16.4. XHTML 1.1In May 2001, the W3C released an updated the XHTML standard, XHTML 1.1. While most standards expand upon their previous versions, XHTML 1.1 takes the unusual step of defining a more restrictive version of XHTML. If you think of XHTML 1.0 as unwieldy, picky, and time consuming, you'll find XHTML 1.1 even more so. In our opinion, XHTML 1.1 is an example of the standards process taken to absurd levels, defining a standard that may be academically pure but is essentially unusable. 16.4.1. Differences in XHTML 1.1XHTML 1.1 begins with the XHTML 1.0 strict DTD and makes a few modifications. By supporting only the strict version of XHTML 1.0, version 1.1 eliminates all deprecated elements and all browser extensions still in common use on the Web. It also makes the following minor changes:
Finally, the XHTML 1.1 standard defines a new set of elements that implement a typographic feature known as ruby text . Ruby text is short runs of text placed alongside the base text; it is often used to annotate the text or to indicate pronunciation. Ruby text has its roots in East Asian documents, particularly Chinese schoolbooks and Japanese books and magazines. Ruby text is typically displayed in a smaller font [*] than the base text and follows certain alignment rules to ensure that it appears adjacent to the appropriate base text element.
You define and manage ruby text with a set of elements that provides grouping and layout control. We'll be blunt: this new feature is so esoteric and of so little importance to the vast majority of HTML authorseven those who would subject themselves to the needless agony of XHTML 1.1 conformancethat it does not warrant extensive coverage in this book. Those who are interested can find a complete discussion of ruby text at http://www.w3.org/TR/ruby. For the rest of us, it is sufficient to know that there are a few new elements in XHTML 1.1 that you would be wise not to use in your own DTDs, if only to prevent confusion with the XHTML 1.1 DTD. These new elements are:
Should you encounter any of these elements in a document, refer to the aforementioned specification for details on how they are used. In general, you'll find a single outer <ruby> element with at least one <rb> and <rt> element within it. You can collect multiple <rb> and <rt> elements within an <rp> element or group them within the <rbc> or <rtc> container element. |