> So are you looking at Chrome (and Firefox) back to 4-5 years past (via caniuse?), and not using something if they don't support it back that far?
I don't think that's whats the author meant, since they mentioned progressive enhancement. The site in question was for making a reservation to volunteer. This could have been written as a simple HTML form and it would have worked on any version of Chrome/Firefox/Safari and most other browsers. Any dynamic feature the site authors wanted to add should have used [feature detection](https://developer.mozilla.org/en-US/docs/Learn/Tools_and_tes...).
You can also use JS modules and `nomodule` script tags to deliver the latest and greatest JS to modern browsers and a compiled ES5 script to older browsers (though that wouldn't work in the case of an older evergreen browser that does support modules)
I don't think that's whats the author meant, since they mentioned progressive enhancement. The site in question was for making a reservation to volunteer. This could have been written as a simple HTML form and it would have worked on any version of Chrome/Firefox/Safari and most other browsers. Any dynamic feature the site authors wanted to add should have used [feature detection](https://developer.mozilla.org/en-US/docs/Learn/Tools_and_tes...).
You can also use JS modules and `nomodule` script tags to deliver the latest and greatest JS to modern browsers and a compiled ES5 script to older browsers (though that wouldn't work in the case of an older evergreen browser that does support modules)