Very basic test script for libass/VSFilter opaque border width compatibility

test.ass

[Script Info]
Title: Default Aegisub file
ScriptType: v4.00+
WrapStyle: 0
PlayResX: 640
PlayResY: 480
ScaledBorderAndShadow: yes
YCbCr Matrix: None

[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: Default,Arial,96,&H5FFFFFFF,&HFF0000FF,&H5F000000,&H7F0000FF,0,0,0,0,100,100,0,0,3,4,0,2,10,10,20,1

[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.00,0:00:05.00,Default,,0000,0000,0000,,{\fscx200\fscy200}{A quick brown fox jumps over the }lazy dog.