Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for adjusting ordinal positions for content item slots in response to determining that a content item slot with a highest slot ordinal position relative to the other content item slots in a resource is not within a viewport area. A device for processing e-mail containing a plurality of destination addresses, contents corresponding respectively to the destination addresses, and display attributes for displaying the corresponding contents on a display device is provided. The wiper-moving mechanism moves the wiper in the circumferential direction along the outer circumferential surface so that the wiper wipes ejection surface of at least one of the inkjet heads while the inkjet heads are in the wiping position. The pattern of analysis strips, fixed strips and blank regions may be provided to encode one or more charactersdigits of information. The contoured transition of the fitting is alternatively molded with either an exterior bulge or an interior bulge.