pub fn assemble_preview_painted(source: &str) -> Result<String, ParseError>Expand description
assemble_preview with the page’s first_paint already in the frame’s body, marked for the
page’s mount to adopt, so the frame shows the page the moment its document parses rather than
once its module has run, and a frame that reloads with the same page shows it throughout. A
program with no first paint is previewed as assemble_preview previews it.