• A marker for experimental or non-standard CSS properties and JavaScript APIs, so that developers can experiment with new ideas while—in theory—preventing their experiments from being relied upon and then breaking code during the standardization process. Developers should wait to include unprefixed properties until browser behavior is standardized. For CSS, the major browsers use the prefixes -webkit- (Chrome, Safari, newer versions of Opera, almost all iOS browsers including Firefox for iOS; essentially, any WebKit-based browser), -moz- (Firefox), -o- (old pre-WebKit versions of Opera), and -ms- (Internet Explorer and Edge). These are similar for API prefixes. ← MDN Web Docs

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