third_party/blink/web_tests/paint/subpixel/subpixel-accumulation-with-fixedpos.html - chromium/src - Git at Google

 <!DOCTYPE html>
 PASS if there is no red visible.
 <div style="background: white; width: 100px; height: 100px; position: relative; left: 0.7px;">
     <div style="background: white; width: 70px; height: 70px; position: relative; transform: translateZ(0);">
         <div style="background: red; width: 40px; height: 40px; position: fixed;">
             <!-- Because the first div is snapped up to (1,1), this div will start with a -->
             <!-- paint offset of (-0.3,-0.3) which will be added to (0.7,0.7) to get -->
             <!-- (0.4,0.4) which rounds down to (0,0) and obscures the red divs. -->
             <div style="width: 40px; height: 40px; background: white; position: relative; left: 0.7px;"></div>
         </div>
     </div>
 </div>
	<!DOCTYPE html>
	PASS if there is no red visible.
	<div style="background: white; width: 100px; height: 100px; position: relative; left: 0.7px;">
	<div style="background: white; width: 70px; height: 70px; position: relative; transform: translateZ(0);">
	<div style="background: red; width: 40px; height: 40px; position: fixed;">
	<!-- Because the first div is snapped up to (1,1), this div will start with a -->
	<!-- paint offset of (-0.3,-0.3) which will be added to (0.7,0.7) to get -->
	<!-- (0.4,0.4) which rounds down to (0,0) and obscures the red divs. -->
	<div style="width: 40px; height: 40px; background: white; position: relative; left: 0.7px;"></div>
	</div>
	</div>
	</div>