default scroll behavior

mirva/resources/mirva.js

@@ -2,11 +2,13 @@ let current = -1;
 let currentScrolled = -1;
 let scrollTimer = null;
 let scrollEventTimer = null;
+let defaultScroll = "smooth";
 
 function r(f) {
   /in/.test(document.readyState) ? setTimeout('r(' + f + ')', 9) : f()
 }
 r(function() {
+  defaultScroll = typeof document.body.dataset.scroll === "string" ? document.body.dataset.scroll : "smooth";
   create_nav();
   document.onkeydown = keyboard_entry;
 });
@@ -37,7 +39,7 @@ function create_button(direction, to, next) {
   button.classList.add("navigation_button");
   button.onclick = function() {
     to.parentElement.scrollIntoView({
-      behavior: "smooth"
+      behavior: defaultScroll
     });
     current = next;
   };
@@ -132,7 +134,7 @@ function keyboard_entry(ev) {
     return
   }
   if (current == -1) {
-      window.scrollTo({ top: 0, behavior: 'smooth' });
+      window.scrollTo({ top: 0, behavior: defaultScroll });
       return
   }
   current = Math.max(0, current);
@@ -145,7 +147,7 @@ function keyboard_entry(ev) {
     clearTimeout(scrollTimer);
   } else {
     posts[current].parentElement.scrollIntoView({
-      behavior: "smooth"
+      behavior: defaultScroll
     });
   }
   scrollTimer = setTimeout(function() {