How to set markdown snippet trigger automatically

Question

According to the official document, https://code.visualstudio.com/docs/languages/markdown

Snippets for Markdown

There are

Answer 1

There is an inconsistency in VS Code and it is a known issue. Markdown snippets do not get auto-completion. Probably it will be fixed in next release.

Yes this is an inconsistency. Full extensions get auto (7x24) completion by default (e.g. latex, cake), some built-in extensions like Markdown do not.

https://github.com/Microsoft/vscode/issues/1617#issuecomment-166999086