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Implementation status

The Ruby Annotation markup specification defines two levels of conformance. Implementations can support just simple ruby markup, or both simple and complex markup.

Internet Explorer 5+ supports simple ruby markup in various types of document. Although the actual implementation is not exactly the same as the specification, it still does the right thing with standard markup. This means that when rendering it places ruby text above base text and removes any characters in rp elements. Since this markup is not standard for HTML or XHTML 1.0, we cannot advise that you use it for those formats (your pages will no longer validate). However, simple ruby is also supported for XHTML 1.1 documents, where its use is valid.

The W3C browser, Amaya, supports both simple and (to a large extent) complex ruby display.

There is an extension for Mozilla, Netscape 7 and Firefox browsers that supports both simple and complex ruby, including rbspan, for pages served as "application/xhtml+xml" (not as "text/html"). However, the download location warns that:

"This extension sometimes causes crush when you show popup menus, load webpages, or operate tabs, because it intrudes into operations about loading pages. Please don't use it if you would like to use stable browser."

Masayasu Ishikawa also wrote an article that proposes some workarounds for rendering simple ruby in Mozilla/Firefox, Safari and Opera version 8.

There are some tests for simple and complex ruby markup on the W3C site.

Internet Explorer also provides very limited support for some of the CSS3 Ruby Module properties, but not always using the same property values as defined in the specification. Otherwise you are unlikely to find support for these properties yet - which is hardly surprising, since the specification is not yet a recommendation.


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