Build-a-cat

[Tad Carlucci]

I've not checked High Sierra recently but, when I did, early this year or late last year, it worked fine.
Charm uses it on her iPhone SE all the time, and I just checked on my iPhone 4s, looks good to me.
Also looks good on an old Android tablet as well, of course, as my Windows 10 and Arch Linux desktops using Chrome, Chromium, Firefox, IE and Edge.
Heck, it even works on IE8 on Windows XP.
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ETA: Forgot the grandson has an iPad, so I just raided his desk and checked: looks good there, too.
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I used to check Opera, but the desktop version is just Chromium with a couple minor UI changes. Don't have any devices which can run Opera Mini. There are far too many niche and tiny market-share browsers to try them all, so I stick with the ones you're actually likely to meet in Real Life.
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It just occurred to me, I have WAY too many computers laying around this house! I remember my friend had a DEC PDP-11 and a TI-990 filling his living room and I used to say I'd never want a computer in my house, much less two. Then the PC model 1 came out. *sigh*
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Final edit, promise. Just read the post: No, no flash. The page is a static, single-file web page with the CSS and Javascript directly embedded. The only third-party elements are the Paypal images and, of course, the KittyCatS! images from their Pedigree and Cattery pages. So you can only break it if you disable CSS, disable Javascript, or disable automatic loading of third-party images. I imagine some old browsers (Opera Mini fits that bill, IE4 would, too) won't be able to handle the CSS, Javascript, or the drop-down form elements but there's nothing for that except upgrading to something from this millennia.