The ornamental design for an accessory for head-mounted display, as shown and described.
FIG. 1 is a perspective view of front, top and left side of an accessory for head-mounted display showing our new design;
FIG. 2 is a perspective view of front, bottom and right side thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof;
FIG. 9 is a reference view of usage thereof;
FIG. 10 is a reference view with the article removed thereof; and,
FIG. 11 is a reference view showing the partially enlarged portion of FIG. 10 thereof.
The portions of the article in broken lines are shown for illustrative purposes only and form no part of the claimed design. The dot and dashed lines mean a boundary between the claimed portion and the non-claimed portion.