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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>Reference: Active opacity should be rendered if it's inside the display port, even if it's currently offscreen</title>
<style>
#scrollbox {
border: 1px solid black;
width: 200px;
height: 200px;
overflow: hidden;
}
#scrolledContent {
height: 1000px;
}
#opacity {
will-change: opacity;
opacity: 0.5;
margin-top: 250px;
width: 100px;
height: 100px;
box-sizing: border-box;
border: 1px solid blue;
}
</style>
<div id="scrollbox">
<div id="scrolledContent">
<div id="opacity"></div>
</div>
</div>
<script>
document.getElementById("scrollbox").scrollTop = 150;
</script>