def _inline_styles(self):
        """
        Downloads the assets from the style URL list, clears it, and adds
        each style with its embedded asset to the literal style list.
        """
        styles = self._get_styles(self.assets.style_urls, url_for('asset'))
        self.assets.styles.extend(styles)
        self.assets.style_urls[:] = []
Downloads the assets from the style URL list, clears it, and adds
        each style with its embedded asset to the literal style list.