Magento 2 - When to use the parameter `@_prefix: 1` when calling mixin .lib-css()?

Question

I wonder when I need to use the parameter @_prefix: 1 with .lib-css()

I always use it with the css transform property

.lib-css(transform, scale(0.65), @_prefix: 1);

so that it generates this code:

-webkit-transform: scale(1);
-moz-transform: scale(1);
-ms-transform: scale(1);
transform: scale(1);

How can I easily figure out if I should use @_prefix: 1?

I think I only use it for new special properties but not for default ones like "padding".

Answer 1

There are some websites which can help to figure it out.

http://shouldiprefix.com/

Answer 2

I'm partial to checking https://autoprefixer.github.io/ as it can vary depending on how far back you want to support.