I have had a similar error report for one of my books, comprising separate xhtml chapter files, all identical in xhtml structure, but only one chapter file from one book throws the error. I have examined it until my eyes are popping out, but there are no instances of attribute "clear" being used anywhere, either in a <br /> tag (old html allowed that) nor in any <div> or <span> tags. The error message specifies 5 different lines in my one errant chapter file (all identical to similar lines in hundreds of other chapter files), and I am suspicious because all lines include a <br /> tag, and I have read somewhere that a <!DOCTYPE... declaration can sometimes cause this error because of the DTD part of the declaration. It can sometimes assume that "clear" is a default attribute for some tag (probably the <div> tag). But all my <!DOCTYPE... declarations are also identical. It's a puzzler! It seems to be assuming that any <br /> tag includes a "clear" attribute, when none of them do.
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