Documents with “text-align: justify” are not interoperable today, so any specs involves some costs. We need to make a choice which costs to take and which not to.

Following criteria are out of scope of this discussion:

• text-align is not justify. The choice does not make any differences in this case.
• has lang attribute. The spec says UA may tailor by the content language.
• text-jusitfy: inter-word. The spec defines behavior in this case.

Expand CJ

Expand ideograph (i.e., between ideograph and any), but not Hangul

Solid CJK

Not expand ideograph nor Hangul

Compromise

A compromised algorithm, spacing varies by the content of line

Reintroduce inter-ideograph

Add text-justify: inter-ideograph back

Table of expansions:

• All cases in single HTML file (screenshots)
• List of all test files and screenshots (or in Dropbox if unstable)

Letters represent quality of results

* Adding inter-ideograph can make this A.

• + indicates better
• - indicates worse
• o indicates same