## Letterbox size indicator (appearing on the bottom of the viewport)
# Shows the current tab's letterboxed vieport size when resizing.
# "Letterbox(ing)" should be treated as a feature/product name, and likely not changed in other languages.
# The "×" symbol is a unicode (U+00D7) symbol for multiply.
# $width (Number) - The window width. The "NUMBER" function will format this number to the same locale, and the "useGrouping" option will remove grouping symbols, like thousand separators.