fix: allow document.querySelector to instantiate ScrollManager

change `HTMLElement` to `Element`
`HTMLElement` extends `Element`

Author: davidpa9708

src/element.ts

@@ -36,10 +36,10 @@ const windowScrollSize = () =>
   )
 
 class ScrollElement {
-  static isWindow(element: HTMLElement | Window): element is Window {
+  static isWindow(element: Element | Window): element is Window {
     return element === window
   }
-  constructor(private element: HTMLElement | Window = window, private onScroll?: () => void) {
+  constructor(private element: Element | Window = window, private onScroll?: () => void) {
     this.element.addEventListener("scroll", this.scroll)
     if (ScrollElement.isWindow(element)) {
       this._size = windowSize

src/scroll.ts

@@ -32,7 +32,7 @@ class Scroll {
   private element: ScrollElement
   private settings: ISettings
   private animationManager: AnimationManager
-  constructor(element?: HTMLElement | Window, settings: PartialSettings = {}) {
+  constructor(element?: Element | Window, settings: PartialSettings = {}) {
     this.settings = defaultSettings
     this.updateSettings(settings)