diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 737db55..8e4b925 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,6 +31,7 @@ jobs:
         os: [ubuntu-latest]
         scala: [2.12.17, 2.13.9, 3.1.3]
         java: [temurin@8, temurin@11, temurin@17]
+        project: [rootJS, rootJVM, rootNative]
         exclude:
           - scala: 2.12.17
             java: temurin@11
@@ -40,6 +41,14 @@ jobs:
             java: temurin@11
           - scala: 3.1.3
             java: temurin@17
+          - project: rootJS
+            java: temurin@11
+          - project: rootJS
+            java: temurin@17
+          - project: rootNative
+            java: temurin@11
+          - project: rootNative
+            java: temurin@17
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
@@ -112,40 +121,48 @@ jobs:
 
       - name: Check headers and formatting
         if: matrix.java == 'temurin@8'
-        run: sbt '++${{ matrix.scala }}' headerCheckAll scalafmtCheckAll 'project /' scalafmtSbtCheck
+        run: sbt 'project ${{ matrix.project }}' '++${{ matrix.scala }}' headerCheckAll scalafmtCheckAll 'project /' scalafmtSbtCheck
+
+      - name: scalaJSLink
+        if: matrix.project == 'rootJS'
+        run: sbt 'project ${{ matrix.project }}' '++${{ matrix.scala }}' Test/scalaJSLinkerResult
+
+      - name: nativeLink
+        if: matrix.project == 'rootNative'
+        run: sbt 'project ${{ matrix.project }}' '++${{ matrix.scala }}' Test/nativeLink
 
       - name: Test
-        run: sbt '++${{ matrix.scala }}' test
+        run: sbt 'project ${{ matrix.project }}' '++${{ matrix.scala }}' test
 
       - name: Check binary compatibility
         if: matrix.java == 'temurin@8'
-        run: sbt '++${{ matrix.scala }}' mimaReportBinaryIssues
+        run: sbt 'project ${{ matrix.project }}' '++${{ matrix.scala }}' mimaReportBinaryIssues
 
       - name: Generate API documentation
         if: matrix.java == 'temurin@8'
-        run: sbt '++${{ matrix.scala }}' doc
+        run: sbt 'project ${{ matrix.project }}' '++${{ matrix.scala }}' doc
 
       - name: Check scalafix lints
         if: matrix.java == 'temurin@8' && !startsWith(matrix.scala, '3.')
-        run: sbt '++${{ matrix.scala }}' 'scalafixAll --check'
+        run: sbt 'project ${{ matrix.project }}' '++${{ matrix.scala }}' 'scalafixAll --check'
 
       - name: Check unused compile dependencies
         if: matrix.java == 'temurin@8'
-        run: sbt '++${{ matrix.scala }}' unusedCompileDependenciesTest
+        run: sbt 'project ${{ matrix.project }}' '++${{ matrix.scala }}' unusedCompileDependenciesTest
 
       - name: Make target directories
         if: github.event_name != 'pull_request' && (startsWith(github.ref, 'refs/tags/v') || github.ref == 'refs/heads/main')
-        run: mkdir -p target scalatags/target project/target
+        run: mkdir -p target .js/target scalatags/.js/target .jvm/target .native/target scalatags/.native/target scalatags/.jvm/target project/target
 
       - name: Compress target directories
         if: github.event_name != 'pull_request' && (startsWith(github.ref, 'refs/tags/v') || github.ref == 'refs/heads/main')
-        run: tar cf targets.tar target scalatags/target project/target
+        run: tar cf targets.tar target .js/target scalatags/.js/target .jvm/target .native/target scalatags/.native/target scalatags/.jvm/target project/target
 
       - name: Upload target directories
         if: github.event_name != 'pull_request' && (startsWith(github.ref, 'refs/tags/v') || github.ref == 'refs/heads/main')
         uses: actions/upload-artifact@v2
         with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-${{ matrix.scala }}
+          name: target-${{ matrix.os }}-${{ matrix.java }}-${{ matrix.scala }}-${{ matrix.project }}
           path: targets.tar
 
   publish:
@@ -224,32 +241,92 @@ jobs:
             ~/Library/Caches/Coursier/v1
           key: ${{ runner.os }}-sbt-cache-v2-${{ hashFiles('**/*.sbt') }}-${{ hashFiles('project/build.properties') }}
 
-      - name: Download target directories (2.12.17)
+      - name: Download target directories (2.12.17, rootJS)
+        uses: actions/download-artifact@v2
+        with:
+          name: target-${{ matrix.os }}-${{ matrix.java }}-2.12.17-rootJS
+
+      - name: Inflate target directories (2.12.17, rootJS)
+        run: |
+          tar xf targets.tar
+          rm targets.tar
+
+      - name: Download target directories (2.12.17, rootJVM)
+        uses: actions/download-artifact@v2
+        with:
+          name: target-${{ matrix.os }}-${{ matrix.java }}-2.12.17-rootJVM
+
+      - name: Inflate target directories (2.12.17, rootJVM)
+        run: |
+          tar xf targets.tar
+          rm targets.tar
+
+      - name: Download target directories (2.12.17, rootNative)
+        uses: actions/download-artifact@v2
+        with:
+          name: target-${{ matrix.os }}-${{ matrix.java }}-2.12.17-rootNative
+
+      - name: Inflate target directories (2.12.17, rootNative)
+        run: |
+          tar xf targets.tar
+          rm targets.tar
+
+      - name: Download target directories (2.13.9, rootJS)
+        uses: actions/download-artifact@v2
+        with:
+          name: target-${{ matrix.os }}-${{ matrix.java }}-2.13.9-rootJS
+
+      - name: Inflate target directories (2.13.9, rootJS)
+        run: |
+          tar xf targets.tar
+          rm targets.tar
+
+      - name: Download target directories (2.13.9, rootJVM)
+        uses: actions/download-artifact@v2
+        with:
+          name: target-${{ matrix.os }}-${{ matrix.java }}-2.13.9-rootJVM
+
+      - name: Inflate target directories (2.13.9, rootJVM)
+        run: |
+          tar xf targets.tar
+          rm targets.tar
+
+      - name: Download target directories (2.13.9, rootNative)
+        uses: actions/download-artifact@v2
+        with:
+          name: target-${{ matrix.os }}-${{ matrix.java }}-2.13.9-rootNative
+
+      - name: Inflate target directories (2.13.9, rootNative)
+        run: |
+          tar xf targets.tar
+          rm targets.tar
+
+      - name: Download target directories (3.1.3, rootJS)
         uses: actions/download-artifact@v2
         with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-2.12.17
+          name: target-${{ matrix.os }}-${{ matrix.java }}-3.1.3-rootJS
 
-      - name: Inflate target directories (2.12.17)
+      - name: Inflate target directories (3.1.3, rootJS)
         run: |
           tar xf targets.tar
           rm targets.tar
 
-      - name: Download target directories (2.13.9)
+      - name: Download target directories (3.1.3, rootJVM)
         uses: actions/download-artifact@v2
         with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-2.13.9
+          name: target-${{ matrix.os }}-${{ matrix.java }}-3.1.3-rootJVM
 
-      - name: Inflate target directories (2.13.9)
+      - name: Inflate target directories (3.1.3, rootJVM)
         run: |
           tar xf targets.tar
           rm targets.tar
 
-      - name: Download target directories (3.1.3)
+      - name: Download target directories (3.1.3, rootNative)
         uses: actions/download-artifact@v2
         with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-3.1.3
+          name: target-${{ matrix.os }}-${{ matrix.java }}-3.1.3-rootNative
 
-      - name: Inflate target directories (3.1.3)
+      - name: Inflate target directories (3.1.3, rootNative)
         run: |
           tar xf targets.tar
           rm targets.tar
diff --git a/.jvmopts b/.jvmopts
new file mode 100644
index 0000000..3f0aee1
--- /dev/null
+++ b/.jvmopts
@@ -0,0 +1,3 @@
+-Xms1G
+-Xmx4G
+-XX:+UseG1GC
diff --git a/build.sbt b/build.sbt
index c822773..770049b 100644
--- a/build.sbt
+++ b/build.sbt
@@ -7,14 +7,15 @@ val Scala213 = "2.13.9"
 ThisBuild / crossScalaVersions := Seq("2.12.17", Scala213, "3.1.3")
 ThisBuild / scalaVersion := Scala213
 
-lazy val root = project.in(file(".")).aggregate(scalatags).enablePlugins(NoPublishPlugin)
+lazy val root = tlCrossRootProject.aggregate(scalatags)
 
 val http4sVersion = "0.23.16"
 val scalatagsVersion = "0.12.0"
 val munitVersion = "1.0.0-M6"
 val munitCatsEffectVersion = "2.0.0-M3"
 
-lazy val scalatags = project
+lazy val scalatags = crossProject(JVMPlatform, JSPlatform, NativePlatform)
+  .crossType(CrossType.Pure)
   .in(file("scalatags"))
   .settings(
     name := "http4s-scalatags",
@@ -28,3 +29,6 @@ lazy val scalatags = project
       "org.http4s" %%% "http4s-laws" % http4sVersion % Test,
     ),
   )
+  .nativeSettings(
+    unusedCompileDependenciesTest := {}
+  )
diff --git a/project/plugins.sbt b/project/plugins.sbt
index c70624f..bb43098 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1 +1,4 @@
 addSbtPlugin("org.http4s" % "sbt-http4s-org" % "0.14.6")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.10.1")
+addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.7")
+addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.2.0")
diff --git a/scalatags/src/test/scala/org/http4s/scalatags/ScalatagsSuite.scala b/scalatags/src/test/scala/org/http4s/scalatags/ScalatagsSuite.scala
index cedc46f..812f3f0 100644
--- a/scalatags/src/test/scala/org/http4s/scalatags/ScalatagsSuite.scala
+++ b/scalatags/src/test/scala/org/http4s/scalatags/ScalatagsSuite.scala
@@ -20,22 +20,19 @@ package scalatags
 import _root_.scalatags.Text
 import cats.data.NonEmptyList
 import cats.effect.IO
-import cats.syntax.all._
 import munit.CatsEffectSuite
 import org.http4s.Status.Ok
 import org.http4s.headers.`Content-Type`
 
 class ScalatagsSuite extends CatsEffectSuite {
-  implicit class ParseResultSyntax[A](self: ParseResult[A]) {
-    def yolo: A = self.valueOr(e => sys.error(e.toString))
-  }
-
-  private val testCharsets = NonEmptyList.of(
+  private val testCharsets = NonEmptyList(
     Charset.`ISO-8859-1`,
-    Charset.fromString("Windows-1251").yolo,
-    Charset.fromString("GB2312").yolo,
-    Charset.fromString("Shift-JIS").yolo,
-    Charset.fromString("Windows-1252").yolo,
+    List(
+      Charset.fromString("Windows-1251").toOption,
+      Charset.fromString("GB2312").toOption,
+      Charset.fromString("Shift-JIS").toOption,
+      Charset.fromString("Windows-1252").toOption,
+    ).flatten,
   )
 
   private def testBody() = {