If you are not familiar with Wine (or maybe even if you are), you may find the article Understanding Wine helpful. A more complete reference is the WineHQ Wine User's Guide. Also see the Wine List of Commands.
All Terminal commands in this document have been validated by copy/paste from this document into a Terminal window and executed. Consider arranging your browser window and your Terminal window side by side in order to copy/paste the Terminal commands.
Add repository and install Wine
Begin by opening a Terminal window. With the following commands, you add the openSUSE Tumbleweed Wine repository and install Wine.
When zypper refresh asks you to trust it, choose "a" for "trust always".
The first of these commands is a single line with no line breaks.
> sudo zypper addrepo https://download.opensuse.org/repositories/Emulators:Wine/openSUSE_Tumbleweed/Emulators:Wine.repo
> sudo zypper refresh
> sudo zypper install wine
Verify the installation. In my experience, a recent version of Wine Development will have been installed.
> wine --version
Now that Wine is installed, take a look at the article Using Wine for information on installing Windows applications.
There is also an article CSS HTML Validator installation with Wine which contains specific instructions for installing and configuring CSS HTML Validator.