[css-writing-modes-3] Error in Example 17 (<date>2010年2月23日</date>), §9.1.3.1 Full-width Characters

Elika, Koji,

I think there is an error in

https://www.w3.org/TR/2015/CR-css-writing-modes-3-20151215/#text-combine-fullwidth

which is not easily noticeable and specifically regarding the way the 
"23" should be displayed.

Please load

http://www.gtalbot.org/BrowserBugsSection/CSS3WritingModes/Example17.xht

into a recent version of Firefox (say, 49.0a1 buildID=20160528030208) or 
Chrome (say, version 52.0.2743.10).

The spec uses the right-most column when it should use the middle 
column.

Example 17 could also use a bigger font-size so that this would help 
understanding of the example.

Gérard