[KevinH]

Do *not* use setHtml as you are loading xhtml which is a different specification with very different parsing rules that are much less forgiving than the html spaghetti.

Use:

void setContent(const QByteArray &data, const QString &mimeType = QString(), const QUrl &baseUrl = QUrl())


The baseURL is the path to the file as a QUrl, and data holds the contents of the file in bytes (ie. a bytes buffer that you read the entire file into), and of course the proper mimetype: = "application/xhtml+xml"

See the QtWebEngineView online docs:

https://doc.qt.io/qt-6/qwebengineview.html

And for a python example see the calibre source code here:

https://github.com/kovidgoyal/calibr...lay/webview.py

    if force_as_html or load_as_html(html):
        view.setHtml(html, loading_url)
    else:
        view.setContent(QByteArray(html.encode(codec)), mime_type,
                loading_url)
        mf = view.page().mainFrame()
        elem = mf.findFirstElement('parsererror')