MIL-DTL-87268D
3.4.2.2.1 Character font. All titles, headings, callouts and special characters shall be sans-serif font. Narrative
text shall be serif font. Table II lists the minimum recommended character heights for various reference
viewing distances and shall be used to determine the appropriate character font size. Unless otherwise
speciied by the acquiring activity, the minimum reference viewing distance shall be 36 inches (see 6.2q).
3.4.2.2.2 Character spacing. Character spacing in textual displays shall be no less than 0.1 character height.
Between word spacing for textual displays shall be one character width (Em space).
3.4.2.2.3 Line dimensions. Between line spacing for textual displays shall be 0.33 of character height
exclusive of superscripts and subscripts and no less than 0.15 character height when superscripts and
subscripts are displayed.
3.4.2.2.4 Text panes. The width of the text pane shall range from 30 to 60 characters per line.
3.4.2.2.5 Margins. Margins shall be required for all text panes to prevent information from being
obscured by borders or information in adjacent panes.
3.4.2.2.6 Justiication. Left justiication shall be used for all lines of text displayed as sentences or paragraphs.
3.4.2.2.7 Word wrapping. Lines of text shall wrap, so that no line extends beyond the limits of the
pane or right margin, including when resized. Lines shall be broken only between individual words or
within a word when that word is explicitly hyphenated. If resized text exceeds the text pane area,
vertical scrolling shall be used (see 3.4.1.2.4.1).
3.4.2.2.8 Hyphenation. Hyphenation shall not be used to display normally non-hyphenated words on
successive lines.
3.4.2.2.9 Selection of text. The ability to highlight selectable textual information on the screen, e.g.,
by color change, brightness variance, image reversal, font change shall exist. The capability to select a
highlighted character string, i.e., one that is indicated as selectable, by positioning the cursor on or near
that string and activating the SELECT function shall be provided.
3.4.2.3 Scrolling. When the displayed text exceeds the length of the data pane, the text shall scroll and a
visual cue shall be provided (vertical scroll bar). Manipulation of the displayed text shall be provided using
the SCROLL function. The capability to move through textual information, one line at a time, shall be
provided using the SCROLL UP and SCROLL DOWN functions.
3.4.2.4 Graphics. The IETM shall display graphics in a data pane as follows.
3.4.2.4.1 Display of graphic overlays. Encoded graphics shall be displayed along with any associated
callout overlays designed to indicate the speciic components of the graphic.
3.4.2.4.2 Types of graphics. Two types of graphics shall be displayed: static and interactive. Static graphics
shall be displayed in full detail in the graphic area provided, with no ability for manipulation. Interactive
graphics shall provide the capability for manipulation.
3.4.2.4.3 Scale. Graphics shall be displayed to a scale at least as large as its designated minimum size
so that all essential detail is legible.
3.4.2.4.4 Display. Graphics shall be displayed in an assigned data pane of the displayed window. If a
graphic cannot be displayed in its entirety and in full detail, it shall be displayed using interactive graphic
display techniques described in this speciication, e.g., scrolling, zooming.
3.4.2.4.5 Selection. The user shall be given the capability to select a point, area, or the entire graphic by
positioning the cursor on or near that point and activating the SELECT function. Selectable regions of a
graphic shall be visually distinct and shall not adversely affect the appearance of the graphic. The selection
of graphical information shall include, but is not limited to, the following:
a. Selecting an individual graphic object, such as a part, displayed in a graphic.
b. Selecting a point or rectangular area in a graphic image.
3.4.2.4.6 Manipulation. Graphics designated as scrollable shall have the capability to activate SCROLL,
ZOOM, CENTER, or FULL SCREEN functions. These options shall be available whenever the graphic
exceeds the size of the data pane.
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