diff --git a/implementations/Crafter.Graphics-Window.cpp b/implementations/Crafter.Graphics-Window.cpp
index 02abbc4..cec9951 100644
--- a/implementations/Crafter.Graphics-Window.cpp
+++ b/implementations/Crafter.Graphics-Window.cpp
@@ -1519,14 +1519,26 @@ extern "C" {
             g_domWindow->heldKeys.insert(code);
             g_domWindow->onRawKeyDown.Invoke(code);
         }
-        // KeyboardEvent.key is the printable form. Forward as UTF-8
-        // text input for non-control keys so onTextInput drives input
-        // fields the same way it does on Win32 / Wayland.
-        if (keyLen == 1 && static_cast<unsigned char>(keyPtr[0]) >= 0x20
-            && static_cast<unsigned char>(keyPtr[0]) != 0x7F) {
+        // KeyboardEvent.key is the printable form for character keys, BUT
+        // it's also the named identifier for non-character keys —
+        // "Backspace", "Shift", "ArrowLeft", "Enter", … Those are
+        // multi-byte ASCII strings, and a naive `keyLen > 1` check
+        // forwards them straight into input fields as literal text.
+        //
+        // The reliable discriminator: multi-byte UTF-8 has the high bit
+        // set on its first byte (lead byte ≥ 0xC0; continuation bytes
+        // ≥ 0x80). Named keys are pure ASCII letters → first byte < 0x80.
+        // So forward when:
+        //   • keyLen == 1 and the byte is a printable ASCII char, OR
+        //   • keyLen  > 1 and the first byte is ≥ 0x80 (true UTF-8).
+        // The onRawKeyDown event above already carries the key code for
+        // control-key consumers (InputField_OnKey handles Backspace/etc
+        // through that channel).
+        const auto first = static_cast<unsigned char>(keyPtr[0]);
+        if (keyLen == 1 && first >= 0x20 && first != 0x7F) {
             g_domWindow->onTextInput.Invoke(std::string_view(keyPtr, static_cast<std::size_t>(keyLen)));
-        } else if (keyLen > 1) {
-            // Multi-byte UTF-8 (non-ASCII printable). Forward as-is —
+        } else if (keyLen > 1 && first >= 0x80) {
+            // Real multi-byte UTF-8 (non-ASCII printable). Forward as-is —
             // dom-env.js always sends valid UTF-8.
             g_domWindow->onTextInput.Invoke(std::string_view(keyPtr, static_cast<std::size_t>(keyLen)));
         }