diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 8527f0d..fd7e216 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,3 +14,7 @@ jobs:
     - uses: actions/checkout@master
     - name: Run tests
       run: cargo test --verbose
+    - name: Add Wasm target
+      run: rustup target add wasm32-unknown-unknown
+    - name: Run tests on Wasm
+      run: cargo build --verbose --target wasm32-unknown-unknown
diff --git a/Cargo.toml b/Cargo.toml
index 9b69535..e8f11bb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,6 +13,7 @@ categories = ["gui"]
 
 [dependencies]
 raw-window-handle = "0.3"
+thiserror = "1.0"
 
 [target.'cfg(windows)'.dependencies]
 clipboard-win = { version = "4.0", features = ["std"] }
diff --git a/src/lib.rs b/src/lib.rs
index c396478..6a940a2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -26,6 +26,24 @@ mod platform;
 #[path = "platform/android.rs"]
 mod platform;
 
+#[cfg(not(any(
+    all(
+        unix,
+        not(any(
+            target_os = "macos",
+            target_os = "ios",
+            target_os = "android",
+            target_os = "emscripten"
+        ))
+    ),
+    target_os = "windows",
+    target_os = "macos",
+    target_os = "ios",
+    target_os = "android"
+)))]
+#[path = "platform/dummy.rs"]
+mod platform;
+
 use raw_window_handle::HasRawWindowHandle;
 use std::error::Error;
 
diff --git a/src/platform/dummy.rs b/src/platform/dummy.rs
new file mode 100644
index 0000000..410adc3
--- /dev/null
+++ b/src/platform/dummy.rs
@@ -0,0 +1,30 @@
+use crate::ClipboardProvider;
+
+use raw_window_handle::HasRawWindowHandle;
+
+struct Dummy;
+
+pub fn connect<W: HasRawWindowHandle>(
+    _window: &W,
+) -> Result<Box<dyn ClipboardProvider>, Box<dyn std::error::Error>> {
+    Ok(Box::new(Dummy))
+}
+
+impl ClipboardProvider for Dummy {
+    fn read(&self) -> Result<String, Box<dyn std::error::Error>> {
+        Err(Box::new(Error::Unimplemented))
+    }
+
+    fn write(
+        &mut self,
+        _contents: String,
+    ) -> Result<(), Box<dyn std::error::Error>> {
+        Err(Box::new(Error::Unimplemented))
+    }
+}
+
+#[derive(Debug, Clone, Copy, thiserror::Error)]
+enum Error {
+    #[error("unimplemented")]
+    Unimplemented,
+}
diff --git a/x11/src/lib.rs b/x11/src/lib.rs
index 0e2b54e..346bf51 100644
--- a/x11/src/lib.rs
+++ b/x11/src/lib.rs
@@ -360,23 +360,28 @@ impl Worker {
                     if event.target == self.context.atoms.targets {
                         let data = [self.context.atoms.targets, target];
 
-                        self.context.connection.change_property32(
-                            xproto::PropMode::REPLACE,
-                            event.requestor,
-                            event.property,
-                            xproto::AtomEnum::ATOM,
-                            &data,
-                        )
-                        .expect("Change property");
+                        self.context
+                            .connection
+                            .change_property32(
+                                xproto::PropMode::REPLACE,
+                                event.requestor,
+                                event.property,
+                                xproto::AtomEnum::ATOM,
+                                &data,
+                            )
+                            .expect("Change property");
                     } else {
-                        let _ = self.context.connection.change_property8(
-                            xproto::PropMode::REPLACE,
-                            event.requestor,
-                            event.property,
-                            target,
-                            value,
-                        )
-                        .expect("Change property");
+                        let _ = self
+                            .context
+                            .connection
+                            .change_property8(
+                                xproto::PropMode::REPLACE,
+                                event.requestor,
+                                event.property,
+                                target,
+                                value,
+                            )
+                            .expect("Change property");
                     }
 
                     let _ = xproto::send_event(