The @starting-style rule simplifies entry animations by allowing you to set starting values for CSS properties when an element first loads.
You can use @starting-style in two ways: nest it inside an element's ruleset or define it separately with a selector.
The main advantage of @starting-style is creating smooth entry transitions for elements that are initially hidden or transitioning from display: none to a visible state.
Examples of using @starting-style include fading in text on page load and animating popups and dialogs.