"I have been using the offline Validator S.A.C. but it quit working when Apple released El Capitan. The other Apple friendly validators either don't work or are pathetic. I dusted off my Dell and upgraded my old version of CSE ... Wow! Your validator found critical errors that the S.A.C. program completely ignored."
"I bought Parallels and Windows just to be able to run CSE HTML Validator Pro on my Mac - and it was totally worth it."
"WINE has clearly made great progress since I first tried it some years ago, and now allows easy installation and fully functional execution of CSE HTML Validator and several other w32 tools I use with some regularity. But it's the fact that I can use CSE on an Ubuntu box that floats my boat. I can't think of another digital tool that provides me with such effective notice of my errors coupled with sophisticated learning aids."
"Moving from the PC to a Mac was wonderful. The ONLY software I couldn't find on the Mac was CSE HTML Validator, therefore I bought Virtual PC for the Mac just so I could run CSE. It is the best HTML/XHTML editor and validation tool on the market, and the only one I recommend to fellow Web professionals and my students."
"I bought CSE HTML Validator Pro almost 6 months ago, and have since switched to a near-full-time Linux user. However, I've managed to find an equivalent or better product for every Windows-only product on Linux...except CSE HTML Validator. CSE HTML Validator remains the only stumbling block that keeps me going back to Windows."
We are often asked if there is a Mac or Linux version of CSS HTML Validator available. We do not have native Mac, Linux, or Unix version but you can still run CSS HTML Validator using a method described below.
Use Parallels Desktop to run Microsoft Windows® and Windows applications on your Mac. This is popular software that many people use to run Windows applications on their Macs.
You can use VirtualBox (FREE) to run Windows on a Linux, Macintosh or OpenSolaris host. This will let you run CSS HTML Validator and other Windows programs.
Intel based Macs can also use VMware Fusion.
Testing of CSS HTML Validator v12 (an older version but newer versions should work too) on Mac OS X confirms that it runs using Wine, a compatibility layer capable of running Windows applications on several POSIX-compliant operating systems, such as Linux, Mac OS X, & BSD. However, the interface may not appear as 'polished' as it is when run on Windows. There may also be some display (GUI) anomalies. Other features that may not work are 1) downloading and link checking HTTPS links, 2) the integrated web browser, 3) update checks (because they use HTTPS).
Unfortunately, installing Wine can take some time, but all components are free and it doesn't require the purchase of Microsoft Windows like Boot Camp and Parallels Desktop do.
There are also other solutions from various vendors for running Windows programs on other host platforms.