That printf command is, strictly, wrong. It was pointed out some years ago, when people started adopting this, that ITU T.416 has a colour space parameter before the RGB values.
A few terminal emulators nowadays get this right and accept the full 9-parameter form, with colons.
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[ 4.4 ms ] story [ 13.9 ms ] threadA few terminal emulators nowadays get this right and accept the full 9-parameter form, with colons.