Preview *.html files and *.md files with vim

Previw *.html files with vim

[OS]: Ubuntu

One command line to preview html files with vim:

:w | !firefox yourfile.html %

[OS]:MacOS

the command line will be:

:w | !open yourfile.html %

---

Preview *.md files with vim

using vim-plug to install markdowm-previw.nvim

the command line will be:

:w | MarkdownPreview