I am using VisualStudioCode 1.20.1 Version. Emmet is inbuilt according to VSC website.But when i am trying on VSC IDE and using anchor tag and referring to class dropdown-toggle the class is not auto suggested or recognized by vsc.
In your vscode user setting, add
"emmet.includeLanguages": { "javascript": "html" }
That way you can use emmmet in your js files.