This page lists supported CSS selectors, properties, @-rules, Media queries and values in alphabetical order. The "supported since" column indicates the Gecko version number in which support was introduced; versions prior to Gecko 1.0 are listed as 1.0. Gecko is the rendering engine used in Firefox and other applications; please see Gecko for more information about Firefox and Gecko version number
![Mozilla CSS support chart | MDN](https://cdn-ak-scissors.b.st-hatena.com/image/square/e51bd6dc33a667d35eb4146698a198e55ff92d6e/height=288;version=1;width=512/https%3A%2F%2Fdeveloper.mozilla.org%2Fstatic%2Fimg%2Fopengraph-logo.72382e605ce3.png)