Minimize the CSS vendor prefixes generated to only cater to browsers that you care about by entering a valid BrowserList value. For example, the default value of "> 1%, last 2 versions" generates the appropriate CSS vendor prefixes to target browsers with either a greater than 1% usage around the globe, OR (in addition to) the last 2 versions of all major browsers.
Multiple criteria are combined as a boolean OR. Here are some valid filter queries:
last 2 versions: the last 2 versions for each major
browser.last 2 Chrome versions: the last 2 versions of Chrome
browser.> 5%: versions selected by global usage statistics.> 5% in US: uses USA usage statistics. It accepts
two-letter country code.> 5% in my stats.ie 6-8: selects an inclusive range of versions.Firefox > 20: versions of Firefox newer than 20.Firefox >= 20: versions of Firefox newer than or equal to
20.Firefox < 20: versions of Firefox less than 20.Firefox <= 20: versions of Firefox less than or equal to
20.Firefox ESR: the latest [Firefox ESR] version.iOS 7: the iOS browser version 7 directly.not ie <= 8: exclude browsers selected before by previous
queries. You can add not to any query.
Major Browser Keyword:
Chrome for Google Chrome.Firefox or ff for Mozilla Firefox.Explorer or ie for Internet Explorer.Edge for Microsoft Edge.iOS or ios_saf for iOS Safari.Opera for Opera.Safari for desktop Safari.ExplorerMobile or ie_mob for Internet Explorer
Mobile.
For more info, see the Browserlist page.