UserScript: Supports YouTube Shorts

Extensions/UserScript/Return Youtube Dislike.user.js

@@ -30,13 +30,34 @@ let likesvalue = 0;
 let dislikesvalue = 0;
 
 let isMobile = location.hostname == "m.youtube.com";
+let isShorts = () => location.pathname.startsWith("/shorts")
 let mobileDislikes = 0;
 function cLog(text, subtext = "") {
   subtext = subtext.trim() === "" ? "" : `(${subtext})`;
   console.log(`[Return YouTube Dislikes] ${text} ${subtext}`);
 }
 
+function isInViewport(element) {
+  const rect = element.getBoundingClientRect();
+  const height = innerHeight || document.documentElement.clientHeight;
+  const width = innerWidth || document.documentElement.clientWidth;
+  return (
+      rect.top >= 0 &&
+      rect.left >= 0 &&
+      rect.bottom <= height &&
+      rect.right <= width
+  );
+}
+
 function getButtons() {
+  if(isShorts()) {
+    let elements=document.querySelectorAll("#like-button > ytd-like-button-renderer");
+    for(let element of elements) {
+      if(isInViewport(element)) {
+        return element;
+      }
+    }
+  }
   if (isMobile) {
     return document.querySelector(".slim-video-action-bar-actions");
   }
@@ -214,6 +235,7 @@ function createRateBar(likes, dislikes) {
   }
 }
 
+
 function setState() {
   cLog("Fetching votes...");
   let statsSet = false;
@@ -232,7 +254,6 @@ function setState() {
       }
     });
   });
-  setState = function(){};
 }
 
 function likeClicked() {
@@ -288,6 +309,9 @@ function getVideoId() {
   if (pathname.startsWith("/clip")) {
     return document.querySelector("meta[itemprop='videoId']").content;
   } else {
+    if (pathname.startsWith("/shorts")) {
+      return pathname.substr(8);
+    }
     return urlObject.searchParams.get("v");
   }
 }
@@ -335,7 +359,7 @@ function setEventListeners(evt) {
 
   function checkForJS_Finish(check) {
     console.log();
-    if (getButtons()?.offsetParent && isVideoLoaded()) {
+    if (isShorts() || getButtons()?.offsetParent && isVideoLoaded()) {
       clearInterval(jsInitChecktimer);
       const buttons = getButtons();