Fix initialization when dpointer loaded before document.body exists.

Remove vestigial code for "-ms-touch-action" (IE10 is no longer supported).
Fix harmless (but useless) double-creation of CSS rule, refs #30.
Fix has("touch-device") to be true on iPad with iOS 13.

Note though that iOS and Mac now finally support pointer events
natively, so this library has mostly outlived its usefulness.

README.md

@@ -5,7 +5,7 @@ This project proposes a unified and consistent javascript events API which aims
 This API is a shim of the [W3C Pointer Events specification][W3C_pointer] and adds features that are out of scope of the current specification.
 
 - Generates **Pointer Events** according to the current specification.
-- Use attribute `touch-action` to set touch action on HTML elements; generates `touch-action` and `ms-touch-action` CSS properties when supported by the browser.
+- Use attribute `touch-action` to set touch action on HTML elements; generates `touch-action` CSS properties when supported by the browser.
 - Support **Pointer Capture** with mouse and touch events.
 - Normalize **click** (Tap) events, **double click** (double Tap) events, and event **button/buttons/which** values.
 - Supports immediate clicks (no ~300ms delay) 

events.js

@@ -117,22 +117,12 @@ define([
 		document.head.insertBefore(styleElement, document.head.firstChild);
 	}
 
-	// CSS rule when user agent implements W3C Pointer Events or when a polyfill is in place.
-	if (has("pointer-events")) {
+	// CSS rule when user agent implements W3C Pointer Events or when a polyfill is in place,
+	// or user agent has native support for touch-action.
+	if (has("pointer-events") || has("css-touch-action")) {
 		insertTouchActionCSSRule("touch-action");
 	}
 
-	// CSS rule to map CSS attribute in case user agent has native support for touch-action or -ms-touch-action
-	// CSS property.
-	if (has("css-touch-action")) {
-		insertTouchActionCSSRule("touch-action");
-	} else {
-		// CSS rule for IE10 and IE11 preview
-		if (has("css-ms-touch-action")) {
-			insertTouchActionCSSRule("-ms-touch-action");
-		}
-	}
-
 	// start listening to native events
 	pointerEvents.enable();
 

handlers/features.js

@@ -1,15 +1,20 @@
 /**
- * 
+ * Feature detection tests.
  */
 define([
 	"requirejs-dplugins/has"
 ], function (has) {
 	if (typeof document !== "undefined") {
 		has.add("touch-events", "ontouchstart" in document); // UA supports Touch Events
 		has.add("pointer-events", "onpointerdown" in document); // UA supports Pointer Events
-		has.add("touch-device", /(mobile)|(android)/i.test(navigator.userAgent)); // mobile device
-		has.add("css-touch-action", "touchAction" in document.body.style);// touch-action CSS
-		has.add("css-ms-touch-action", "msTouchAction" in document.body.style);// -ms-touch-action CSS
+
+		// Mobile device
+		// Special test for iOS 13.1+, to counteract misleading userAgent string.
+		var ios13 = /Safari/.test(navigator.userAgent) && "ontouchstart" in document;
+		has.add("touch-device", /(mobile)|(android)/i.test(navigator.userAgent) || ios13); // mobile device
+
+		has.add("css-touch-action", "touchAction" in document.createElement("div").style);
 	}
+
 	return has;
 });