t.getElementById('pause');
    var $playHref = document.getElementById('playUrl');
    var $container = document.getElementById('container');
    var $destroy = document.getElementById('destroy');
    var $fps = document.querySelector('.fps-inner');
    var $useMSE = document.getElementById('useMSE');
    var $useSIMD = document.getElementById('useSIMD');
    var $useWASM = document.getElementById('useWASM');
    var $useWCS = document.getElementById('useWCS');
    var $videoBuffer = document.getElementById