---

function checkVideo() {
	const spinContainers = document.querySelectorAll('.ant-spin-container video');
	spinContainers.forEach(function(spinContainer) {
		if( spinContainer.preload == 'none' ) {
			spinContainer.setAttribute('controls', '')
			spinContainer.preload = 'metadata';
		}
	});
}

function throttle (callbackFn, limit) {
    let wait = false;                  
    return function () {              
        if (!wait) {                  
            callbackFn.call();           
            wait = true;               
            setTimeout(function () {   
                wait = false;          
            }, limit);
        }
    }
}

window.addEventListener('scroll', throttle(checkVideo, 1000) );