What´s Browser casparcg use for HTML?

i have an issue with some class like display: flex , for img tags , in web everything works , but in casparcg some of this classes doesnt work , why ??? whats the browser casparcg use '?

thanks

from another post:
CasparCG 2.0.7 - Chrome 33.0.1750
CasparCG 2.1.0 - Chrome 33.0.1750
CasparCG 2.2.0 - Chrome 63.0.3239
CasparCG 2.3.0 - Chrome 71.0.3578
CasparCG 2.3.1 - Chrome 71.0.3578

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thanks Andrea ,

Merry christmas