class HTMLProofer::Check

def add_to_internal_urls(url, line)
  url_string = url.raw_attribute
  @internal_urls[url_string] = [] if @internal_urls[url_string].nil?
  metadata = {
    source: url.source,
    filename: url.filename,
    line: line,
    base_url: base_url,
    found: false,
  }
  @internal_urls[url_string] << metadata
end