don't emulate scroll event

lib/single-file/lazy-loader-after.js

@@ -24,6 +24,7 @@
 
 	Element.prototype.getBoundingClientRect = window._singleFile_getBoundingClientRect;
 	delete window._singleFile_getBoundingClientRect;
-	dispatchEvent(new UIEvent("scroll"));
+	requestAnimationFrame(() => scrollBy(0, 1));
+	requestAnimationFrame(() => scrollBy(0, -1));
 
 })();

lib/single-file/lazy-loader-before.js

@@ -18,19 +18,20 @@
  *   along with SingleFile.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-/* global window, screen, dispatchEvent, Element, UIEvent */
+/* global window, screen, scrollBy, requestAnimationFrame, Element */
 
 (() => {
 
 	window._singleFile_getBoundingClientRect = Element.prototype.getBoundingClientRect;
 	Element.prototype.getBoundingClientRect = function () {
 		const boundingRect = window._singleFile_getBoundingClientRect.call(this);
-		const top = (boundingRect.top > 0 && boundingRect.top < screen.height) ? boundingRect.top : screen.height / 2;
-		const left = (boundingRect.left > 0 && boundingRect.left < screen.width) ? boundingRect.left : screen.width / 2;
+		const top = (boundingRect.top > 0 && boundingRect.top < screen.height) ? boundingRect.top : 0;
+		const left = (boundingRect.left > 0 && boundingRect.left < screen.width) ? boundingRect.left : 0;
 		const bottom = top + boundingRect.height;
 		const right = left + boundingRect.width;
 		return { x: boundingRect.x, y: boundingRect.y, top, bottom, left, right, width: boundingRect.width, height: boundingRect.height };
 	};
-	dispatchEvent(new UIEvent("scroll"));
+	requestAnimationFrame(() => scrollBy(0, 1));
+	requestAnimationFrame(() => scrollBy(0, -1));
 
 })();