diff --git a/src/commandline.ts b/src/commandline.ts
new file mode 100644
index 00000000..86855e94
--- /dev/null
+++ b/src/commandline.ts
@@ -0,0 +1,35 @@
+/** Inject an input element into unsuspecting webpages and provide an API for interaction with tridactyl */
+
+/* TODO: 
+    CSS
+    Friendliest-to-webpage way of injecting commandline bar?
+    Security: how to prevent other people's JS from seeing or accessing the bar or its output?
+*/
+
+namespace CommandLine {
+
+    let clDiv = window.document.createElement("div")
+    let clInput = window.document.createElement("input")
+    clInput.id = "tridactyl-commandline"
+
+    /* Process the commandline on enter. */
+    clInput.addEventListener("keydown", function (keyevent) {
+        if (keyevent.key === "Enter") {
+            process()
+        }
+    })
+
+    clDiv.appendChild(clInput)
+    window.document.body.appendChild(clDiv)
+
+    /** Focus the CommandLine input */
+    export let focus = clInput.focus
+
+    /** Send the commandline to the background script and await response. */
+    function process() {
+        // TODO.
+        console.log(clInput.value)
+        clInput.value = ""
+    }
+
+}