This function converts a plot to a base64 image and adds it to the
HTML content.
Usage
add_plot_to_html(html_content, plot_element, plots_size, section_index)
Arguments
- html_content
The current HTML content as a character string.
- plot_element
The plot element to be converted to base64.
- plots_size
An integer specifying the height of the plot.
- section_index
An integer specifying the section index.
Value
The updated HTML content as a character string.