Do not put square bracket [[]]. Do not put "|100px" here.
width
recommended
Recommended because it can prevent lengthy text to inadvertently enlarge the box. See examples below for the reason why we need 2 instances of width. Just an integer, not "100px". Highly recommend to use an even number.
alt
recommended
empty
Alt text for readers who can't see the image; see WP:ALT
caption_left
optional
Row/Border disappears if both missing
caption_right
optional
footer
optional
position
optional
(none)
left or right
margin
optional
4(px)
Just put an integer, not "4px", not "4em"
background
optional
(none)
#CCCCFF (please don't put quotation mark)
範例
Parameters fully used (except background)
500 Japanese yen
Paulownia, state title, value
Value, bamboo, Mandarin orange, year of minting, latent image
{{Coin image box 1 double
| header = 500 Japanese yen
| image = Image:500JPY.JPG
| alt = Two sides of a coin. The front contains a plant and the back contains "500" in big digits.
| caption_left = Paulownia, state title, value
| caption_right = Value, bamboo, Mandarin orange, year of minting, latent image
| width = 200
| footer = footer text here
| position = right
| margin = 0
}}
{{lorem ipsum}}