Accent

Put a glyph or a width-fitting decoration over an operand. Strings parse as TeX; elements, including ordinary Gum figures, keep their natural size.

Property	Default	Meaning
children	Empty	Accented operand.
accent	"hat"	Command name, with or without a leading backslash.
stretchy	Inferred from the name	Fit a drawn decoration to the body.
under	false	Place a stretchy decoration beneath the body.
shifty	true	Apply a single character's font skew.
mode	"math"	Symbol table for a fixed glyph; "text" supports text accents.
head-curve	0.7	Barb curvature from 0 to 1 for drawn arrow accents, including vec.

Fixed accents include hat, bar, vec, dot, ddot, acute, grave, breve, check, tilde, and mathring. Wide hats, checks, and tildes fit the measured width, including a figure's width. Arrows, groups, and line segments use the MathStretch names.

The body is cramped for an over-accent. A SupSub around an accented single character attaches its scripts to the original character; an accented compound operand supplies its complete decorated box. Fixed accent overhang does not enlarge advance. Stretchy accents can enlarge a narrow operand to their minimum width. The result is an ordinary math atom.

See math decorations.