This is tough as meaning is no longer specific. Devices meant media queries. Or, enhance a site with browser-based CSS like -moz etc. But what "content" and "web site" meant pre smartphone, autos, etc. has really challenged the "write once style anywhere". Web app ca 2005? Gmail.
Mary Baum @marybaum
22 Feb 2021
Replying to @mholzschlag
I also see us selling “Responsive Design! So your site will look great on any device!” Responsive design, but for the grace of core image-handling in my favorite CMS, will download the desktop version of that restaurant’s site to your phone while you’re sitting in its bar.

Feb 22, 2021 · 2:05 PM UTC

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Replying to @mholzschlag
Yes. Though for me, it’s all WordPress, and WordPress does so much more than blogging. Also, I can tell you that the attention to a11y is pervasive, even including the language we use on the About page: “Be careful with words like See, Mary. Not everyone can.” (Um, yeah 👓👓)