Since I always see a <br class="calibre1"/>, is that construct added by Calibre's conversion process? Perhaps to handle the MOBI case Sarmat89 noted, above?
Of course, I see tons of non-Calibre classes used in the same way (and in things like <i class=...>, <b class=..., <em, strong, sup, sub, etc., etc.). And, as JSWolf suggested, I just convert them back to their base tags.
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