diff --git a/eng/Subsets.props b/eng/Subsets.props
index 2b51f1973c367c..d9a4436f767e36 100644
--- a/eng/Subsets.props
+++ b/eng/Subsets.props
@@ -39,7 +39,7 @@
   <PropertyGroup>
     <DefaultSubsets>clr+mono+libs+installer</DefaultSubsets>
     <DefaultSubsets Condition="'$(TargetsMobile)' == 'true'">mono+libs+installer</DefaultSubsets>
-    <DefaultSubsets Condition="'$(TargetOS)' == 'WebAssembly'">mono+libs</DefaultSubsets>
+    <DefaultSubsets Condition="'$(TargetOS)' == 'Browser'">mono+libs</DefaultSubsets>
   </PropertyGroup>
 
   <!-- Init _subset here in to allow RuntimeFlavor to be set as early as possible -->
@@ -49,7 +49,7 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <RuntimeFlavor Condition="'$(TargetsMobile)' == 'true' or '$(TargetOS)' == 'WebAssembly'">Mono</RuntimeFlavor>
+    <RuntimeFlavor Condition="'$(TargetsMobile)' == 'true' or '$(TargetOS)' == 'Browser'">Mono</RuntimeFlavor>
     <RuntimeFlavor Condition="'$(RuntimeFlavor)' == '' and ($(_subset.Contains('+mono+')) or $(_subset.Contains('+mono.runtime+'))) and (!$(_subset.Contains('+clr+')) and !$(_subset.Contains('+clr.runtime+')))">Mono</RuntimeFlavor>
     <RuntimeFlavor Condition="'$(RuntimeFlavor)' == ''">CoreCLR</RuntimeFlavor>
   </PropertyGroup>
diff --git a/eng/build.sh b/eng/build.sh
index 5f297babbf8392..911757dcefeb53 100755
--- a/eng/build.sh
+++ b/eng/build.sh
@@ -18,7 +18,7 @@ usage()
 {
   echo "Common settings:"
   echo "  --subset                   Build a subset, print available subsets with -subset help (short: -s)"
-  echo "  --os                       Build operating system: Windows_NT, Linux, FreeBSD, OSX, tvOS, iOS, Android or WebAssembly"
+  echo "  --os                       Build operating system: Windows_NT, Linux, FreeBSD, OSX, tvOS, iOS, Android or Browser"
   echo "  --arch                     Build platform: x86, x64, arm, armel, arm64 or wasm"
   echo "  --configuration            Build configuration: Debug, Release or [CoreCLR]Checked (short: -c)"
   echo "  --runtimeConfiguration     Runtime build configuration: Debug, Release or [CoreCLR]Checked (short: -rc)"
diff --git a/eng/native/init-distro-rid.sh b/eng/native/init-distro-rid.sh
index 9c3491d75664c4..22efd8e8b5423f 100644
--- a/eng/native/init-distro-rid.sh
+++ b/eng/native/init-distro-rid.sh
@@ -137,7 +137,7 @@ initDistroRidGlobal()
     initNonPortableDistroRid "${targetOs}" "${buildArch}" "${isPortable}" "${rootfsDir}"
 
     if [ "$buildArch" = "wasm" ]; then
-        __DistroRid=WebAssembly-wasm
+        __DistroRid=browser-wasm
         export __DistroRid
     fi
 
@@ -165,8 +165,8 @@ initDistroRidGlobal()
                 distroRid="ios-$buildArch"
             elif [ "$targetOs" = "Android" ]; then
                 distroRid="android-$buildArch"
-            elif [ "$targetOs" = "WebAssembly" ]; then
-                distroRid="wasm-$buildArch"
+            elif [ "$targetOs" = "Browser" ]; then
+                distroRid="browser-$buildArch"
             elif [ "$targetOs" = "FreeBSD" ]; then
                 distroRid="freebsd-$buildArch"
             elif [ "$targetOs" = "SunOS" ]; then
diff --git a/eng/pipelines/common/platform-matrix.yml b/eng/pipelines/common/platform-matrix.yml
index 1f6c14be291483..1250c0910af462 100644
--- a/eng/pipelines/common/platform-matrix.yml
+++ b/eng/pipelines/common/platform-matrix.yml
@@ -160,14 +160,14 @@ jobs:
 
 # WebAssembly
 
-- ${{ if containsValue(parameters.platforms, 'WebAssembly_wasm') }}:
+- ${{ if containsValue(parameters.platforms, 'Browser_wasm') }}:
   - template: xplat-setup.yml
     parameters:
       jobTemplate: ${{ parameters.jobTemplate }}
       helixQueuesTemplate: ${{ parameters.helixQueuesTemplate }}
-      osGroup: WebAssembly
+      osGroup: Browser
       archType: wasm
-      platform: WebAssembly_wasm
+      platform: Browser_wasm
       container:
         image: ubuntu-18.04-webassembly-20200409132031-f70ea41
         registry: mcr
diff --git a/eng/pipelines/libraries/base-job.yml b/eng/pipelines/libraries/base-job.yml
index 503b30c5bd3dee..2793183d99ae6a 100644
--- a/eng/pipelines/libraries/base-job.yml
+++ b/eng/pipelines/libraries/base-job.yml
@@ -64,7 +64,7 @@ jobs:
           - _runtimeOSArg: /p:RuntimeOS=ubuntu.16.04
 
         # force a value for OS when cross-building
-        - ${{ if in(parameters.osGroup, 'WebAssembly', 'iOS', 'tvOS', 'Android', 'FreeBSD') }}:
+        - ${{ if in(parameters.osGroup, 'Browser', 'iOS', 'tvOS', 'Android', 'FreeBSD') }}:
           - _runtimeOSArg: -os ${{ parameters.osGroup }}
 
         - ${{ if ne(parameters.framework, '') }}:
diff --git a/eng/pipelines/libraries/build-job.yml b/eng/pipelines/libraries/build-job.yml
index c541e688803d21..c28f1db03525b2 100644
--- a/eng/pipelines/libraries/build-job.yml
+++ b/eng/pipelines/libraries/build-job.yml
@@ -57,7 +57,7 @@ jobs:
         - _subset: libs
         - _additionalBuildArguments: ''
         - ${{ parameters.variables }}
-        - ${{ if eq(parameters.osGroup, 'WebAssembly') }}:
+        - ${{ if eq(parameters.osGroup, 'Browser') }}:
           - EMSDK_PATH: /usr/local/emscripten
         # for coreclr library builds (when not testing) build corelib as well.   
         - ${{ if and(eq(parameters.runtimeFlavor, 'coreclr'), eq(parameters.testScope, '')) }}:
diff --git a/eng/pipelines/mono/templates/build-job.yml b/eng/pipelines/mono/templates/build-job.yml
index 7c18a08e1f8cec..e7ce2b964d663d 100644
--- a/eng/pipelines/mono/templates/build-job.yml
+++ b/eng/pipelines/mono/templates/build-job.yml
@@ -74,13 +74,13 @@ jobs:
     - ${{ if eq(parameters.osGroup, 'Android') }}:
       - name: osOverride
         value: -os Android
-    - ${{ if eq(parameters.osGroup, 'WebAssembly') }}:
+    - ${{ if eq(parameters.osGroup, 'Browser') }}:
       - name: EMSDK_PATH
         value: /usr/local/emscripten
       - name: archType
         value: wasm
       - name: osOverride
-        value: '-os WebAssembly'
+        value: '-os Browser'
     - ${{ parameters.variables }}
 
     steps:
diff --git a/eng/pipelines/runtime-official.yml b/eng/pipelines/runtime-official.yml
index 0926b28f1eb6c9..a4c5ffc3bf529e 100644
--- a/eng/pipelines/runtime-official.yml
+++ b/eng/pipelines/runtime-official.yml
@@ -83,6 +83,7 @@ stages:
       - Linux_arm
       - Linux_arm64
       - Linux_musl_x64
+      - Browser_wasm
       # - Linux_musl_arm64
       - Windows_NT_x64
       # - Windows_NT_x86
@@ -131,6 +132,7 @@ stages:
       - iOS_x64
       # - iOS_arm # https://github.com/dotnet/runtime/issues/34465
       - iOS_arm64
+      - Browser_wasm
       jobParameters:
         isOfficialBuild: ${{ variables.isOfficialBuild }}
         liveRuntimeBuildConfig: release
diff --git a/eng/pipelines/runtime.yml b/eng/pipelines/runtime.yml
index 9f2a2ed20f6ddf..faa41858eb9626 100644
--- a/eng/pipelines/runtime.yml
+++ b/eng/pipelines/runtime.yml
@@ -246,7 +246,7 @@ jobs:
     - Linux_arm
     - Linux_arm64
     - Linux_musl_x64
-    - WebAssembly_wasm
+    - Browser_wasm
     # - Linux_musl_arm64
     - Windows_NT_x64
     # - Windows_NT_x86
@@ -283,7 +283,7 @@ jobs:
     - Linux_arm
     - Linux_arm64
     - Linux_musl_x64
-    - WebAssembly_wasm
+    - Browser_wasm
     # - Linux_musl_arm64
     - Windows_NT_x64
     # - Windows_NT_x86
@@ -412,7 +412,7 @@ jobs:
     - Android_arm64
     - tvOS_x64
     - iOS_arm64
-    - WebAssembly_wasm
+    - Browser_wasm
     jobParameters:
       liveRuntimeBuildConfig: debug
 
diff --git a/src/libraries/Directory.Build.props b/src/libraries/Directory.Build.props
index bc645f5ca21a44..f79904eea5ae95 100644
--- a/src/libraries/Directory.Build.props
+++ b/src/libraries/Directory.Build.props
@@ -34,13 +34,13 @@
     <HostArch>$([System.Runtime.InteropServices.RuntimeInformation]::ProcessArchitecture.ToString().ToLowerInvariant)</HostArch>
     <TargetArchitecture Condition="'$(TargetArchitecture)' == '' and '$(HostArch)' == 'arm'">arm</TargetArchitecture>
     <TargetArchitecture Condition="'$(TargetArchitecture)' == '' and '$(HostArch)' == 'arm64'">arm64</TargetArchitecture>
-    <TargetArchitecture Condition="'$(TargetArchitecture)' == '' and '$(TargetOS)' == 'WebAssembly'">wasm</TargetArchitecture>
+    <TargetArchitecture Condition="'$(TargetArchitecture)' == '' and '$(TargetOS)' == 'Browser'">wasm</TargetArchitecture>
     <TargetArchitecture Condition="'$(TargetArchitecture)' == '' and '$(TargetsMobile)' == 'true'">x64</TargetArchitecture>
     <TargetArchitecture Condition="'$(TargetArchitecture)' == ''">x64</TargetArchitecture>
 
     <!-- RuntimeOS is calculated based on the build system OS, however if building for WebAssembly/iOS/Android we need to let
          the build system to use webassembly/ios/android as the RuntimeOS for produced package RIDs. -->
-    <RuntimeOS Condition="'$(TargetOS)' == 'WebAssembly' or '$(TargetsMobile)' == 'true'">$(TargetOS.ToLowerInvariant())</RuntimeOS>
+    <RuntimeOS Condition="'$(TargetOS)' == 'Browser' or '$(TargetsMobile)' == 'true'">$(TargetOS.ToLowerInvariant())</RuntimeOS>
  
     <!-- Initialize BuildSettings from the individual properties if it wasn't already explicitly set -->
     <Configuration Condition="'$(Configuration)'==''">Debug</Configuration>
@@ -94,7 +94,7 @@
     <_portableOS Condition="'$(_runtimeOSFamily)' == 'win' or '$(TargetOS)' == 'Windows_NT'">win</_portableOS>
     <_portableOS Condition="'$(_runtimeOSFamily)' == 'osx'">osx</_portableOS>
     <_portableOS Condition="'$(_runtimeOSFamily)' == 'FreeBSD'">freebsd</_portableOS>
-    <_portableOS Condition="'$(RuntimeOS)' == 'WebAssembly'">webassembly</_portableOS>
+    <_portableOS Condition="'$(RuntimeOS)' == 'Browser'">browser</_portableOS>
     <_portableOS Condition="'$(RuntimeOS)' == 'ios'">ios</_portableOS>
     <_portableOS Condition="'$(RuntimeOS)' == 'tvos'">tvos</_portableOS>
     <_portableOS Condition="'$(RuntimeOS)' == 'android'">android</_portableOS>
@@ -110,9 +110,9 @@
 
     <!-- There are no WebAssembly tools, so use the default ones -->
     <_buildingInOSX>$([MSBuild]::IsOSPlatform('OSX'))</_buildingInOSX>
-    <ToolRuntimeRID Condition="'$(RuntimeOS)' == 'webassembly' and '$(TargetOS)' == 'Windows_NT'">win-x64</ToolRuntimeRID>
-    <ToolRuntimeRID Condition="'$(RuntimeOS)' == 'webassembly' and '$(TargetOS)' != 'Windows_NT' and $(_buildingInOSX)">osx-x64</ToolRuntimeRID>
-    <ToolRuntimeRID Condition="'$(RuntimeOS)' == 'webassembly' and '$(TargetOS)' != 'Windows_NT' and !$(_buildingInOSX)">linux-x64</ToolRuntimeRID>
+    <ToolRuntimeRID Condition="'$(RuntimeOS)' == 'browser' and '$(TargetOS)' == 'Windows_NT'">win-x64</ToolRuntimeRID>
+    <ToolRuntimeRID Condition="'$(RuntimeOS)' == 'browser' and '$(TargetOS)' != 'Windows_NT' and $(_buildingInOSX)">osx-x64</ToolRuntimeRID>
+    <ToolRuntimeRID Condition="'$(RuntimeOS)' == 'browser' and '$(TargetOS)' != 'Windows_NT' and !$(_buildingInOSX)">linux-x64</ToolRuntimeRID>
 
     <!-- There are no Android tools, so use the default ones -->
     <ToolRuntimeRID Condition="'$(RuntimeOS)' == 'android' and '$(TargetOS)' == 'Windows_NT'">win-x64</ToolRuntimeRID>
diff --git a/src/libraries/Native/build-native.cmd b/src/libraries/Native/build-native.cmd
index f59b71c0819bbe..87f78148dfaa38 100644
--- a/src/libraries/Native/build-native.cmd
+++ b/src/libraries/Native/build-native.cmd
@@ -32,7 +32,7 @@ if /i [%1] == [wasm]        ( set __BuildArch=wasm&&set __VCBuildArch=x86_amd64&
 
 if /i [%1] == [outconfig] ( set __outConfig=%2&&shift&&shift&goto Arg_Loop)
 
-if /i [%1] == [WebAssembly] ( set __TargetOS=WebAssembly&&shift&goto Arg_Loop)
+if /i [%1] == [Browser] ( set __TargetOS=Browser&&shift&goto Arg_Loop)
 
 if /i [%1] == [rebuild] ( set __BuildTarget=rebuild&&shift&goto Arg_Loop)
 
diff --git a/src/libraries/OSGroups.json b/src/libraries/OSGroups.json
index 062533affcfd73..6b26bd7e2aecf6 100644
--- a/src/libraries/OSGroups.json
+++ b/src/libraries/OSGroups.json
@@ -2,7 +2,7 @@
   "runtimes": {
     "Unix" : {      
     },
-    "WebAssembly" : {
+    "Browser" : {
       "#import": [
         "Linux"
       ]
diff --git a/src/libraries/targetframework.props b/src/libraries/targetframework.props
index 6f55f1411fd081..79e842c28d1835 100644
--- a/src/libraries/targetframework.props
+++ b/src/libraries/targetframework.props
@@ -62,7 +62,7 @@
         <PackageTargetRuntime>netbsd</PackageTargetRuntime>
       </PropertyGroup>
     </When>
-    <When Condition="'$(TargetFrameworkSuffix)' == 'WebAssembly'">
+    <When Condition="'$(TargetFrameworkSuffix)' == 'Browser'">
       <PropertyGroup>
         <TargetsLinux>true</TargetsLinux>
         <TargetsWebAssembly>true</TargetsWebAssembly>
diff --git a/src/mono/Directory.Build.props b/src/mono/Directory.Build.props
index fed776d063ff34..abca96550037c1 100644
--- a/src/mono/Directory.Build.props
+++ b/src/mono/Directory.Build.props
@@ -42,7 +42,7 @@
     <TargetsiOSSimulator Condition="'$(TargetsiOS)' == 'true' and '$(Platform)' == 'x64'">true</TargetsiOSSimulator>
     <TargetstvOSSimulator Condition="'$(TargetstvOS)' == 'true' and '$(Platform)' == 'x64'">true</TargetstvOSSimulator>
     <TargetsAndroid Condition="'$(TargetOS)' == 'Android'">true</TargetsAndroid>
-    <TargetsWASM Condition="'$(TargetOS)' == 'WebAssembly'">true</TargetsWASM>
+    <TargetsWASM Condition="'$(TargetOS)' == 'Browser'">true</TargetsWASM>
     <TargetsWindows Condition="'$(TargetOS)' == 'Windows_NT'">true</TargetsWindows>
     <TargetsUnix Condition="'$(TargetsFreeBSD)' == 'true' or '$(TargetsLinux)' == 'true' or '$(TargetsNetBSD)' == 'true' or '$(TargetsOSX)' == 'true' or '$(TargetstvOS)' == 'true' or '$(TargetsiOS)' == 'true' or '$(TargetsAndroid)' == 'true' or '$(TargetsWASM)' == 'true'">true</TargetsUnix>
   </PropertyGroup>