Description

The rbc (ruby base container) element groups a collection of rb elements that will have related annotations in a subsequent rtc container. In the example shown above, which was taken from the W3C documentation, the rbc contains four Japanese characters (the more complex kanji symbols), each of which has its own rb element. Meanwhile, the ruby annotations inside the related rt elements are written in hiragana syllables (known as furigana when used for this purpose). Finally, there’s an English annotation that spans all four of the previous rb and rt elements.

The intended rendering of this code is shown in Figure 1. However, only the first image in the example is behaving—and that’s because it’s a suggested rendering in the W3C documentation. The code’s true rendering is shown in the following two images, which are taken from Internet Explorer and Firefox, respectively.

Figure 1. Poor levels of support for rbc and rtc elements