The description for value "left" says: "If this is the leftmost region of text flow on this line, advance the text to the next position on the line. Otherwise, treat this as a text wrapping break of type all… If the parent paragraph is right to left, then these behaviours are reversed."
We don’t think this is correct for leftmost region of the line in RTL paragraphs.

The phrasing should be: "If the parent paragraph is right to left and this is the leftmost region of text flow on this line, advance the text to the next position on the next line."

Put in a clearer description here of what happens in an RTL paragraph.

"ST_BrClear (Line Break Text Wrapping Restart Location)"
, page 1686 Section 2.18.5

ed

Proposed Disposition of DIS 29500 Comment IL-0018 (Modified: 2007-12-08) Agreed; this text needs to be clarified for RTL cases; the following changes will be made to Part 4, §2.18.5, page 1,687, in the table row for the enumeration value “left”: left (Restart In Next Text Region Left to Right When In Leftmost Position ) Specifies that the text wrapping break shall behave as follows when this line intersects a floating object : If the parent paragraph is left-to-right: If this line is broken into multiple regions (a floating object in the center of the page has text wrapping on both sides: If this is the leftmost region of text flow currently on this line, o If a floating object occurs to the left of the break, treat this as a break of type all . o Otherwise, advance the text to the next position on the line where text can be displayed Otherwise, treat this as a text wrapping break of type all none . If this line is not broken into multiple, then treat this break as a text wrapping break of type none . If the parent paragraph is right to left , then these behaviors are also reversed. : If the object occurs to the left of the break, treat this as a break of type all . Otherwise, treat this as a text wrapping break of type none . In either case, if this line does not intersect a floating object, then treat this break as a text wrapping break of type none . [Note: This break type is used to control the text wrapping on the left side of a floating image without preventing text from appearing on the opposite side. end note]