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<br clear> has been deprecated for 13 years now (i.e. since HTML 4.0), and as such is not part of xhtml 1.0 "strict", xhtml 1.1, EPUB 2.0, HTML5, or EPUB 3.0.
The clear attribute in CSS1 from 15 years ago is intended to replace it. To be fair, the initial CSS implementations were horrible, so the realistic deprecation time-scale is probably closer to a round decade.
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