If an ePub has improperly nested tags, that breaks the XHTML spec, and no proper XML reader is expected to read it. Now, more viewers are using an HTML renderer that's been pre-packaged, and will be much more lenient (accepting HTML4 rather than XHTML, which is against ePub spec, and so on)... but it doesn't mean those apps are right against ADE.
When ADE hits an improperly nested tag it ends that file right then and there, and will page break into the next XHTML file. This is true for the 900 as well.
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