CSS transition fade in

Question

So I have used CSS transitions before but I have a unique case with this one. I am writing a custom plugin for creating modals. Essentially I create a div on the fly

Answer 1

I believe you could addClass to the element. But either way you'd have to use Jquery or reg JS

div {
  opacity:0;
  transition:opacity 1s linear;*
}
div.SomeClass {
  opacity:1;
}