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CSS vendor prefixes

Before a CSS property or JavaScript API is standardized and becomes popular, each browser tries to support it differently by its own engine. We can give it a try by using a different syntax.

A property might need to be prefixed with an identifier indicating the corresponding browsers, for example:

PrefixBrowser(s)
-moz-Firefox
-ms-Internet Explorer and Microsoft Edge before it uses the Chromium engine
-o-The old versions of Opera before it uses the WebKit engine
-webkit-Google Chrome, Safari and newer versions of Opera and Edge

Let's take a look at a simple example. In the old days when the transition property is not standardized, we usually had to prefix it to make sure it works in popular browsers:

-webkit-transition: all 400ms ease;
-moz-transition: all 400ms ease;
-ms-transition: all 400ms ease;
-o-transition: all 400ms ease;
transition: all 400ms ease;

However, the transtion property is a standard property currently and supported by all modern browsers, we just simply remove all prefixes:

transition: all 400ms ease;

Do we need to track properties which have been standardized and work without being prefixed?

Fortunately, there are more tools to automate the process. They prefix a CSS property automatically based on the data covering which browsers (including versions) support that property. Autoprefixer is one of the most popular tools.

See also

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