Просмотр поста

с ресайзом

function getScreenWidth() {
  return window.innerWidth
    ? window.innerWidth
    : (document.documentElement.clientWidth
      ? document.documentElement.clientWidth 
      : document.body.offsetWidth);
}
function prepareElement(id, width) {
  var __element = document.getElementById(id);
  if(width >= 900) {
    __element.style = 'display: block';
  }
  else {
    __element.style = 'display: none';
  }
}

window.onload = function() {
  prepareElement('container', getScreenWidth());
  window.onresize = function() {
    prepareElement('container', getScreenWidth());
  }
}