def _build_html_header()

in python/datafusion/html_formatter.py [0:0]


    def _build_html_header(self) -> list[str]:
        """Build the HTML header with CSS styles."""
        html = []
        html.append("<style>")
        # Only include expandable CSS if cell expansion is enabled
        if self.enable_cell_expansion:
            html.append(self._get_default_css())
        if self.custom_css:
            html.append(self.custom_css)
        html.append("</style>")
        return html