<!DOCTYPE html> <html> <head> <title>Test context-stroke-opacity works with context-stroke</title> <style> img { width: 100px; height: 100px; -moz-context-properties: stroke, stroke-opacity; stroke: blue; stroke-opacity: 0.5; } </style> </head> <body> <img src="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg'><line x1='0' y1='50%' x2='100%' y2='50%' stroke-width='120%' stroke='context-stroke' stroke-opacity='context-stroke-opacity'/></svg>"> </body> </html>