Implemented non-color attributes:
1: This is bold.
3: This is italic.
4: This is underlined.
5: This is slowly blinking.
6: This is rapidly blinking.
7: This is inverse.
8: This is hidden.
9: This is struck out.
21: This is double underlined.
53: This is overlined.
Unimplemented non-color attributes:
2: weight:feint
20: style:fraktur
51: frame:box
52: frame:circle