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".

2 Answers 2


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



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

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