Hover effect for QTextDocument

I wanted to have some hover effect over p tag inside QTextDocument.

I have tried to set QSS for QTextDocument using QTextDocument().setDefaultStyleSheet(). Here's what the result I have obtained;

Script;

from PySide2 import QtWidgets


class Test(QtWidgets.QTextBrowser):
    def __init__(self):
        super().__init__()

        self.document().setDefaultStyleSheet(
            """
p.out{
    background-color: "orange";
    color: "black";
}

p.out:hover{
    background-color: "yellow";
}
"""
        )

        self.setStyleSheet(
            """
QTextBrowser{
    background-color: "black";
    color: "white";
}
""")

        self.setHtml(
            """
<p class='out'> Checking this </p>
"""
        )


test = QtWidgets.QApplication([])

sample = Test()
sample.show()

test.exec_()

Color attribute inside qss worked but the hover doesn't work.

Is there any way of achieving hover effect over fragments of text inside document?

After Understanding, QTextDocument's structure and Syntax Highlighter. We can modify QTextBlock's Format whenever we want. I tried to change it's format using enterEvent, and restore format in leaveEvent.

we can modify box model using QTextFrame using QTextFrameFormat.

from PySide2 import QtWidgets, QtGui


class High(QtGui.QSyntaxHighlighter):
    def __init__(self, doc):
        super().__init__(doc)

        self._formats = tuple(
            QtGui.QTextCharFormat() for _ in range(2)
        )

        self._formats[1].setForeground(
            QtGui.QBrush(QtGui.QColor("orange"))
        )

        self._formats[1].setFontWeight(3)
        self._formats[1].setFontUnderline(True)
        self._formats[1].setFontPointSize(12)

    def highlightBlock(self, text: str):
        self.setFormat(
            0, len(text), self._formats[self.currentBlockState() if self.currentBlockState() > -1 else 0]
        )


class Sample(QtWidgets.QTextBrowser):
    def __init__(self):
        super().__init__()
        self.lighter = High(self.document())
        self._prev = None

        self.insertBlock("This is a sample line\n")
        self.insertBlock("Can also be a\nparagraph thing\n")
        self.insertBlock("it's a block, Bye!")

    def insertBlock(self, text):
        cur = self.textCursor()
        cur.block().setUserState(0)  # default: -1

        cur.insertText(text)

    def mouseMoveEvent(self, eve):
        super().mouseMoveEvent(eve)

        cur = self.cursorForPosition(eve.pos())

        if cur.block() == self._prev:
            return

        self.restore()
        cur.block().setUserState(1)
        self.lighter.rehighlightBlock(cur.block())

        self._prev = cur.block()

    def restore(self):
        if not self._prev:
            return

        self._prev.setUserState(0)
        self.lighter.rehighlightBlock(self._prev)
        self._prev = None

    def leaveEvent(self, eve):
        self.restore()
        super().leaveEvent(eve)


testing = QtWidgets.QApplication([])
sample = Sample()
sample.show()
testing.exec_()