2.2.1 [W3C-RUBY] Section 2.2, The ruby element

C0001:

The specification states:

 The ruby element is an inline (or text-level) element that serves as an overall 
 container. It contains either the rb, rt and optional rp elements (simple ruby 
 markup) or the rbc and rtc elements (complex ruby markup).

All Document Modes (All Versions)

The dir attribute is not supported in simple or complex ruby elements.

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