javascript:(function() {  
 /* Config variables. */
 var hideShorts = 1; /* 1 = hides short slide history */
 var hideDates  = 1; /* 1 = hide watch date headers   */
 
 /* DOM variables.     */
 var searchInputPar = /* seach input tag parent */
  document.getElementById("input-1");
  
 var dateHeader     = /* class for date headers */
  document.getElementsByClassName(
   "style-scope ytd-item-section-header-renderer"
  );
  
 var searchInputTag = /* search bar tag name    */
  searchInputPar.getElementsByTagName("input");
  
 var searchInput =    /* HOT-GLUE - select first input tag in searchInputPar */
  searchInputTag[0];
  
 var ytdVideoRenderer =    /* tag for video watch history */
  document.getElementsByTagName("ytd-video-renderer");   
 
 var shortSlide =      /* tag holding short slide history */
  document.getElementsByTagName("ytd-reel-shelf-renderer"); 
 
 var dateHeaderLen       = /* ready for loop */
  dateHeader.length;
  
 var ytdVideoRendererLen = /* ready for loop */
  ytdVideoRenderer.length;
  
 var shortSlideLen = /* ready for loop */
  shortSlide.length;
  
 /* Search value variable. */ 
 var currentSearchVal;     /* forward declaration */
  
 /******************************** SUPPORT FUNCTIONS ********************************/
 /* Redefine global DOM variables to account for all history. */
 const updateDOMYouTubeDynamicHistorySearch = () => {
  dateHeader     = /* class for date headers */
   document.getElementsByClassName(
    "style-scope ytd-item-section-header-renderer"
   );
 
  ytdVideoRenderer =    /* tag for video watch history    */
   document.getElementsByTagName("ytd-video-renderer");
   
  shortSlide =         /* tag holding short slide history */
   document.getElementsByTagName("ytd-reel-shelf-renderer"); 
   
  dateHeaderLen       = /* ready for loop */
   dateHeader.length;
   
  ytdVideoRendererLen = /* ready for loop */
   ytdVideoRenderer.length;  
   
  shortSlideLen       = /* ready for loop */
   shortSlide.length;
 }; 
 
 /* Check and hide short slide history according to config. */
 const hideShortsYouTubeDynamicHistorySearch = (showShort) => {
  if (showShort == undefined) showShort = 0; /* switch parameter => 1 shows */ 
    
  /* loop and hide short slide elements */
  for (i = 0; i < shortSlideLen; i++) {
   /* if configurred to hide short slide history */
   if (showShort == 0) {
    shortSlide[i].style.display = "none"; /* hide while searching */
   } else { 
    if (showShort == 1) {
    shortSlide[i].style.display = ""; /* show while not searching */ 
    } else { /* do nothing */
     let skip;
    }
   }
  }
 };
 
 /* Show date hearders according to config variable. */
 const hideDatesYouTubeDynamicHistorySearch = (showDate) => {
  if (showDate == undefined) showDate = 0; /* switch parameter => 1 shows */ 
  
  /* loop and hide date elements */
  for (i = 0; i < dateHeaderLen; i++) {   
   /* if hideDates is configurred to hide date header */  
   if (showDate == 0) {
    dateHeader[i].style.display = "none"; /* hide dates  */
   } else {
    dateHeader[i].style.display = "";     /* show dates */
   }
  }
 };
 
 /* Perform display change according to config variables, and search.  */
 const showHideYouTubeDynamicHistorySearch = () => {
  /* if search is empty show short slide history */
  if (currentSearchVal == "") {
   /* show histroy slide element */
   if (hideShorts == 1) hideShortsYouTubeDynamicHistorySearch(1);
   
   /* show date heading element */
   if (hideDates == 1) hideDatesYouTubeDynamicHistorySearch(1);
  } else {
   /* hide shorts according to config variable   */
   if (hideShorts == 1) hideShortsYouTubeDynamicHistorySearch();
   
   /* hide dates according to config variable    */
   if (hideDates == 1) hideDatesYouTubeDynamicHistorySearch();
  }
 };
 
 /* Show and hide watch history dynamically inputting to search field. */
 const dynamicYouTubeDynamicHistorySearch = () => {
  for (i = 0; i < ytdVideoRendererLen; i++) {
   /* get all text in each video slot of history */
   let curCheck = ytdVideoRenderer[i].innerText;
   
   /* allow for more reliable search               */
   curCheck = curCheck.toLowerCase(); /* history   */   
   currentSearchVal = currentSearchVal.toLowerCase();     /* search    */
   
   /* if text in history info matches search, show */
   if (
    curCheck.indexOf(currentSearchVal) > -1 || /* any text   */
    currentSearchVal == ""                /* or empty search */
   ) { /* show videos from history         */
    ytdVideoRenderer[i].style.display = "";    
   } else { /* hide videos if not matching search  */
    ytdVideoRenderer[i].style.display = "none";   
   }
  }  
 };
 
 /*********************************************************************************** 
                                    MAIN FUNCTION
 ***********************************************************************************/
 /* Run support functions to dynamically search watch history. */
 function searchYouTubeDynamicHistorySearch() {
  currentSearchVal = searchInput.value; /* current search text */
  
  /* get updated videos parsed to page for each input    */
  updateDOMYouTubeDynamicHistorySearch();
  
  /* show and hide shorts and date elements accordingly  */
  showHideYouTubeDynamicHistorySearch();
  
  /* use updated elements to perform dynamic search      */
  dynamicYouTubeDynamicHistorySearch();
 }
 
 /* Add main function to search box, and now dynamically search watch history. */
 searchInput.addEventListener(
  "input", 
  searchYouTubeDynamicHistorySearch
 );   
})();