fix: revert changes to isFocusable. To be tackled by issue #1208

lib/commons/dom/is-focusable.js

@@ -4,13 +4,12 @@
 /**
  * Determines if focusing has been disabled on an element.
  * @param {HTMLElement} el The HTMLElement
- * @param {Boolean} screenReader Default(true), When provided, will evaluate visibility from the perspective of a screen reader
  * @return {Boolean} Whether focusing has been disabled on an element.
  */
-function focusDisabled(el, screenReader = true) {
+function focusDisabled(el) {
 	return (
 		el.disabled ||
-		(!dom.isVisible(el, screenReader) && el.nodeName.toUpperCase() !== 'AREA')
+		(!dom.isVisible(el, true) && el.nodeName.toUpperCase() !== 'AREA')
 	);
 }
 
@@ -20,12 +19,12 @@ function focusDisabled(el, screenReader = true) {
  * @memberof axe.commons.dom
  * @instance
  * @param {HTMLElement} el The HTMLElement
- * @param {Boolean} screenReader Default(true), When provided, will evaluate visibility from the perspective of a screen reader
  * @return {Boolean} The element's focusability status
  */
 
-dom.isFocusable = function(el, screenReader = true) {
-	if (focusDisabled(el, screenReader)) {
+dom.isFocusable = function(el) {
+	'use strict';
+	if (focusDisabled(el)) {
 		return false;
 	} else if (dom.isNativelyFocusable(el)) {
 		return true;