pub fn text_width(text: &str, em: f64) -> i64Expand description
The width of a story text’s block: a full-width character is one em, the
space, digits and other ASCII narrower. CSP does not lay the block out
again when it opens the page, and breaks a text wider than its block
(a shown ノンブル - 1 - lost its last -), so the narrow characters are
given as much as the widest fonts take.