Add Open A Tag In A Split Window as a vim til

vim/open-a-tag-in-a-split-window.md

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+# Open A Tag In A Split Window
+
+Using tags and `ctrl-]` is a quick way to jump from the use of a keyword to
+the declaration or definition whether in the same file or another file.
+Sometimes what you really want is that tag definition opened up in a
+(horizontal) split window. That way you can see the definition without
+losing context. This can be accomplished with `ctrl-w ]`.
+
+As the Vim help file states:
+
+> Use identifier under cursor as a tag and jump to it in the new upper window.
+
+See `:h CTRL-W_]` for more details.
+
+h/t Dorian Karter