2.2.12 [CSS-Level2-2009] Section 13.3.1, Page break properties: 'page-break-before', 'page-break-after', 'page-break-inside'

C0021:

The specification states:

 Left
  
 Force one or two page breaks before (after) the generated box so that the next page 
 is formatted as a left page.

All Document Modes (All Versions)

The left value of the page-break-before and page-break-after properties is interpreted as always as per the specification statement: "Whether the first page of a document is :left or :right depends on the major writing direction of the document. A conforming user agent may interpret the values left and right as always."

C0022:

The specification states:

 Right
  
 Force one or two page breaks before (after) the generated box so that the next page 
 is formatted as a right page.

All Document Modes (All Versions)

The right value of the page-break-before and page-break-after properties is interpreted as always, as per the specification statement: "Whether the first page of a document is :left or :right depends on the major writing direction of the document. A conforming user agent may interpret the values left and right as always."