

I wouldn’t mind paying a few cents, but 8€ is way more than what he could possibly get out of the ads.
I wish a system like Flattr or even BAT could take off. Paying a few dollars a month to not get ads anywhere in a sustainable way seems like the way to go.
(Note: I seem to remember shady stuff about the BAT token but I do not know the details. Don’t incendiate me on that).












There is this tool if you use stylelint for linting: https://github.com/RJWadley/stylelint-no-unsupported-browser-features
Given that your website is very simple, I assume it would be a pretty big rabbit-hole to dig into.
It wouldn’t reveal the oldest version of each browser compatible with your website, but it would check your css against a predefined list, and alert you if you use something that is not compatible.
Otherwise, if you are ok with checking manually, check out BrowserStack: https://www.browserstack.com/ It’s neither free or open source, but it simplifies testing on many browsers. There is a free plan as well.