A field is declared inline:

print("'B333'<32|username'>'b") empty

print("'B333'<40|city'Berlin>'b") pre-filled

print("'B333'<!32|password'>'b") masked

The value arrives at the next page as field_username, and so on.

A link may carry data. Everything after the second backtick is a

pipe-separated field list:

'[Save':/page/thing.mu'action=save|id=7|session=abc|*]

Entries with an equals sign arrive as var_*. Bare names name a field on the

current page to submit. A lone asterisk means "submit every field on this

page".

Three rules that are not optional:

- A field's pre-filled value cannot contain a newline. The parser reads it

from the backtick that ends the field name to the next '>', so a stored

newline makes the field unrepresentable and the whole field is silently

dropped. Edit multi-line text one field per line and rejoin on save.

- A ']' inside a link label ends the link early and dumps the rest of the

markup into the page as visible text. Titles built from data must have

brackets stripped before they go in a label.

- A '>' inside a pre-filled value truncates the field for the same reason.

None of these announce themselves. They produce a page that looks nearly

right and quietly loses data.

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