One important distinction in the syntax between drop-shadow and box-shadow is how to do multiple shadows. In drop-shadow you need to repeat the drop-shadow function for each shadow you add to the element. Box-shadow allows you to just add a comma.
.zombie4a {
filter: drop-shadow(15px 15px 5px greenyellow) drop-shadow(-15px -15px 5px greenyellow);
}
.zombie4b {
box-shadow: 15px 15px 5px greenyellow, -15px -15px 5px greenyellow;
}Code language: CSS (css)