Go back only if focused input is empty

back.js

@@ -1,6 +1,6 @@
 window.addEventListener('load', function (e) {
 	this.document.body.addEventListener('keydown', function (e) {
-		if (e.key == 'Backspace') {
+		if (e.key == 'Backspace' && (e.target.tagName.toUpperCase() !== 'INPUT' || e.target.value.length === 0)) {
 			e.preventDefault()
 			window.history.back()
 		}