How can I fade-into a passage, using Snowman?

Hello,

I would like to implement the same fade-in transitions for passages that are used in Harlowe and Sugarcube.

I have tried to do this using CSS:

#passage {
	transition: 1s linear;
	-webkit-transition: 1s linear;
}

or JQuery, inside the passages:

<script>
$("#passage").fadeIn(1000);
</script>

but I can't seem to get it working. What am I missing?