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To write a rectangular price grid in html.
In a nutshell, the grid will show a price per cell. Each cell has a unique id based on the row/column headers. The grid can be loaded from json, and will send json to the server.
The grid cells can be edited to take prices to 2 decimal places.
There will be 5 fixed columns on the grid, with headers named A to E.
The number of rows is variable. There should be one row to start with.
A row can be added by pressing a "+" icon somewhere outside the grid.
The first cell of every row must take a string, given by the user, that will be the unique ID of that row. The rest of the cells take decimals.
The maximum number of rows is 20, and should be a constant in the code.
Only the last row can be deleted.
Finally there will be a "Save" button that will form the json data structure for the entire grid as a list of key-value pairs, ready to be posted to a URL.
Every cell can be identified by its unique row + col headings, so the first row, giv...
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