Whenever I make something really cool involving SVG filters in one browser - it'll have some minor bug or performance hitch in a second browser.
And in a third browser it'll just not work at all (most often Safari)...
Every. Damn. Time.
😩
A few years ago we built and shipped a surgery planning tool entirely based on (nested) SVG transforms.
After a lot of sweat we had to surrender, and we added browser detection to disable it on Safari. 😓