Rendering PDF using Ferrum sometimes loses landscape

[davidwessman]

Hello!

I am using Ferrum to generate PDFs from HTML.
We are testing out a new layout for the PDF which uses our new layout.

However, if I pass the new HTML it will not write it as landscape even if the option is given.

  # Inspired by:
  # https://gist.github.com/forsbergplustwo/da777dd47f343408ad9adc29e21ad674
  def self.generate(html, footer_text: "", wait_for_status: nil, wait_for_timeout: Platform.pdf_timeout_in_seconds, landscape: false)
    browser = Ferrum::Browser.new(
      headless: true,
      process_timeout: Platform.pdf_timeout_in_seconds,
      timeout: Platform.pdf_timeout_in_seconds
    )

    intercept(browser: browser, html: html)
    browser.go_to(FAKE_URL)
    wait_for_page(
      browser: browser,
      wait_for_status: wait_for_status,
      wait_for_timeout: wait_for_timeout
    )
    pdf = nil
    Tempfile.create do |tempfile|
      browser.pdf(
        path: tempfile.path,
        format: :A4,
        landscape: landscape,
        margins: {
          top: 15,
          right: 12,
          bottom: 15,
          left: 12
        },
        preferCSSPageSize: true,
        printBackground: true,
        displayHeaderFooter: true,
        footer_template: footer_html(footer_text),
        header_template: "<div></div>"
      )
      if block_given?
        yield(File.new(tempfile.path))
      else
        return(File.read(tempfile.path))
      end
    end
    nil
  ensure
    browser&.reset
    browser&.quit
  end

The CSS and HTML-layout is completely different, but I cannot find why it is not landscape with the new layout.

Do anyone have any idea how I can debug this?

[route]

You could set FERRUM_DEBUG=true env variable before running browser and check that all options you pass at least passed to Chrome in the corresponding CDP call.

[davidwessman]

Thank you for the debug variable, I was able to track it down to a CSS-bug in the new layout.