'how can I know if a web api is supported by WKWebView?

I am a web frontend developer and working on buildiing webview pages in hybrid app for the first time.

I was considering Page Visibility API and trying to find out if it is supported by webview browsers, like WKWebView and Android Webview, and couldn't find informations about WKWebView support.

I know there is a safari on iOS tab in caniuse.com, but I am not sure if it means WKWebView supports the same.

so I want to know

if safari on iOS supports something, does it mean WKWebView supports the same?
if not, where can I find informations about WKWebView support?

thank you in advance.

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'how can I know if a web api is supported by WKWebView?

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