Returns:
            str: Content of tag (everything between `opener` and `endtag`).

def getContent(self):
        """
        Returns:
            str: Content of tag (everything between `opener` and `endtag`).
        """
        if not self.isTag() and self._element:
            return self._element

        if not self.childs:
            return ""

        output = ""
        for c in self.childs:
            if not c.isEndTag():
                output += c.toString()

        if output.endswith("\n"):
            return output.rstrip()

        return output