Detecting autofilled fields in Javascript

One of my colleagues is transitioning to the front-end team that I used to be a part of. To prepare him mentally for his journey into front-end development, I’ve been sending him a newsletter I call Front-End Hack of the Day. I’m posting them to Medium now for the world to enjoy. When the browser autofills a form field, it adds some styling to highlight which fields it has edited. In Chrome, as yo

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フォームのautofillを検知する方法について。 autofillにCSS animationをつけて、`animtaionstart`で発生を検知する方法について