No. whoever said that "the norm is to tip 10-15% for meals" was a US-American who thought they had to tip because it was in their bones.
The norm is not to tip. If the bill says €19.90, you hand over your €20 note and wait for your €0.10 change.
You can, if you wish, tip at a restaurant if you think you have got above average service or your group have given them a lot of work. If the bill is €18.50, hand over an €20 and say keep the change. But you don't need to do this, only sometimes if you feel it is exceptionally deserved.
Taxis you don't need to tip, unless they have done extra like carry your bags.
This is also to do with "the price quoted is the price". Menus always list prices, that is what you pay, all taxes and everything included. If the price is higher on the bill, they are conning you and you can get angry. Same in a shop, the price on the shelf is what you pay. You can count out the correct money while waiting to pay, and hand it over.