[单色36F]
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUzZv+f8kW/AAAACklEQVQI12NgAAAAAgAB4iG8MwAAAABJRU5ErkJggg==

[单色63F]
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEVmM/8ySQD1AAAACklEQVQI12NgAAAAAgAB4iG8MwAAAABJRU5ErkJggg==

[单色F36]
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEX/M2ZJWKhqAAAACklEQVQI12NgAAAAAgAB4iG8MwAAAABJRU5ErkJggg==

[单色F63]
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEX/ZjOVlaQAAAAACklEQVQI12NgAAAAAgAB4iG8MwAAAABJRU5ErkJggg==

[透明色]
data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7

[黑色]
data:image/gif;base64,R0lGODlhAQABAIAAAAUEBAAAACwAAAAAAQABAAACAkQBADs=

[XXX]
data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==

[红色]
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEX/AAAZ4gk3AAAACklEQVQI12NgAAAAAgAB4iG8MwAAAABJRU5ErkJggg==