Function add_class 

pub fn add_class(sel: &Selection<'_>, class: &str)

Add a class to the element.

Example

use html_cleaning::dom;

let doc = dom::parse(r#"<div class="foo">Content</div>"#);
let div = doc.select("div");
dom::add_class(&div, "bar");
assert!(dom::has_class(&div, "foo"));
assert!(dom::has_class(&div, "bar"));