Code Golf: 1x1 black pixel

Question

Data URI, 83 characters

data:image/gif;base64,R0lGODlhAQABAIAAAAAAAAAAACH5BAAAAAAALAAAAAABAAEAAAICTAEAOw==

Image file: 10 bytes, in PGM format:

P5 1 1 1\n\0

To create it, in Python: 40 characters

 open('b.pgm', 'w').write('P5 1 1 1\n\0')

Unicode art format:

·

WBMP, 5 bytes:

00 00 01 01 00

Can't imagine anything smaller