I don’t know how to do it reliably, but one thing that you want to do is to remove any <style media="print"> or @media styles from the page (whether imported, i

I don’t know how to do it reliably, but one thing that you want to do is to remove any <style media="print"> or @media styles from the page (whether imported, inline, browser default, in your local overrides, etc). After that, be prepared for the page size to make the page look different from the screen version. That difference can be striking.