I broke up with neovim....vim is my best friend now

dot_vim/plugged/vimtex/test/test-syntax/test-markdown.tex

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+\documentclass{article}
+\usepackage[startNumber=false,footnotes,definitionLists,hashEnumerators,hybrid=true]{markdown}
+
+\begin{document}
+
+\begin{markdown}
+_markdown_ use `hybrid=true` can insert \LaTeX code **directly**.
+
+  $x^2$  $x_2$
+
+![](frog.jpg "One picture")
+
+the following `README` comes from [USTC Thesis](https://github.com/ustctug/ustcthesis)。
+\end{markdown}
+
+\markdownInput{README.md}
+
+\end{document}