It looks like this is a web page, not a feed. I looked for a feed associated with this page, but couldn't find one. Please enter the address of your feed to validate.

Source: https://mit-edu-9760123584-gov.caltech-edu.pp.ua/post/045084112594

  1. <!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="390"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "mit-edu-9760123584-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '9100df255a19c5a6',cH: 'cpq4W2v41g4SqrbFbZ6A8nij_hP21ET6jAFJioRY8HU-1739240551-1.2.1.1-vSBAW5WWdrzKeyaLunYYMJMF817zvRxUwAvSMIt.kMo3dB_Bk9qLLffVrpRq9XQe',cUPMDTk: "\/post\/045084112594?__cf_chl_tk=fgMYjh0cVpNza1yYz_TrrMSe1ApFJgYj_4w_adn_QIg-1739240551-1.0.1.1-hJJoOpJLwpIyIU4xKQede9.x_riVFMbjfXZidcHUH_4",cFPWv: 'g',cITimeS: '1739240551',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/045084112594?__cf_chl_f_tk=fgMYjh0cVpNza1yYz_TrrMSe1ApFJgYj_4w_adn_QIg-1739240551-1.0.1.1-hJJoOpJLwpIyIU4xKQede9.x_riVFMbjfXZidcHUH_4",md: "VUOkBsxB0tKJmbcXkUT09hhUmP36HCEDAtBurvqa0Mk-1739240551-1.2.1.1-QothW.dLS04V6r_QJlXdyiCgUAyzpIYlj9waCNe2VJr_DL_h41duxFsYLvnPolafkZ9oKvdL1yBpp63z6ucTFeM0HAuTOjyAtkb58a6joI24m6I7szDLf.vbc5luZwBYNXPy6sla42N9f8u5p9eX_tXnBlFEytfhXZ9miEuaCL3hJ2cJ_.d9xpzSoTybIiOEOqmrGkL2HSoF3fb3aJbE9ixqAZziRBRAasUB11VYj.H4gjR9vgSg256_9VqOfVxROqzLjnnqsRrPVLVz2ju99onK4en8.dBlQ4lYJlTUwLYZDmuWy7TmGvdWpnw7fGqElxCF20ngcFc2VVCrEVtIa4KQ6.a5MSK.PPFSit1vcMZlxe8HYlo1tqoU0hQaCGnNtT3Ju2qEyQQQQs6R_485.57h6O6V3Zu7GXT8._tYvpd7W.xo0APSTCBbt0yT1gfBbkT.DJhIrg7XyaC5vfCboORFJLJT9Gk.GR9Kf0EBvcUHuJr8Ssdksa9dQYbnRdXdI0EB2Pm_XWkwy2CjAMB4Godojp55NMHbtqcY_DCm4K7UhWgQ9Pdr74H6H9s091tL_Ou2gZli1jDAVRUoBDi48DlEz.ape5hVOgMiwQ.QauvP6T28xz.B7ocf.MteotoUJs1wqpTSAcHrPf_lcGP.KWvtzgAob9v4BBwr_4igRQHHnqS_o8mqbVdP.uSuVooyC9LRQFXb3Jm94C3IWDleIVXSiQwMX_LmcNqKf94GvTn1aT6N5GBB90hyJK.yowEJLW90OPGeukgh4WZOybfP.z.nEfdPr3PxmwuyzS2pwqWu2Pfdf8wsVFGhxHVLIn09sZFF._SpzVlFvqNDgRfTnE4x.k9rZKYbKqxFUzI5J0uNN4tJipmfsME_nH5uHiUp63kJIY9clvp8bLxtksXHt8._HE3Y.nrcRZkKKV2uYmmGdnO.gD3WHYtTysvAe7Up2F3hzpuT6TrY3xYCHtd9mXHb02y4XzD7IDKZiiqP890EQBspwR8qSQBgAfuPAeRhd6j9ChcpaDSfu9w_EOtEGP_KfBwEhno6fotQ3XX7dypAwlFHXzJVME8QuxrzSzEfRCHSjY1KaB6SD86FGMJYhwG9GJjHnbyNjAAzhqVe3GtgeOI_Kucs0q6FvP_Y78xSwgtWsHcTL2pc99peN.k9OMP1KnwSIIuGNZJFioNZ04a..Cqk5SFh4xzTHwqDRu6.Tb7TFj6bqWLRJ.idcoaxtp_yWzHuWBN.6ZT2LDt0Mcw4zM4pOV4K9AxaaFBcodPg0id3SGnFdyuhgGF1T66Ui2WF3pWjXXXrwk3tuApi8coP5b.IhEtiMRsFxn3AMGzUInYe.kYCdjyFIghjLmsMV4gQ3dcwCHxlwSQ9bC.iVSEGjl2jJBeBKiAlTdLhjwF3L.KNN53Hnv6S0Ex791t2dntmoGMcYuYk_yTpUnUJHiaKmRttX8DZzDoNdqQ0JfD3ajRlyezzuqiqtCVN9GqNvh6.F.cw3qi..vKmFiqJDbNaMm1ahbtiJAYAATsWmOg2ewjvDSvH7gPnc_nTYuUDhwybX56qhLOXb2jh.STXK1Tvqyy_APw7rNJ86rOoRTcwwp85QIZSV.hpn4eW9bda7fnqNM3wCR4B6j2fGWhPXxNl2VEHCC59bHGcp7EjygiOrAy5jS9qZ7pTBDAmQNT2nUHxPlFYrnOUO076T7BzIPXLz7lo0v8Imvuu_0u1C5BKOrr.U9dnAcKEIOMfBKRuCXLYVE9MnhLa.dx97jHoGNYpBIqcf4tp1_ZbdNZGmzei8jSI47ansZ5pqDoeijujbS.bPb7KMeWxUMQxt0xCrcSP0TmVpmy24NnzgWMOyGK07zfTQY69AXCM5oTIzEcwxg2h1xSPcjwEY5i1lBoCMc8PyIKBreC3qNpvuMzJ7csquAsVwixRSq1M5xi2ZYMlyARIjImJQKKHZPHOSaWsYu.v_EZ.YgETUU_wXWpKs0C70YuYQ2mYejmdcAnM5TnXfnHZotEiIsEBLBt3WP8xegIbJZPBk7sklldIbikCgKaBTFN5w6gxEMJVSw991t8GuYvnmGqbeJ2DmZNy9ca8_X1xyLIus6nn8sVAETWTyh2OjMLxIwSPigZ5Y0SesLQkpVKPua6.mTQj74LtPUcxc8Uq8wy3gHHrDzw3GAVGnN3vNxI5BR1Fdu9wFimOJcUAi9fJKOy7IbtMO0JmRvG2QBhIvNzkmgIfypq4Ce6v2_6JZQCd.f6NhT02JoynWXXC_Q",mdrd: "oDST4rug5fxmUARhq5SAOPrJKt85w7k4XcXdF8SrA6k-1739240551-1.2.1.1-sItswmIzS2MTgVEyLQBxEcRttyECGsTeFsH2GK7x3NQW1miCTVKuRJi3CAlIOeKCzzF3DcFq_fEHzCWvpuKE_h0qzD5o21kFCSKFtgNR4ZDaxPcL3aSDUIU3.IGB2yzUqFO74KL1hGMrN2AI_0p3XSJCJHAasOYKrL3U7LHfmMUav6q_usbKjD9Bk7Ax18hNhoJMP7r7XUwYDt3MRZDnYyZYsGQsy.WNCqFxHOSjmzZLBiMKAaiAo3qD1NAGZ4NafJmCtaM09ajAYdi.va7c25tAVclQssMKrl3qnNDCDtCK.upXzfwGRidjsmDXlhUCPUhEwpUyD4grS6RU3w8YgePeDlttlnnnGWCxjzg5tb7Dqh8qZ5pL4CMhohCK9FlZTHrKiXgvT5rvE48vcUz6XWUB5PqmYqoZvNgsBS15l0lrXw4Eqy8xLFPIGic9_V0K5NKqbZ71kIKndtYxpKfTHspFYVE.OvJ9DsUuJyALc0uz44X3uqn9DpNh3.BP2YNw9tvgDmf.rCYSs3wj4u0H_2HLj3ifI0izCbwUxXj1KeZwNeA0BqotSsePcffeXFTVg8zaXurK3DEC07RnDyjMvcMfUmLTeSOblXsDDtPWp.Q0UfK8F8c.or5a0x129O4EYMhBbCyuLbmmjlAIR25jDvmcm3ucB5HDLSkz0oVUqEbldT6dK_LtNS9iRtgoItgc_S2oV77XxoL.dTk.sUbr5E6BjCw0uBJcxUz931OSXSJNFos3_A5TeKXJBX9E5._IU1J.f46jMWU0.PuiGVwq.BqYRiGYmrJ.wXpHAyZ4JPnPVvBp.dPAeUUirlEhB7b98RGDGrw8otdgq.ibA_REvUmfNPWC0KAbfh0BJIKfmcv3oeQGInBQRpB8fqHGXbjj0QA1_68ca45w1NZApeEA0.3QSRu79SZHBRL6c6KlNWQVmt6p.0k2l2gBaHwVEBwJIZASwMhTfrV4qoADYZ5zOAa6xk7neFC4iZwvweIp25lD7yigj164WVEL.CFJRku3kpSBKRutWtf5WEDBUuaI5TmnkgX4TQIAF7ZUDLYPWtvYUS7jdnoHdhiuBkCfLWazUj4HBu3nWemI2t._NAmJMaV6OORW8paemhRUETgQO4okOT3WuZqJNzCTQ01BEhkC.jWpMDsjawiv0lSlYhabAgNUw77bsaSEOoipdiBWQk9BS2vJTHLBoOdL8pgerRQYs_EoIqQN7n4PGVYnxemuT_x64thKv2WstRyXXD6NAxN0E0sUvTKf.505PbHuZNSCItHSdUJLXk1DC3KDe5E7CmzBRlB_avapMrURAIYT3v3vT8TzGOTskuwmcTML5U0JGUQmIl9S3QVD1ChhHQZySC0xzoYxaqdlLEuDDNuMRHNURf5fRAzN1lLgDsOQJqjPkuz6UoBvOXa5hBdGZ0GThvMAvXhmNHTUE3eJtVaUlbSCRx2EH0f_Or9NCJ0Nrv4FKzsBNLJC1bCIx.0031tSXDzJ5dya4MAd0b4.QEarfRCZhJCVh_Ur2plhgJAgjtlbBSZTK_C2fRFqFXhtncEMKsJFXja5GWKBh865F8vrmySKtmUl5eNjsjlD6_7f4.sch7xxLom1Q3lMVZ8LBXl9rwhzUD0PeAQPaHi3UJsW8xGyfu3NYXOddPTIptD8ifAdJgjd.sj6iG0ULy4pDLfY0Px38CWoWGoEpmSzinnd5hAN2UCtsYOSYbdXHcogR.9G4zWSABBY0CclAX0XWH2CYeub09IqmFY2NhiWDnAfheapeBc1doL7JhmHlJ70FFJcYP3FS85NjvCMszVj0sEUGsITnvPeFcb9JwHpR45km2fDxlfLjPPkRR5SSXtF9hws"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=9100df255a19c5a6';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/post\/045084112594?__cf_chl_rt_tk=fgMYjh0cVpNza1yYz_TrrMSe1ApFJgYj_4w_adn_QIg-1739240551-1.0.1.1-hJJoOpJLwpIyIU4xKQede9.x_riVFMbjfXZidcHUH_4" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>
Copyright © 2002-9 Sam Ruby, Mark Pilgrim, Joseph Walton, and Phil Ringnalda