Subtitle state will now be remembered across page loads by cookie

player.js

@@ -66,7 +66,7 @@ function init() {
             setupSwitching(mainstream)
             setupSync(mainstream)
             setupPlayback(body, mainstream)
-            setupSubs(presentation.subtitles)
+            setupSubs(presentation.subtitles, cookies.subtitles)
         }
         awaitLoad(function() {
             setupBuffer(mainstream)
@@ -159,6 +159,12 @@ function setCookie(name, value) {
     document.cookie = cookie
 }
 
+function delCookie(name) {
+    var cookie = name + '='
+    cookie += ';samesite=strict;expires=Thu, 01 Jan 1970 00:00:01 GMT'
+    document.cookie = cookie
+}
+
 function swapText(element) {
     var oldtext = element.title
     element.title = element.dataset['title_alt']
@@ -589,7 +595,7 @@ function setupSpeed() {
             button.addEventListener('click', setSpeed)})
 }
 
-function setupSubs(subs) {
+function setupSubs(subs, subCookie) {
     var button = document.querySelector('#subtitles-button')
     var icons = document.querySelectorAll('#subtitles-button > svg > use')
 
@@ -611,13 +617,19 @@ function setupSubs(subs) {
         var track = mainstream.textTracks[0]
         if(track.mode == 'disabled') {
             track.mode = 'showing'
+            setCookie('subtitles', 'on')
         } else {
             track.mode = 'disabled'
+            delCookie('subtitles')
         }
         swapText(button)
     }
     document.querySelector('#subtitles-button')
         .addEventListener('click', toggleSubs)
+
+    if(subCookie == 'on') {
+        toggleSubs(null)
+    }
 }
 
 function setupSwitching(mainstream) {