Syntax highlighting Markdown fenced code blocks in Vim

I’ve only just learned that Vim can syntax highlight Markdown fenced code blocks by their language with the addition of a setting in your .vimrc:

let g:markdown_fenced_languages = ['html', 'js=javascript', 'ruby']

The js=javascript syntax above means that a fenced code block with the language js will load the javascript Vim syntax file.

It’s worth noting that this can slow down opening a Markdown file so it sounds like it’s best not to stuff the list with every known language.