This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.
The TransitionEvent.pseudoElement read-only property is a string, starting with '::', containing the name of the pseudo-element the animation runs on. If the transition doesn't run on a pseudo-element but on the element, an empty string: "".
A string.
| Specification |
|---|
| CSS Transitions> # Events-TransitionEvent-pseudoElement> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
pseudoElement |
2 | 79 | 23 | 15 | 6 | 18 | 23 | 14 | 6 | 1.0 | 4.4 | 6 |
transition, transition-delay, transition-duration, transition-property, transition-timing-function.
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https://developer.mozilla.org/en-US/docs/Web/API/TransitionEvent/pseudoElement