_files = ":all",
+    compiler_files = ":all",
+    cpu = "web",
+    dwp_files = ":empty",
+    dynamic_runtime_libs = [":empty"],
+    linker_files = ":all",
+    objcopy_files = ":empty",
+    static_runtime_libs = [":empty"],
+    strip_files = ":empty",
+    supports_param_files = 0,
+)
diff --git a/tools/cpp/emscripten/defs.bzl b/tools/cpp/emscripten/defs.bzl
new file mode 100644
index 0000000..721e895
--- /dev/null
+++ b/tools/cpp/emscripten/defs.bzl
@@ -0,0 +1,51 @@
+# Sourced from https://github.com/ribrdb/rules_emscripten/blob/master/toolchain/defs.bzl
+# TODO(james): Specialize this more for our purposes--e.g.,
+# we probably will only actually use one set of the possible options.
+def emcc_binary(name,
+                memory_init_file=0,
+                wasm=True,
+                worker=False,
+                linkopts=[],
+                **kwargs):
+    includejs = False
+    includehtml = False
+    linkopts = list(linkopts)
+    if name.endswith(".html"):
+        basename = name[:-5]
+        includehtml = True
+        includejs = True
+    elif name.endswith(".js"):
+        basename = name[:-3]
+        includejs = True
+    outputs = []
+    if includejs:
+        outputs.append(basename + ".js")
+        if wasm:
+            outputs.append(basename + ".wasm")
+        if memory_init_file:
+            outputs.append(basename + ".mem")
+        if worker:
+            outputs.append(basename + ".worker.js")
+            linkopts.append('--proxy-to-worker')
+
+    if includehtml:
+        outputs.append(basename + ".html")
+    if not wasm:
+        linkopts.append('-s WASM=0')
+        linkopts.append('--memory-init-file %d' % memory_init_file)
+    if includejs:
+        tarfile = name + ".tar"
+        # we'll generate a tarfile and extract multiple outputs
+        native.cc_binary(name=tarfile, linkopts=linkopts, restricted_to = ["//tools:web"], **kwargs)
+        native.genrule(
+            name="emcc_extract_" + tarfile,
+            srcs=[tarfile],
+            outs=outputs,
+            output_to_bindir=1,
+            testonly=kwargs.get('testonly'),
+            restricted_to = ["//tools:web"],
+            cmd="""
+          tar xf $< -C "$(@D)"/$$(dirname "%s")
+        """ % [outputs[0]])
+    else:
+        native.cc_binary(name=name, linkopts=linkopts, restricted_to = ["//tools:web"], **kwargs)
diff --git a/tools/cpp/emscripten/emar.sh b/tools/cpp/emscripten/emar.sh
new file mode 100755
index 0000000..a94fb0b
--- /dev/null
+++ b/tools/cpp/emscripten/emar.sh
@@ -0,0 +1,21 @@
+#!/bin/bash
+# Originally sourced from https://github.com/ribrdb/rules_emscripten
+set -euo pipefail
+EM_CONFIG="LLVM_ROOT='external/emscripten_clang';"
+EM_CONFIG+="EMSCRIPTEN_NATIVE_OPTIMIZER='external/emscripten_clang/optimizer';"
+EM_CONFIG+="BINARYEN_ROOT='external/emscripten_clang/binaryen';"
+EM_CONFIG+="NODE_JS='external/nodejs/bin/node';"
+EM_CONFIG+="EMSCRIPTEN_ROOT='external/emscripten_toolchain';"
+EM_CONFIG+="SPIDERMONKEY_ENGINE='';"
+EM_CONFIG+="V8_ENGINE='';"
+EM_CONFIG+="TEMP_DIR='tmp';"
+EM_CONFIG+="COMPILER_ENGINE=NODE_JS;"
+EM_CONFIG+="JS_ENGINES=[NODE_JS];"
+export EM_CONFIG
+
+export EM_EXCLUSIVE_CACHE_ACCESS=1
+export EMCC_SKIP_SANITY_CHECK=1
+export EMCC_WASM_BACKEND=0
+export EMMAKEN_NO_SDK=1
+
+python external/emscripten_toolchain/emar.py "$@"
diff --git a/tools/cpp/emscripten/emcc.sh b/tools/cpp/emscripten/emcc.sh
new file mode 100755
index 0000000..52ed893
--- /dev/null
+++ b/tools/cpp/emscripten/emcc.sh
@@ -0,0 +1,65 @@
+#!/bin/bash
+# Originally sourced from https://github.com/ribrdb/rules_emscripten
+set -euo pipefail
+EM_CONFIG="LLVM_ROOT='$(pwd -P)/external/emscripten_clang';"
+EM_CONFIG+="EMSCRIPTEN_NATIVE_OPTIMIZER='external/emscripten_clang/optimizer';"
+EM_CONFIG+="BINARYEN_ROOT='external/emscripten_clang/binaryen';"
+EM_CONFIG+="NODE_JS='$(pwd -P)/external/nodejs/bin/node';"
+EM_CONFIG+="EMSCRIPTEN_ROOT='external/emscripten_toolchain';"
+EM_CONFIG+="SPIDERMONKEY_ENGINE='';"
+EM_CONFIG+="V8_ENGINE='';"
+EM_CONFIG+="TEMP_DIR='tmp';"
+EM_CONFIG+="COMPILER_ENGINE=NODE_JS;"
+EM_CONFIG+="JS_ENGINES=[NODE_JS];"
+export EM_CONFIG
+
+export EM_EXCLUSIVE_CACHE_ACCESS=1
+export EMCC_SKIP_SANITY_CHECK=1
+# export EMCC_DEBUG=2
+export EMCC_WASM_BACKEND=0
+export EMMAKEN_NO_SDK=1
+
+mkdir -p "tmp/emscripten_cache"
+export EM_CACHE="$(pwd -P)/tmp/emscripten_cache"
+export EMCC_TEMP_DIR="$(pwd -P)/tmp"
+
+# Prepare the cache content so emscripten doesn't try to rebuild it all the time
+cache_source=tools/cpp/emscripten/emscripten_cache
+if [ -d toolchain/emscripten_cache ]; then
+  cache_source=toolchain/emscripten_cache
+elif [ -d external/rules_emscripten/toolchain/emscripten_cache ]; then
+  cache_source=external/rules_emscripten/toolchain/emscripten_cache
+fi
+(
+  cd tmp/emscripten_cache;
+  for n in "../../$cache_source"/*;do
+    ln -s "$n"
+  done
+)
+
+argv=("$@")
+tarfile=
+# Find the -o option, and strip the .tar from it.
+for (( i=0; i<$#; i++ )); do
+  if [[ "x${argv[i]}" == x-o ]]; then
+    arg=${argv[$((i+1))]}
+    if [[ "x$arg" == x*.tar ]];then
+        tarfile="$(cd $(dirname "$arg"); pwd -P)/$(basename "$arg")"
+        emfile="$(dirname "$arg")/$(basename $arg .tar)"
+        basearg="$(basename "$(basename "$(basename "$emfile" .js)" .html)" .wasm)"
+        baseout="$(dirname "$arg")/$basearg"
+        argv[$((i+1))]="$emfile"
+    fi
+  fi
+done
+python external/emscripten_toolchain/emcc.py "${argv[@]}"
+# Now create the tarfile
+shopt -s extglob
+if [ "x$tarfile" != x ]; then
+  outdir="$(dirname "$baseout")"
+  outbase="$(basename "$baseout")"
+  (
+      cd "$outdir";
+      tar cf "$tarfile" "$outbase."?(html|js|wasm|mem|data|worker.js)
+  )
+fi
diff --git a/tools/cpp/emscripten/emscripten_cache/asmjs/binaryen_tag_version_82.txt b/tools/cpp/emscripten/emscripten_cache/asmjs/binaryen_tag_version_82.txt
new file mode 100644
index 0000000..01e1f09
--- /dev/null
+++ b/tools/cpp/emscripten/emscripten_cache/asmjs/binaryen_tag_version_82.txt
@@ -0,0 +1 @@
+version_82
\ No newline at end of file
diff --git a/tools/cpp/emscripten/emscripten_cache/asmjs/generated_struct_info.json b/tools/cpp/emscripten/emscripten_cache/asmjs/generated_struct_info.json
new file mode 100644
index 0000000..1e636fd
--- /dev/null
+++ b/tools/cpp/emscripten/emscripten_cache/asmjs/generated_struct_info.json
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diff --git a/tools/cpp/emscripten/emscripten_cache/asmjs/libc-wasm.bc b/tools/cpp/emscripten/emscripten_cache/asmjs/libc-wasm.bc
new file mode 100644
index 0000000..50f7172
--- /dev/null
+++ b/tools/cpp/emscripten/emscripten_cache/asmjs/libc-wasm.bc
Binary files differ
diff --git a/tools/cpp/emscripten/emscripten_cache/asmjs/libc.bc b/tools/cpp/emscripten/emscripten_cache/asmjs/libc.bc
new file mode 100644
index 0000000..7f4adf9
--- /dev/null
+++ b/tools/cpp/emscripten/emscripten_cache/asmjs/libc.bc
Binary files differ
diff --git a/tools/cpp/emscripten/emscripten_cache/asmjs/libcompiler_rt.a b/tools/cpp/emscripten/emscripten_cache/asmjs/libcompiler_rt.a
new file mode 100644
index 0000000..9468549
--- /dev/null
+++ b/tools/cpp/emscripten/emscripten_cache/asmjs/libcompiler_rt.a
Binary files differ
diff --git a/tools/cpp/emscripten/emscripten_cache/asmjs/libdlmalloc.bc b/tools/cpp/emscripten/emscripten_cache/asmjs/libdlmalloc.bc
new file mode 100644
index 0000000..def54c3
--- /dev/null
+++ b/tools/cpp/emscripten/emscripten_cache/asmjs/libdlmalloc.bc
Binary files differ
diff --git a/tools/cpp/emscripten/emscripten_cache/asmjs/libpthreads_stub.bc b/tools/cpp/emscripten/emscripten_cache/asmjs/libpthreads_stub.bc
new file mode 100644
index 0000000..b5205d0
--- /dev/null
+++ b/tools/cpp/emscripten/emscripten_cache/asmjs/libpthreads_stub.bc
Binary files differ
diff --git a/tools/cpp/static_crosstool.pb b/tools/cpp/static_crosstool.pb
index 5599c15..6914825 100644
--- a/tools/cpp/static_crosstool.pb
+++ b/tools/cpp/static_crosstool.pb
@@ -18,6 +18,11 @@
 }
 
 default_toolchain {
+  cpu: "web"
+  toolchain_identifier: "emscripten_toolchain"
+}
+
+default_toolchain {
   cpu: "armhf-debian"
   toolchain_identifier: "clang_linux_armhf"
 }
@@ -323,6 +328,166 @@
 }
 
 toolchain {
+    # This toolchain was initially sourced from https://github.com/ribrdb/rules_emscripten
+    toolchain_identifier: "emscripten_toolchain"
+    host_system_name: "web"
+    target_system_name: "emscripten-unknown-emscripten"
+    target_cpu: "web"
+    target_libc: "unknown"
+    compiler: "emscripten"
+    abi_version: "unknown"
+    abi_libc_version: "unknown"
+    tool_path {
+      name: "gcc"
+      path: "emscripten/emcc.sh"
+    }
+    tool_path {
+        name: "ld"
+        path: "emscripten/emcc.sh"
+    }
+    tool_path {
+        name: "ar"
+        path: "emscripten/emar.sh"
+    }
+    tool_path {
+        name: "cpp"
+        path: "/bin/false"
+    }
+    tool_path {
+        name: "gcov"
+        path: "/bin/false"
+    }
+    tool_path {
+        name: "nm"
+        path: "/bin/false"
+    }
+    tool_path {
+        name: "objdump"
+        path: "/bin/false"
+    }
+    tool_path {
+      name: "objcopy"
+      path: "/bin/false"
+    }
+    tool_path {
+        name: "strip"
+        path: "/bin/false"
+    }
+
+    unfiltered_cxx_flag: "-isystem"
+    unfiltered_cxx_flag: "external/emscripten_toolchain/system/include/libcxx"
+    unfiltered_cxx_flag: "-isystem"
+    unfiltered_cxx_flag: "external/emscripten_toolchain/system/lib/libcxxabi/include"
+    unfiltered_cxx_flag: "-isystem"
+    unfiltered_cxx_flag: "external/emscripten_toolchain/system/include/compat"
+    compiler_flag: "-isystem"
+    compiler_flag: "external/emscripten_toolchain/system/include"
+    unfiltered_cxx_flag: "-isystem"
+    unfiltered_cxx_flag: "external/emscripten_toolchain/system/include"
+    unfiltered_cxx_flag: "-isystem"
+    unfiltered_cxx_flag: "external/emscripten_toolchain/system/include/SSE"
+    unfiltered_cxx_flag: "-isystem"
+    unfiltered_cxx_flag: "external/emscripten_toolchain/system/include/libc"
+    unfiltered_cxx_flag: "-isystem"
+    unfiltered_cxx_flag: "external/emscripten_toolchain/system/lib/libc/musl/arch/emscripten"
+    unfiltered_cxx_flag: "-isystem"
+    unfiltered_cxx_flag: "external/emscripten_toolchain/system/local/include"
+
+    # Turn off exceptions since emscripten has issues catching them
+    compiler_flag: "-fno-exceptions"
+
+    unfiltered_cxx_flag: "-no-canonical-prefixes"
+    linker_flag: "-no-canonical-prefixes"
+
+    # Make C++ compilation deterministic. Use linkstamping instead of these
+    # compiler symbols.
+    unfiltered_cxx_flag: "-Wno-builtin-macro-redefined"
+    unfiltered_cxx_flag: "-D__DATE__=\"redacted\""
+    unfiltered_cxx_flag: "-D__TIMESTAMP__=\"redacted\""
+    unfiltered_cxx_flag: "-D__TIME__=\"redacted\""
+    # Enable coloring even if there's no attached terminal. Bazel removes the
+    # escape sequences if --nocolor is specified.
+    compiler_flag: "-fdiagnostics-color=always"
+    compiler_flag: "-Wall"
+    compiler_flag: "-Werror"
+
+    compiler_flag: "-ffunction-sections"
+    compiler_flag: "-fdata-sections"
+
+  feature {
+    name: "opt"
+    flag_set {
+      action: "preprocess-assemble"
+      action: "c-compile"
+      action: "c++-compile"
+      action: "c++-header-parsing"
+      action: "c++-header-preprocessing"
+      action: "c++-module-compile"
+      flag_group {
+        flag: "-DAOS_DEBUG=0"
+        flag: "-O2"
+        flag: "--closure"
+        flag: "1"
+      }
+    }
+    implies: "all_modes"
+  }
+  feature {
+    name: "dbg"
+    flag_set {
+      action: "preprocess-assemble"
+      action: "c-compile"
+      action: "c++-compile"
+      action: "c++-header-parsing"
+      action: "c++-header-preprocessing"
+      action: "c++-module-compile"
+      flag_group {
+        flag: "-DAOS_DEBUG=1"
+      }
+      flag_group {
+        flag: "-fno-omit-frame-pointer"
+      }
+    }
+    implies: "all_modes"
+  }
+  feature {
+    name: "fastbuild"
+    flag_set {
+      action: "preprocess-assemble"
+      action: "c-compile"
+      action: "c++-compile"
+      action: "c++-header-parsing"
+      action: "c++-header-preprocessing"
+      action: "c++-module-compile"
+      flag_group {
+        flag: "-DAOS_DEBUG=0"
+      }
+    }
+    implies: "all_modes"
+  }
+  feature {
+    name: "all_modes"
+    flag_set {
+      action: "preprocess-assemble"
+      action: "assemble"
+      action: "c-compile"
+      flag_group {
+        flag: "-std=gnu99"
+      }
+    }
+    flag_set {
+      action: "c++-compile"
+      action: "c++-header-parsing"
+      action: "c++-header-preprocessing"
+      action: "c++-module-compile"
+      flag_group {
+        flag: "-std=gnu++1y"
+      }
+    }
+  }
+}
+
+toolchain {
   toolchain_identifier: "roborio_linux"
   host_system_name: "roborio"
   target_system_name: "roborio"