rowej83

@media (max-width:767px){
    /* Phones */
}
@media (min-width:768px) and (max-width:991px){
    /* small tablets */
}
@media (min-width:992px) and (max-width:1199px){
    /* large tablets and desktop */
}
@media (min-width:1200px){

alex-shamshurin

'use strict';
class Abstract {
  // A static abstract method.
  static foo() {
    if (this === Abstract) {
      // Error Type 2. Abstract methods can not be called directly.
      throw new TypeError("Can not call static abstract method foo.");
    } else if (this.foo === Abstract.foo) {
      // Error Type 3. The child has not implemented this method.
      throw new TypeError("Please implement static abstract method foo.");