Add landing page for kjol, documentation

go/vdom/events.go

@@ -17,9 +17,18 @@ const (
 	EVENT_MOUSEENTER  = "mouseenter"
 	EVENT_MOUSELEAVE  = "mouseleave"
 	EVENT_CONTEXTMENU = "contextmenu"
-	EVENT_SCROLL      = "scroll"
-	EVENT_RESIZE      = "resize"
-	EVENT_WHEEL       = "wheel"
+
+	// Pointer events unify mouse, touch and pen behind one set of handlers that all
+	// carry clientX/clientY. A component that wants to be drawn on — the signature pad —
+	// needs exactly one code path, not a mouse one and a touch one that drift apart.
+	EVENT_POINTERDOWN   = "pointerdown"
+	EVENT_POINTERMOVE   = "pointermove"
+	EVENT_POINTERUP     = "pointerup"
+	EVENT_POINTERCANCEL = "pointercancel"
+
+	EVENT_SCROLL = "scroll"
+	EVENT_RESIZE = "resize"
+	EVENT_WHEEL  = "wheel"
 
 	// focusin/focusout BUBBLE; focus/blur do not. Anything that needs to know a
 	// subtree gained focus (a tooltip staying open while a child is focused) must