diff --git a/src/frontend/browser_console_error.rs b/src/frontend/browser_console_error.rs
index f469824..7abfbdc 100644
--- a/src/frontend/browser_console_error.rs
+++ b/src/frontend/browser_console_error.rs
@@ -2,40 +2,152 @@
 //
 // SPDX-License-Identifier: MIT
 
+//! Browser console error types.
+//!
+//! This module defines [`BrowserConsoleError`], which represents failures
+//! when attempting to serialize errors or log them to the browser console.
+//!
+//! # Error Variants
+//!
+//! - [`BrowserConsoleError::Serialization`] - Serialization to JsValue failed
+//! - [`BrowserConsoleError::ConsoleUnavailable`] - Console object not
+//!   accessible
+//! - [`BrowserConsoleError::ConsoleErrorUnavailable`] - console.error not
+//!   accessible
+//! - [`BrowserConsoleError::ConsoleMethodNotCallable`] - console.error not
+//!   callable
+//! - [`BrowserConsoleError::ConsoleInvocation`] - console.error invocation
+//!   failed
+//! - [`BrowserConsoleError::UnsupportedTarget`] - Not a WASM target
+//!
+//! # Examples
+//!
+//! ```
+//! use masterror::frontend::BrowserConsoleError;
+//!
+//! let err = BrowserConsoleError::Serialization {
+//!     message: "invalid JSON".to_owned()
+//! };
+//! assert_eq!(err.context(), Some("invalid JSON"));
+//! ```
+
 use crate::Error;
 
 /// Error returned when emitting to the browser console fails or is unsupported.
-#[derive(Debug, Error, PartialEq, Eq)]
+///
+/// # Examples
+///
+/// ```
+/// use masterror::frontend::BrowserConsoleError;
+///
+/// let err = BrowserConsoleError::UnsupportedTarget;
+/// assert_eq!(
+///     err.to_string(),
+///     "browser console logging is not supported on this target"
+/// );
+///
+/// let err = BrowserConsoleError::ConsoleMethodNotCallable;
+/// assert!(err.to_string().contains("not callable"));
+/// ```
+#[derive(Debug, Error, Clone, PartialEq, Eq)]
 #[cfg_attr(docsrs, doc(cfg(feature = "frontend")))]
 pub enum BrowserConsoleError {
     /// Failed to serialize the payload into [`wasm_bindgen::JsValue`].
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use masterror::frontend::BrowserConsoleError;
+    ///
+    /// let err = BrowserConsoleError::Serialization {
+    ///     message: "JSON error".to_owned()
+    /// };
+    /// assert_eq!(err.context(), Some("JSON error"));
+    /// assert!(err.to_string().contains("failed to serialize"));
+    /// ```
     #[error("failed to serialize payload for browser console: {message}")]
     Serialization {
         /// Human-readable description of the serialization failure.
         message: String
     },
+
     /// The global `console` object is unavailable or could not be accessed.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use masterror::frontend::BrowserConsoleError;
+    ///
+    /// let err = BrowserConsoleError::ConsoleUnavailable {
+    ///     message: "console is null".to_owned()
+    /// };
+    /// assert_eq!(err.context(), Some("console is null"));
+    /// ```
     #[error("browser console object is not available: {message}")]
     ConsoleUnavailable {
         /// Additional context explaining the failure.
         message: String
     },
+
     /// The `console.error` function is missing or not accessible.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use masterror::frontend::BrowserConsoleError;
+    ///
+    /// let err = BrowserConsoleError::ConsoleErrorUnavailable {
+    ///     message: "error method undefined".to_owned()
+    /// };
+    /// assert_eq!(err.context(), Some("error method undefined"));
+    /// ```
     #[error("failed to access browser console `error`: {message}")]
     ConsoleErrorUnavailable {
         /// Additional context explaining the failure.
         message: String
     },
+
     /// The retrieved `console.error` value is not callable.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use masterror::frontend::BrowserConsoleError;
+    ///
+    /// let err = BrowserConsoleError::ConsoleMethodNotCallable;
+    /// assert_eq!(err.context(), None);
+    /// ```
     #[error("browser console `error` method is not callable")]
     ConsoleMethodNotCallable,
+
     /// Invoking `console.error` returned an error.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use masterror::frontend::BrowserConsoleError;
+    ///
+    /// let err = BrowserConsoleError::ConsoleInvocation {
+    ///     message: "TypeError".to_owned()
+    /// };
+    /// assert_eq!(err.context(), Some("TypeError"));
+    /// ```
     #[error("failed to invoke browser console `error`: {message}")]
     ConsoleInvocation {
         /// Textual representation of the JavaScript exception.
         message: String
     },
+
     /// Logging is not supported on the current compilation target.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use masterror::frontend::BrowserConsoleError;
+    ///
+    /// let err = BrowserConsoleError::UnsupportedTarget;
+    /// assert_eq!(err.context(), None);
+    /// ```
     #[error("browser console logging is not supported on this target")]
     UnsupportedTarget
 }
@@ -81,3 +193,73 @@ impl BrowserConsoleError {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn clone_creates_identical_copy() {
+        let err1 = BrowserConsoleError::Serialization {
+            message: "test".to_string()
+        };
+        let err2 = err1.clone();
+        assert_eq!(err1, err2);
+
+        let err3 = BrowserConsoleError::ConsoleMethodNotCallable;
+        let err4 = err3.clone();
+        assert_eq!(err3, err4);
+    }
+
+    #[test]
+    fn context_returns_none_for_unit_variants() {
+        assert_eq!(
+            BrowserConsoleError::ConsoleMethodNotCallable.context(),
+            None
+        );
+        assert_eq!(BrowserConsoleError::UnsupportedTarget.context(), None);
+    }
+
+    #[test]
+    fn context_returns_message_for_serialization() {
+        let err = BrowserConsoleError::Serialization {
+            message: "JSON parse error".to_string()
+        };
+        assert_eq!(err.context(), Some("JSON parse error"));
+    }
+
+    #[test]
+    fn context_returns_message_for_console_invocation() {
+        let err = BrowserConsoleError::ConsoleInvocation {
+            message: "TypeError: null reference".to_string()
+        };
+        assert_eq!(err.context(), Some("TypeError: null reference"));
+    }
+
+    #[test]
+    fn partial_eq_compares_variants_correctly() {
+        let serialization1 = BrowserConsoleError::Serialization {
+            message: "error1".to_string()
+        };
+        let serialization2 = BrowserConsoleError::Serialization {
+            message: "error1".to_string()
+        };
+        let serialization3 = BrowserConsoleError::Serialization {
+            message: "error2".to_string()
+        };
+
+        assert_eq!(serialization1, serialization2);
+        assert_ne!(serialization1, serialization3);
+        assert_ne!(serialization1, BrowserConsoleError::UnsupportedTarget);
+    }
+
+    #[test]
+    fn debug_format_includes_variant_and_message() {
+        let err = BrowserConsoleError::ConsoleUnavailable {
+            message: "console is undefined".to_string()
+        };
+        let debug_str = format!("{err:?}");
+        assert!(debug_str.contains("ConsoleUnavailable"));
+        assert!(debug_str.contains("console is undefined"));
+    }
+}
diff --git a/src/frontend/tests.rs b/src/frontend/tests.rs
index 97bd1ed..23f91f0 100644
--- a/src/frontend/tests.rs
+++ b/src/frontend/tests.rs
@@ -113,6 +113,74 @@ fn partial_eq_works() {
     assert_ne!(err1, err3);
 }
 
+#[test]
+fn serialization_error_with_empty_message() {
+    let err = BrowserConsoleError::Serialization {
+        message: String::new()
+    };
+    assert_eq!(err.context(), Some(""));
+    assert!(err.to_string().contains("failed to serialize"));
+}
+
+#[test]
+fn console_unavailable_with_unicode() {
+    let err = BrowserConsoleError::ConsoleUnavailable {
+        message: "コンソールなし".to_owned()
+    };
+    assert_eq!(err.context(), Some("コンソールなし"));
+}
+
+#[test]
+fn console_error_unavailable_with_long_message() {
+    let long_msg = "x".repeat(1000);
+    let err = BrowserConsoleError::ConsoleErrorUnavailable {
+        message: long_msg.clone()
+    };
+    assert_eq!(err.context(), Some(long_msg.as_str()));
+}
+
+#[test]
+fn console_invocation_with_special_chars() {
+    let err = BrowserConsoleError::ConsoleInvocation {
+        message: "Error: \"test\" <>&".to_owned()
+    };
+    assert_eq!(err.context(), Some("Error: \"test\" <>&"));
+}
+
+#[test]
+fn clone_works_for_error_variants() {
+    let err1 = BrowserConsoleError::Serialization {
+        message: "test".to_owned()
+    };
+    let err2 = err1.clone();
+    assert_eq!(err1, err2);
+}
+
+#[test]
+fn eq_compares_messages() {
+    let err1 = BrowserConsoleError::Serialization {
+        message: "msg1".to_owned()
+    };
+    let err2 = BrowserConsoleError::Serialization {
+        message: "msg1".to_owned()
+    };
+    let err3 = BrowserConsoleError::Serialization {
+        message: "msg2".to_owned()
+    };
+
+    assert_eq!(err1, err2);
+    assert_ne!(err1, err3);
+}
+
+#[test]
+fn context_returns_none_for_unit_variants() {
+    assert_eq!(
+        BrowserConsoleError::ConsoleMethodNotCallable.context(),
+        None
+    );
+    assert_eq!(BrowserConsoleError::UnsupportedTarget.context(), None);
+}
+
 #[cfg(not(target_arch = "wasm32"))]
 mod native {
     use super::*;