[Tyriar]

It's actually been the default since v1.55 which released early April 2021: https://code.visualstudio.com/updates/v1_55#_webgl-renderer-...

Before that from v1.17 (~October 2017) it was using a 2d canvas context: https://code.visualstudio.com/blogs/2017/10/03/terminal-rend...