/* Email Icon for Contact Us Page */
function sws_email_icon()
{$output = '<img width = "40" height="40" shortcut icon" src="data:image/png;base64,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" class="sws-icon" alt="contact" title="contact">';
return $output;}
add_shortcode('sws-email','sws_email_icon');
Example of shortcode 