How does +% Area Damage stack with other +% damage mods?

I'm wondering whether a +11% to Area Damage mod stacks itself onto other mods like +% physical damage or +% elemental damage, or whether it will provide a net 11% increase to damage. I'm using Ice Crash, if that matters. Thanks!
It stacks additively, all increased damage stack additively.

For exemple 10% increased area damage and 90% increased physical damage will give 100% increased damage for a physical aoe attack
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