javascript - how to change font of text in confirm navigation popup? -

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I just want to change the font of a text that is written on this popup like text size like font - Size: 16px;

How is this possible? 

  & lt; Html & gt; & Lt; Top & gt; & Lt; Script & gt; Window.onbeforeunload = function (e) {Return 'you have not submitted the application form yet.'; }; & Lt; / Script & gt; & Lt; / Head & gt; & Lt; / Html & gt;


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