printpreview_mask.html

Enable keyboard shortcuts

<!doctype html>

<style>

div {

  background: black;

  color: white;

  -webkit-mask-image: linear-gradient(180deg,#000 60%,transparent);

  mask-image: linear-gradient(180deg,#000 60%,transparent);

</style>

<div>

  Here's some text<br>

  Here's some text<br>

  Here's some text<br>

  Here's some text<br>

  Here's some text<br>

</div>