Like change/read palette color but allows setting attribute replacement colors without need to know the palette size.
Readback mode may still use special indices as would be needed with change/read palette color
Attributes replacement colors are used instead of some attributes under certain conditions. Conditons are terminal specific.
|number osc 5||number osc 4||replaces|
🛈 each attribute has a separate setting that needs to be enabled for the replacement colors to be used. These settings default to off 🛈 Since xterm 345 readback results in a osc 5 reply sequence, in older versions readback results in an osc 4 reply sequence.
🛈 only bold is supported. The replacement color is always used. 🛈 readback results in an osc 5 reply sequence.