Is the OSSD Right for You A Look at the Requirements

Before online high school classes became popular in Ontario, students usually had to go to a physical school building to earn their diplomas. This meant attending the public school assigned to their neighbourhood (unless their family opted for a private school). In-person attendance was the norm because online learning wasn't widely available.

https://www.uscaacademy.com/ontario-secondary-school-diploma-ossd/