The new official “tag hidden” complex spoiler image is now 100% vector, for increased clarity on HiDPI devices (including mobile phones and 4K displays).
 
Old (for comparison) >>104317 
Celestia image used >>523
 
For those unsure of the differences, here is a side-by-side comparison. 
-> The new image is viewBoxed at 500px, however it can be rendered at any resolution. 
-> The font has changed based on popular availability. 
-> To keep the vector simple, the background stripes have little color variance.