Measurement Units for Image Sizing

When you set the value for a width, depth, contentwidth, or contentdepth attribute, you can use any of these units:

px: Pixels are the default unit if none is specified.
pt: Points equals 1/72 of an inch.
cm: Centimeters
mm: Millimeters
pc: Picas equals 1/6 of an inch.
in: Inches
em: Ems (the font size of the current surrounding element)
%: Percentage of the available page area for width and depth OR original image size for contentwidth and contentdepth.

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