For example the cafrisun set has an earth property attack of 12 is it a flat damage? Or it increases on higher level i know it changes depends on the elements but does it increase on higer level or just flat 12?
Cafrisun is a special case. It gives you a buff that adds an additional auto attack like Sacrament does.
Elemental Property Attack is not affect by crit, but it does scale with attributes, skill modifiers (like Snipe), and monster weaknesses (like Heavy Shot vs Plate).
So for something like mana mana or arde dagger their property attacks increases as you level? Or just the same flat x property damage? Im not referring on the elements of the mobs cause they increases as you counter elements 
It’s all flat damage. Arde dagger’s 153 fire damage will stay as 153 always same applies for mana mana and karacha etc.
No, I meant the skill attributes that increase the damage of a skill that you train.
Elemental Property Attack doesn’t increase with your level.
Thanks for the responses 
It’ll be 12+additional damage+elemental damage.
If you focus on stacking those stats you can keep it relevant for the entirety of current content.
Scales linearly, doesn’t benefit from crit.
Good for DOT heavy and full str builds. Not as good for DEX builds, but still decent.