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This is an experimental technology Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
Summary
The bleedat-rule descriptor specifies the extent of the page bleed area outside the page box. This property only has effect if crop marks are enabled using the marks property.
Specifies by how far outward, in each direction, the bleed area extends past the page box. Values may be negative, but there may be implementation-specific limits.