How can I view a list of all of the features that can be checked for using `has()` in Vim?

Question

How can I view a list of all of the features that can be checked for using has() in Vim?
I recently came to know the has() function for testing the presence of "features" (see below).
:h features doesn't show a list of features to test for.
How can I see a list of all features that I can test for using has()?
if has('gui_running')
   set background=dark
   colorscheme codedark
else
"   set termguicolors
   set t_Co=256
   set background=dark
   colorscheme codedark
endif

filbranden · Answer

The documentation in :help has() has a pointer to the features it can check for:

The {feature} argument is a string, case is ignored.  See feature-list below.

If you then look at :help feature-list, you'll see it mentions the three kinds of features that can be tested using has():

There are three types of features:

Features that are only supported when they have been enabled when Vim was compiled +feature-list.
Features that are only supported when certain conditions have been met.
Beyond a certain version or at a certain version and including a specific patch. The "patch-7.4.248" feature means that the Vim version is 7.5 or later, or it is version 7.4 and patch 248 was included.

Note that has("gui_running") is the canonical example of a feature of kind 2. Other examples of kind 2 would be has("vim_starting"), has("ttyin") and has("ttyout").
That description of the three kinds of features is followed by a thorough list of features matching kinds 1 and 2. (I won't reproduce it here, you can find it from the linked documentation or, better yet, from the :help system in your copy of Vim or NeoVim.)
See also :help +feature-list, which covers compile-time options that become features (those of kind 1) in more detail, with links to what those features actually enable.

Biggybi · Answer

You can see a list of these features with :version.
This will show you which is available and which is not, as well as your Vim version, compilation method and other information.

How can I view a list of all of the features that can be checked for using `has()` in Vim?

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