Function loadIframe

DownloadAllContent/DownloadAllContent.user.js:1252–1258

                    let iframe = getIframe(), inited = false, failedTimes = 0;
                    let loadtimeout;
                    let loadIframe = src => {
                        iframe.src = src;
                        clearTimeout(loadtimeout);
                        loadtimeout = setTimeout(() => {
                            iframe.src = src;
                        }, 20000);
                    };
                    iframe.sandbox = iframeSandbox || "allow-same-origin allow-scripts allow-popups allow-forms";
                    iframe.addEventListener('load', e => {
                        if (e.data != 'pagetual-iframe:DOMLoaded' && e.type != 'load') return;