Apple style popup animation / easing?

I want to recreate the apple popup/alert's (iOS) animation and easing in js/css. Which easing function is it using? Is there any 开发者_JAVA技巧existing code that describes the animation?

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You can check out various easing functions (and how to implement them with CSS/SCSS/JavaScript) here https://easings.net/

You can also check out Lea Verou's cubic-bezier previewer at http://cubic-bezier.com/ to see what best suits your desired timing-function