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Browser vendors can add prefixes to experimental or nonstandard CSS properties.

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Typically the vendors use these prefixes:

• -webkit- (Chrome, newer versions of Opera.)
• -moz- (Firefox)
• -o- (Old versions of Opera)
• -ms- (Internet Explorer)

Example

* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    -ms-box-sizing: border-box;
    box-sizing: border-box;
}

Documentation / Reference

• https://developer.mozilla.org/en-US/docs/Glossary/Vendor_Prefix