The propertyName read-only property of TransitionEvent objects is a string containing the name of the CSS property associated with the transition.
The propertyName read-only property of TransitionEvent objects is a string containing the name of the CSS property associated with the transition.
A string.
| Specification | 
|---|
| CSS Transitions  # Events-TransitionEvent-propertyName  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
propertyName | 
2 | 12 | 4 | 10 | ≤12.1 | 6 | 4.4 | 18 | 4 | ≤12.1 | 6 | 1.0 | 
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    https://developer.mozilla.org/en-US/docs/Web/API/TransitionEvent/propertyName