Is something like (https://developer.mozilla.org/en-US/docs/Introduction_to_Layout_in_Mozilla https://developer.mozilla.org/en-US/docs/Introduction_to_Lay...) w

Is something like (https://developer.mozilla.org/en-US/docs/Introduction_to_Layout_in_Mozilla https://developer.mozilla.org/en-US/docs/Introduction_to_Lay...) what you were looking for? Or Were you looking more for how the browser reads CSS and sticks that into a formatting context? For the latter, I would suggest visiting https://developer.mozilla.org/en-US/docs/Web/CSS https://developer.mozilla.org/en-US/docs/Web/CSS and poking around the key concepts a bit