There are 2 kinds of lines here:

• Regular lines are prose, but you can also insert named blanks into them using the syntax [value|name], which renders vertically across 2 lines. You can't nest blanks within blanks. These lines can wrap, but a single blank can't wrap across multiple lines on screen.
• Indented lines (though the indentation is currently subtle) are code. They can render fractions using the syntax (a/b) as I showed before. (Not sure I'll keep this in the long term.) You can nest fractions within fractions. These lines don't support wrapping.

Planned:

• synchronizing blanks with the same name
• using code in indented lines to compute derived names without values inline

Inspirations:

• Kragen Sitaker's bicicleta
• Jonathan Edwards's Subtext 1

This post is part of my Freewheeling Apps Devlog.

Comments gratefully appreciated. Please send them to me by any method of your choice and I'll include them here.