WKDOMNodeSnapshot
A WKDOMNodeSnapshot object contains a snapshot of a DOM node
Declaration
class WKDOMNodeSnapshotOverview
There are various ways that JavaScript executing inside web content results in some return value being passed up to the WebKit application. Examples include calls to [WKWebView evaluateJavaScript:...], [WKWebView callAsyncJavaScript:...], and the body of a WKScriptMessage.
When application JavaScript returns a JavaScript value, the default behavior is to try to convert it to a foundational type. e.g. a JavaScript Number becomes an NSNumber, or a JavaScript array becomes an NSArray, etc.
If the JavaScript calls window.webkit.createNodeSnapshot(...) then WebKit will create a snapshot representation of that node as the return value.
The node is an opaque object as far as the application is concerned, but it can be used as an argument to future JavaScript programs via [WKWebView callAsyncJavaScript:...]
Unlike WKJSHandle - which keeps an actual JavaScript object alive in its originating context - a WKDOMNodeSnapshot is not attached to a live JavaScript object, and it can be used as an argument to a JavaScript program running in any context. e.g. In a different frame, or after a navigation.