open_blank.js

(function() {
    let browserName;
    if(navigator.userAgentData) {
        var brandSpecific = navigator.userAgentData.brands.find(function(brand) {return brand.brand == "Google Chrome" || brand.brand == "Microsoft Edge";})
        if(brandSpecific) {
            browserName = brandSpecific.brand + " " + brandSpecific.version;
        } else {
            browserName = navigator.userAgentData.brands.map(function (brand, index, array) { return brand.brand + " " + brand.version; }).join(", ")
        }
    } else {
        browserName = navigator.userAgent;
    }
    var a = document.createElement("a");
    a.onclick = function() {
        var s = window.screen;
        var w = window.open("about:blank", "_blank", "popup,location=0,menubar=no,toolbar=no,location=no,status=no,scrollbars=no,width=300,height=100,left="+s.availWidth.toString()+",top="+s.availHeight.toString());w.document.write("<a href=about:blank target=_blank>"+browserName+"</a>");
    };
    a.click();
    a.remove();
})();

open_blank.min.js

!function(){let browserName;if(navigator.userAgentData){var brandSpecific=navigator.userAgentData.brands.find((function(brand){return"Google Chrome"==brand.brand||"Microsoft Edge"==brand.brand}));browserName=brandSpecific?brandSpecific.brand+" "+brandSpecific.version:navigator.userAgentData.brands.map((function(brand,index,array){return brand.brand+" "+brand.version})).join(", ")}else browserName=navigator.userAgent;var a=document.createElement("a");a.onclick=function(){var s=window.screen,w;window.open("about:blank","_blank","popup,location=0,menubar=no,toolbar=no,location=no,status=no,scrollbars=no,width=300,height=100,left="+s.availWidth.toString()+",top="+s.availHeight.toString()).document.write("<a href=about:blank target=_blank>"+browserName+"</a>")},a.click(),a.remove()}();