How do you determine which formatter is being used for VS Code?

Question

If you have multiple extensions installed how do you determine which formatter is running on your document?

For instance I have a couple of HTML extensions that may

Answer 1

Starting with the 1.33 release (March 2019), attempting to format a file for which there are multiple formatters registered results in a popup like this:

Note that the notification is "silent" if formatting happened implicitly via "format on save" or "format on paste", meaning that you need to click the bell in the lower right for it to show up:

The Configure... menu then lists all the formatters available for the current language. One of them can be selected as a default formatter for Format Document and Format Selection:

Picking for instance "Prettier" here results in this being added to the global settings.json:

"[html]": {
    "editor.defaultFormatter": "esbenp.prettier-vscode"
}

There are also two new commands for formatting a file with a specific formatter, Format Document With... and Format Selection With.... This can be useful for formatting a specific file with a formatter that's not set as the default formatter. The former is also available from the context menu: