The newer convention (designed for proportional fonts) is that 'one' space is sufficient.

One of the initial doubts bloggers raised about the memos was the use of proportional fonts.

Several experts interviewed by the media suggested that the proportional fonts in the documents indicated likely forgery.

Of the legal style guides listed in this section, all use proportional fonts with a single space between sentences in their text.

PostScript tables can contain proportional fonts in various styles and sizes.

Most modern proportional fonts align plain spacing tilde at the same level as dashes, or only slightly upper.

However, many proportional fonts contain fixed-width (tabular) figures so that columns of numbers stay aligned.

If a text is rendered using proportional fonts, widths of character boxes are not equal, but are positive.

Rivers are less noticeable with proportional fonts, due to narrow spacing.

As a result, there is a common belief that double sentence spacing is correct, even given modern technology and proportional fonts.