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calibre used to use Qt WebKit, that has been deprecated and no longer maintained. Which is particulary dangerous since it means it no longer gets security updates. The replacement for it is Qt WebEngine, which calibre 4 has now moved to. And as a matter of fact, calibre actually makes less use of Qt WebEngine than it did of Qt WebKit, precisely because Qt WebEngine is rather fragile and heavyweight. That is why for instance, the main calibre GUI no longer uses webkit/webengine to display and edit comments.
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