Webkit is the engine behind Safari and Google Chrome, but Chrome uses the Blink engine instead of Webkit. This means that Blink is capable of performing the tasks of Webkit. Microsoft Edge now also supports Webkit. Let's not forget that the Webkit engine was originally developed by Apple for the Safari browser.
The -webkit- code in CSS signifies that it will only work on browsers with an engine that supports Webkit, such as Chrome, Safari, and Microsoft Edge.
-webkit-border-radius: 25px 25px 0 0; This code specifically targets browsers with a Webkit-supported engine.
border-radius: 0 0 25px 25px; This code will function on any browser without limitation.