Print a PDF via an iframe in Chrome/Firefox/IE

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I want to trigger the print of a PDF file which I load in and iframe.
After looking around, I came up with the following bit
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                <span>2020-12-19 13:21</span>
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<p>Try the following, might work in all browsers. ( I have tested with IE8 and chrome only )</p>

<pre><code>&lt;style type="text/css"&gt;
    @media print 
    {
        .dontprint{display:none} 
    }
&lt;/style&gt;
&lt;script type="text/javascript"&gt;
    function printIframePdf(){
        window.frames["printf"].focus();
        try {
            window.frames["printf"].print();
        }
        catch(e){
            window.print();
            console.log(e);
        }
    }
    function printObjectPdf() {
        try{            
            document.getElementById('idPdf').Print();
        }
        catch(e){
            printIframePdf();
            console.log(e);
        }
    }

    function idPdf_onreadystatechange() {
        if (idPdf.readyState === 4)
            setTimeout(printObjectPdf, 1000);
    }
&lt;/script&gt;
&lt;div class="dontprint" &gt;
    &lt;form&gt;&lt;input type="button" onClick="printObjectPdf()" class="btn" value="Print"/&gt;&lt;/form&gt;
&lt;/div&gt;

&lt;iframe id="printf" name="printf" src="http://pdfUrl.pdf" frameborder="0" width="440" height="580" style="width: 440px; height: 580px;display: none;"&gt;&lt;/iframe&gt;
&lt;object id="idPdf" onreadystatechange="idPdf_onreadystatechange()"
    width="440" height="580" style="width: 440px; height: 580px;" type="application/pdf"
    data="http://pdfUrl.pdf"&gt;
    &lt;embed src="http://pdfUrl.pdf" width="440" height="580" style="width: 440px; height: 580px;" type="application/pdf"&gt;
    &lt;/embed&gt;
    &lt;span&gt;PDF plugin is not available.&lt;/span&gt;
&lt;/object&gt;
</code></pre>
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