br
Ends the current line and starts a new line, represents a line break of a size equal to the current line-height. You can use the clear attribute to move succeeding text below any active floating image.

attributes

id
Provides an element with a unique name within a single document. This is especially useful in works with extensive cross-referencing and linking, such as dictionaries, encyclopedias, or travel guides. Use of ids simplifies linking and updates.
class
Affiliates an element with one or more classes.
style
Attaches a list of inline (name:value paired) CSS properties to a specific tag, for example: style="name:value;name:value"
Note: Media types other than "text/x-oeb1-css" will be ignored with a warning in a document of type "text/x-oeb1-document".
title
This attribute is ignored.
clear="(left|right|all|none)"
Сontrols the relationship between text and images embedded in it and allows text that is wrapping around an image to resume flowing after the end of the image. The default value, none, is the same as not using clear tag.
Note: The values left and right are equivalent to all in version 1 of Microsoft Reader.