Traditionally csrf tokens had two parts: something in a cookie(/server side data store that used a cookie as the id), and something in a form element on the pag

Traditionally csrf tokens had two parts: something in a cookie(/server side data store that used a cookie as the id), and something in a form element on the page. So while an attacker could trick your browser to making a request to get the cookie, and trick your browser into submitting arbitrary form data, they couldn’t get the csrf tokens to match.