Page 1 of an Arabic packet lifts the English 3x4 poster, and the
poster inherited the page's dir="rtl": English punctuation jumped to
line starts, the header's key and value columns collided, names ran
into their numbers, and four text blocks were pushed off the sheet's
left edge (rendered and measured in print emulation). The Chinese
packet, which is ltr, was intact.
The lifted sheet's wrapper now pins dir="ltr". The packet's own title
stays rtl; the relabelled Arabic country names are single runs, so they
keep their order.
check-packet-a1-structure asserts the pin on both kinds of sheet; it
fails without it.
c8dcb02e97