Custom color for the foreground of the text character at the terminal’s highlight position, as a color specification (can be HTML-style hex digits, or a color name such as “red”). This is ignored if highlight-colors-set is false.
Number of scrollback lines to keep around. You can scroll back in the terminal by this number of lines; lines that don’t fit in the scrollback are discarded. If scrollback_unlimited is true, this value is ignored.