I use yad fonts as pango style, like the man page required:
yad --width=250 --text 'foo bar base' --fontname="Serif bold italic 90"
there's no difference if I do
yad --width=250 --text 'foo bar base' --fontname="Serif bold italic 10"
bug or PEBKAC?
Modified example from doc page: http://smokey01.com/yad/
Better real test case, using <span font="24"> trick (display the tag as is without HTML rendering):
yad --no-focus --on-top --borders=10 --geometry -0+80 --height=100 --no-markup --question --title 'title' --text '<span font="24">coucou\nhey\n20230228</span>'