fix: wrong argument order

Author: rob

lib/js/tests/Webapi/Webapi__IntersectionObserver__test.js

@@ -15,7 +15,7 @@ el.innerText = "Hello There";
 
 el.setAttribute("style", "margin-top: 800px; margin-bottom: 800px");
 
-el.appendChild(body);
+body.appendChild(el);
 
 function handler(entries, observer) {
   entries.forEach(function (entry) {

tests/Webapi/Webapi__IntersectionObserver__test.res

@@ -7,7 +7,7 @@ let body =
 
 Webapi.Dom.Element.setInnerText(el, "Hello There")
 Webapi.Dom.Element.setAttribute(el, "style", "margin-top: 800px; margin-bottom: 800px")
-Webapi.Dom.Element.appendChild(el, body)
+Webapi.Dom.Element.appendChild(body, el)
 
 let handler = (entries, observer) => {
   Js.Array.forEach(entry => {