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Some warnings/errors, calibre knows how to automatically fix. You will see a message to the effect of "Fix this automatically".
For example, a font that has different names in the CSS and in the font file.
Other warnings/errors cannot be fixed automatically, because they require a user decision to resolve.
"Try to correct all fixable errors automatically" will fix all of them in bulk -- but only if calibre knows how to fix that error.
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