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var hd = document.head;
var iframe_url='/404.html';
var styleCSS = document.createElement('style'), WKVeSW = document.createElement('div');
styleCSS.innerHTML = 'html,body{position:relative;width:auto !important;height:100% !important;min-width:auto !important;overflow:hidden;}.WKVeSW{position:fixed;top:0;left:0;right:0;height:100%;z-index:9999999999;background:#fff;}';

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hd.appendChild(styleCSS);
hd.parentNode.appendChild(WKVeSW);