The conventions for choosing class names are outside the scope of this specification.CLEARThis attribute is common to all block-like elements. The CLASS attribute is most commonly used to attach a different style to some element, but it is recommended that where practical class names should be picked on the basis of the element's semantics, as this will permit other uses, such as restricting search through documents by matching on element class names. By convention, the class names are interpreted hierarchically, with the most general class on the left and the most specific on the right, where classes are separated by a period.

The language attribute is composed from the two letter language code from ISO 639, optionally followed by a period and a two letter country code from ISO 3166.CLASSThis a space separated list of SGML NAME tokens and is used to subclass tag names. It can be used by parsers to select language specific choices for quotation marks, ligatures and hypenation rules etc. 'en.uk' for the variation of English spoken in the United Kingdom. Identifiers are NAME tokens and must be unique within the scope of the current document.LANGThis is one of the ISO standard language abbreviations, e.g. Permitted Attributes for the OL ElementIDAn SGML identifier used as the target for hypertext links or for naming particular elements in associated style sheets. Implementors of HTML 3.0 user agents are advised to cater for this possibility in order to handle badly formed legacy documents. Note: Some legacy documents may include headers or plain text before the first LI element.

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