chromium/src/third_party/blink/web_tests/compositing/overflow/overflow-scroll-background-opaque-to-transparent-expected.html - manifest_repos/chromium_src - Git at Google

 <!DOCTYPE html>
 <style>
 #scroller {
     background: transparent local content-box;
     border: 10px solid rgba(0, 255, 0, 0.5);
     contain: paint;
     overflow: scroll;
     width: 200px;
     height: 200px;
 }
 .spacer {
     height: 300px;
 }
 </style>
 <div id="scroller"><div class="spacer"></div></div>
 <p>Scroller background should be white</p>
	<!DOCTYPE html>
	<style>
	#scroller {
	background: transparent local content-box;
	border: 10px solid rgba(0, 255, 0, 0.5);
	contain: paint;
	overflow: scroll;
	width: 200px;
	height: 200px;
	}
	.spacer {
	height: 300px;
	}
	</style>
	<div id="scroller"><div class="spacer"></div></div>
	<p>Scroller background should be white</p>