The ability to display webpage text in vertical format is highly desirable for Chinese, Japanese, and possibly other languages. Recently I checked Safari 4.0.3, FireFox 3.5.2, and Opera 9.64 and found that they still cannot do this in OS X, using this test page.
Same failure for Google Chrome.
I understand that Win IE (starting with version 5.5) is the only browser which has this feature.
Can it really be so difficult?