Function syntect::html::append_highlighted_html_for_styled_line

pub fn append_highlighted_html_for_styled_line(
    v: &[(Style, &str)],
    bg: IncludeBackground,
    s: &mut String
) -> Result<(), Error>

Like styled_line_to_highlighted_html but appends to a String for increased efficiency. In fact styled_line_to_highlighted_html is just a wrapper around this function.