onLoadStart property
Event fired when the WebView starts to load an url
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Official Android API: https://developer.android.com/reference/android/webkit/WebViewClient#onPageStarted(android.webkit.WebView,%20java.lang.String,%20android.graphics.Bitmap)
Official iOS API: https://developer.apple.com/documentation/webkit/wknavigationdelegate/1455621-webview
Implementation
final void Function(InAppWebViewController controller, Uri? url)? onLoadStart;