function openFullscreen() { elem = document.body; if (elem.requestFullscreen) { elem.requestFullscreen(); } else if (elem.webkitRequestFullscreen) { /* Safari */ elem.webkitRequestFullscreen(); } else if (elem.msRequestFullscreen) { /* IE11 */ elem.msRequestFullscreen(); } } Array.from(document.querySelectorAll('.option>button')).forEach((ele)=>{ ele.addEventListener('click',()=>{ // openFullscreen(); window.open(ele.dataset.href,'_blank',`height=${screen.height},width=${screen.width}`); }) })