XML and Namespace Declarations
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Not including the <?xml...?> declaration at the top.
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Not including xmlns="http://www.w3.org/1999/xhtml" attribute in the <html> tag.
Epubcheck would say that none of your tags are supported by the “” namespace.
Break, Formatting, and Paragraph Tags
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Break tags that look like <br> instead of <br />.
Epubcheck would say that it finds an unexpected closing tag that wasn’t </br>.
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Paragraph tags (<p>) that aren’t closed (</p>).
Epubcheck will run into the next <p> and complain about it.
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Break tags and text formatting tags (like <tt>, <i>, <em>, <b>, <strong>, <font>, etc.) that exist outside of paragraphs.
Epubcheck will tell you they don’t belong there.
Lists
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Tags that were formerly allowed to run free without a closing tag can do so no longer. This includes li, dt, dd.
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Bare list item tags (li, dt, dd) are no longer allowed; they must be inside closing ol, ul, or dl tags.
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Lists don’t belong inside paragraphs; they must be outside of them.
Headers
Images
Anchors, aka “Missing Fragments”
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Using <a name="..."> tags instead of the id attribute when creating anchors. Example: instead of
<a name="illus_christmas_morning"></a><p>...</p>
Use instead
<p id="illus_christmas_morning">...</p>
When you want to link to the anchor (aka “fragment”), you still use
<a href="text.html#illus_christmas_morning">Christmas Morning</a>
either way.
This error generates by far the weirdest epubcheck error, where it complains that fragments are missing.
The id way is cleaner anyways.
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An anchor is also considered missing if the HTML around it is invalid for some reason.
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