 High-end renderers as found in Desktop Publishing software should therefore be able to render this space using the same glyph as the breaking thin space U+2009, handling the non-breaking property internally in the text renderer/layout engine, because line-breaking properties are never defined in fonts themselves; such renderers should also be able to infer any width of space, and make them available as application controls, as is done with justifying/non-justifying.In old-style printed books, when quotations span multiple lines of text (including multiple paragraphs), an additional closing quotation sign is traditionally used at the "beginning" of each line continuing a quotation; any right-pointing guillemet at the beginning of a line does not close the current quotation.This convention has been consistently used since the beginning of the 19th century by most book printers, but is no longer in use today.