Error codes · Markup
PW5036
form_control_value
The program must hold to this: a form control's value is written where HTML reads it: a <textarea>'s as its text, a signal or text, once; a <select>'s by the option it marks selected.
The decisions behind it
Reading the diagnostic
pw check prints the code in brackets, [PW5036], with the sentence above and the place in your program. Errors and diagnostics explains how to read one, and every code is listed with its rule.