Publisher traps TrueType text on all Windows platforms. Text trapping If text is in a transparent frame and overlaps a colored object, Publisher traps only those characters that overlap the object to the background object's color. If the text is in a frame that is filled with a color, Publisher traps the text characters to the text frame's color. If text is set to not wrap around objects other than lines, Publisher always traps by spreading colors into overlapping objects. Publisher does not trap text to objects on top of the text.
Publisher also can trap text differently over different backgrounds.
Publisher also traps drop caps. Publisher does not trap text with outline, underline, shadow, engrave, or emboss formats applied. With some script fonts, trapping may create gaps where strokes of characters overlap. In this case, you can choose to always use spreads to trap text by using the Preferences dialog box. You can highlight a single character or group of characters that have the same color and format, and then set traps that apply only to the selected characters.