W3C CSS2 Cascading Style Sheets, level 2 - instructional media + ...

13.2.3 Crop marks: the ’marks’ property
’marks’
Value: [ crop || cross ] | none | inherit
Initial: none
Applies to: page context
Inherited: N/A
Percentages: N/A
Media: visual, paged
In high-quality printing, marks are often added outside the page box. This property
specifies whether cross marks or crop marks or both should be rendered just
outside the page box [p. 176] edge.
Crop marks indicate where the page should be cut. Cross marks (also known
as register marks or registration marks) are used to align sheets.
Marks are visible only on absolute page boxes (see the ’size’ property). In relative
page boxes, the page box will be aligned with the target and the marks will
be outside the printable area.
The size, style, and position of cross marks depend on the user agent.
13.2.4 Left, right, and first pages
When printing double-sided documents, the page boxes [p. 176] on left and right
pages should be different. This can be expressed through two CSS
pseudo-classes that may be defined in the page context [p. 176] .
All pages are automatically classified by user agents into either the :left or
:right pseudo-class.
Example(s):
@page :left {
margin-left: 4cm;
margin-right: 3cm;
}
@page :right {
margin-left: 3cm;
margin-right: 4cm;
}
If different declarations have been given for left and right pages, the user agent
must honor these declarations even if the user agent does not transfer the page
boxes to left and right sheets (e.g., a printer that only prints single-sided).
Authors may also specify style for the first page of a document with the :first
pseudo-class:
Example(s):
@page { margin: 2cm } /* All margins set to 2cm */
@page :first {
margin-top: 10cm /* Top margin on first page 10cm */
}
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