It seems that the text that is animated with clipPath, is not being animated correct.
The text just appears (and pops) instead of showing bit by bit what a mask would do.
Is this a browser issue?
See the Pen VwqLOgL by indy-meermans (@indy-meermans) on CodePen
Damn thanks @mvaneijgen, this would be something I would've search days for while the solution was to just add % to the value 😛, classic JS but logic when you know the issue haha