three decades to learn ...

 In the early days of website development, an important issue was screen size. Back then the answer was make the web page a fixed - smaller - size so i fit on all screens. as screen sizes increased for PCs and got smaller for laptops, flexible pages were used [they adjusted to the screen size]. Then came touchscreens, generally they were smaller and so we got just coding for them - and as well as flexible for all size screens. Of course, this is the abbreviated history - and I've not even started on the web page layout changing on different devices. Oh, and my book this comes under usability.

The solution back then was 'test the site on multiple screens', and it should still be the case. Not always it seems.

I was searching for a hotel, so after entering my search criteria I needed to click on 'search' [obviously].

This is a screenshot from my iPhone ...

And this is the same page on my iPad mini.

As it happens, I was searching on the latter - and because of the design there was no 'search' button. I could not scroll up, down or across. As I'd used the site before I knew that slither of green was the search button, but on a touch screen I could not 'touch' it. Result? No booking. Would a marketer ever sign-off on a website on which making a sale was impossible?

Note that I checked the page on my iPhone just for this blog. I used my PC to make the booking*. And if any tech person is reading this and saying 'well you booked the room, so no problem' ... you're missing the point. Completely. 

* I've changed the real date and destination 😏