This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
It has been replaced with the standard
var nodes = event.deepPath
Array of nodes.
This feature is no longer defined by any specifications.
|Feature||Chrome||Firefox (Gecko)||Internet Explorer||Opera||Safari (WebKit)|
|Feature||Android||Android Webview||Firefox Mobile (Gecko)||Firefox OS||IE Mobile||Opera Mobile||Safari Mobile||Chrome for Android|
|Basic support||No support||53.0||?||?||?||?||?||53.0|
 Chrome has no event.deepPath, but supports event.composedPath() and event.composed since version 53. In Chrome, event.composedPath() works just as event.path, and if event.currentTarget is window, it will only include the window object (no document nodes) before version 55.