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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>