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The Window and Document objects are core Javascript features and can be expected in all circumstances, but which methods are supported?

April 26, 2017circumstances core DOCUMENT features Javascript methods objects supported window

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The Window and Document objects are core Javascript features and can be expected in all circumstances, but which methods are supported?

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var fbtext = “Feedback text”; var fbwin; if((window.focus)&& (document.open)&& (document.write)&& (document.close)){ // All necessary methods exist fbwin = window.open(”, ‘Feedback’, ‘width=410, height=200, menubar=no, status=no, toolbar=no, resizable=no’); fbwin.document.open(); fbwin.document.write(fbtext); fbwin.document.close(); fbwin.focus(); } else{ // Some critical methods don’t exist, // use a standard alert instead alert(fbtext); }