Many of the basic elements are supported across all major browsers, but the same can't be said for a number of the elements that seem less obviously useful. At this moment, the
<figure> tag for attaching a movable figure to a section of text will work in Firefox 4.0 but not in Safari. The
<ruby> tag used to annotate Asian symbols sort of works with Safari but not with Firefox.
Saying that a tag is "supported" here is not as straightforward as with other HTML5 features -- the semantics require more specification. It's one thing to write down requirements to store data, but it's another to specify just what a browser should do when laying out blocks of text. Even after the browsers start recognizing these tags, the browsers will probably choose to display the information inside the tags in slightly different ways.
Many of the ideas that ended up in this collection seem tiny or inconsequential, but underestimating them would be a mistake. Although they are often just patches or fixes to ideas that date from the beginning of the Web, they open the door for many of the newest, savviest Web crawlers to extract more information from the pages.
While the first effect of these rules will be to improve the display and layout, they could also unlock deeper features by making it easier for computers to understand exactly what is going on. The newer tags do a better job of indicating the role of the text in the document, and this may aid artificial intelligence in making better sense of the text between the tags.
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