When you know just enough html but not enough web based javascript to write it up nice in the template node.
function node to the rescue!
const video_URL = msg.video_URL;
const video_times = msg.video_times;
const video_uid = msg.video_uid;
var template = msg.template;
video_URL.forEach(function(url, index){
template += '<div><center><b>' + video_times[index] + '</b></center><video id="' + video_uid[index] + '" width="300" controls preload="none" poster="' + url + '.thumb"><source src="' + url + '"type="video/mp4">Your browser does not support HTML5 video.</video><center><button class="button button1" onclick="setPlaySpeed(0.25,' + video_uid[index] + ')" type="button"><b>1/4</b></button><button class="button button1" onclick="setPlaySpeed(0.5,' + video_uid[index] + ')" type="button"><b>1/2</b></button><button class="button button2" onclick="setPlaySpeed(1,' + video_uid[index] + ')" type="button"><b>Normal</b></button><button class="button button1" onclick="setPlaySpeed(2,' + video_uid[index] + ')" type="button"><b>2x</b></button><button class="button button1" onclick="setPlaySpeed(4,' + video_uid[index] + ')" type="button"><b>4x</b></button><button class="button button1" onclick="setPlaySpeed(8,' + video_uid[index] + ')" type="button"><b>8x</b></button><button class="button button1" onclick="setPlaySpeed(16,' + video_uid[index] + ')" type="button"><b>16x</b></button><button class="button button1" onclick="setPlaySpeed(32,' + video_uid[index] + ')" type="button"><b>32x</b></button></center></div><p></p><p></p><p></p>';
});
template += '<script>'
video_uid.forEach(function(uid){
template += 'var ' + uid + ' = document.getElementById("' + uid + '");';
});
template += 'function setPlaySpeed(speed,id) { id.playbackRate = speed; } </script> </body> </html>';
msg.template = template;
return msg;