"The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it."
Terry Pratchet, Diggers
We used to send our clients an external link to report their browser's viewport whenever they have a styling issue for any pages on their website.
But with the link no longer available, and other new links not always reliable - we have decided to implement a simple one on our own website.
So, if you need to know your browser's viewport, you can use the link above.