blank.txt

    import sys
    from os.path import abspath
    from PySide6 import QtGui, QtWebEngineWidgets, QtCore, QtWidgets, QtWebEngineCore
    from ui_docViewer import Ui_docViewerWindow


    class Window(QtWidgets.QWidget, Ui_docViewerWindow):
        def __init__(self):
            super().__init__()
            self.ui = Ui_docViewerWindow()
            self.setupUi(self)
            self.setWindowTitle("Documentation Viewer")
            self.load_html()

        def load_html(self):
            html = abspath("my_docs.html")
            url = QtCore.QUrl.fromLocalFile(html)
            profile = QtWebEngineWidgets.QWebEngineProfile.defaultProfile()
            profile.setUrlRequestInterceptor(CustomUrlRequestInterceptor())
            self.webEngineViewer.setPage(QtWebEngineWidgets.QWebEnginePage(profile, self.webEngineViewer))
            self.webEngineViewer.load(url)


    class CustomUrlRequestInterceptor(QtWebEngineCore.QWebEngineUrlRequestInterceptor):
        def interceptRequest(self, info):
            url = info.requestUrl().toString()
            if url.startswith("http://") or url.startswith("https://"):
                # Allow loading external resources
                info.setHttpHeader(b"Access-Control-Allow-Origin", b"*")
            else:
                # Allow loading local file resources
                info.setHttpHeader(b"Access-Control-Allow-Origin", b"null")


    if __name__ == "__main__":
        app = QtWidgets.QApplication(sys.argv)
        win = Window()
        win.show()
        app.exec()


    <!DOCTYPE html>
    <html>
        <meta />
        <head>
            <title>Some cool documentation :0</title>
            <script src="qrc:///qtwebchannel/qwebchannel.js"></script>
            <script async="async" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-MML-AM_CHTML"></script>
        </head>
        <body>
            <p>
                Hello! This is some cool documentation...

                \[x+x^2\]
            </p>
        </body>
    </html>