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-5849023617-gov.caltech-edu.pp.ua/post/5849023617

  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-5849023617-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fd0aeaebb206bf',cH: '1OBCXjvw4yzR86jDJTn9sUFvhiICQeV9VJ2h.CeW53M-1739200401-1.2.1.1-YHWCW07Ns1IiaPbBE5KVACdZg45OMaVuoBctAOARGFvTaEwGgNx8_roG3C_GqfTB',cUPMDTk: "\/post\/5849023617?__cf_chl_tk=TYik4TvpfpAWnBi8EW94VrulpqrFr1yc1VQPwjkAR3w-1739200401-1.0.1.1-7JgpBe29isS5lFmpXpX0Ne1Hgyscwhi9JigByfXnusg",cFPWv: 'g',cITimeS: '1739200401',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/5849023617?__cf_chl_f_tk=TYik4TvpfpAWnBi8EW94VrulpqrFr1yc1VQPwjkAR3w-1739200401-1.0.1.1-7JgpBe29isS5lFmpXpX0Ne1Hgyscwhi9JigByfXnusg",md: "el9FUCDl.OA5QiCty53pdLLsPLPfAkE58FD174tz33w-1739200401-1.2.1.1-qkWKLqpEGB3macMqDZhFSNHyx_rjQizhQ3QSvTN9K5BsguNVffwGYNBDuUafM_HIxUsWdnOapiNRY9Z60kSzwP92Vhi._uZdP2xDnK.196ST7zJwTq1fGknYGzYuybQE197mZ2oMIIouaNVkGnUTFutw1BQPlkQh52I7jIPsAvWJfh1xMI6wNDYYuy_NOMod1mAWgdmPqPeJ6LC2YATPxKYodqTpWVCev4ErTXYF2I3YTP1wCnEF9f8kOTxY4.6rjWljoAzVpk3LadwcLTJn7kaDB7mxgiq114Vtjb3K2gm5D7E3MQSIGSaFRPo8u..LJd_dpp3FHiMSvCAEfJCk7eb4Gjy47s.JspOG4ZiR4w797qnvWlN_ZjIXZo.z1fIqS4SkYEyquiIbOmfdejFhXhVKHr_WolTmPk5i9W69Qg0g0F.btK20u04fBLOUFtk97mCYZyqyj7EGp8C8VCWRornF8xKOAOnYGkE.x4mSzdCQSQzWQ.TT35HFOTj7rkqqN99NrMOD8Q70RoeucaBHr1Zu5AkxpwBGeD4r7V1kvABCPxRLIXjtIwKIA1yAQto9gh884Y4K4edMiztAVlzVoHHxO_UehnqAf.fL4CKWVwzUIykDfhGSDJKBvbwyd6FK3Q8fIc3c3Vmj_Vhlk2u9bK8uvbFrJGzqDr9tgZq4vQ3q_QkNecLxMBrRzHOWqzfijPEqOuW1le4O46mSDbly92spt1DDkcrOKf.ChDMZPABO06ykcgrUl.Q5oFy4wwH0j.aMp0DwNoLPRr84UkeJu7mdo7XIIimq8MRh18CHYHvaVS6vbHlQ3IQJO7QcB8dVrZgd1ZQxwQ_cLKWbtn5_gSWFLy3oqglCOABQWszwLlAUibwQwS0crBzTLMyN7gTxu8rPEWSNcfNQaPfC1P5esUcZ_dNoyOTo2jaseE7Z5hmv7IzBmOzU5WWp8bwilrF.F7Kg6RzIhfYIHKU.XNNZBW__rpszZy2OPdHeeLxYdzhEpBr_ZSH5X7ma4OYfuu0S59l2YlVq_N4rH1OOnbAqX5po6MLMcu2V0JRq40Orf7Hi58bC93YxbF7Xndpv3R.5BA1Y61DqEdbOxxJYE83SJSU4DA30zIVQ423Rbpy8A.6XdBSC923d63XDmPDkO96AAonBpIP9guo4YXG__BYR6FD51hNiN7oJVAaNM9RiBMl2gUSP2JD5ZtPr3YuMrpKYF8d28veGY1DW8gA64nn8mq0Fc8aJVkwthvIa8XH_fWoND.t2gMmxCPSC3IceyLGcdBmL4oBvusmdCadSAan2zBfC5nm.xA6P9O7nhKGE1vitKlz.YWp.Hg_1meTcMKoBvvTo8miS_WS.W4JlhgKndV8HA0IyaEuMw8yq.nAvOZYMKzNAG3sOtxulgCcIex0_ppqN6Zlt.jvhiSe0g547lFib1QMSvtD.SLy.lQTu6qFXtCD9zvClzriq_f2zqNufV4m.elo0Nm_mDNCPPqn6UyrqvBMeJQ2efYgCq.4.xxxpdW4ejDnEXGTFRImjbppqXp8AYWPwJ6pp0iQ.R1NYZMSJmDx60j6_f_oGOCz2WQR.shaKXGMtUyKYwhVRYJuowFZqrcrRly6xU9giAyDtZdCYGP0xZ1BCaX238Z_zlo2_8fAAQ62AeKc1gK6Hn5YZsRdfgBuvcpdkt9lK9v6uLAWp43gcwbBP40KBotIyY.W9_ut1eklCG7vX5gDc0sCoL4iDI3m18BrJneh6Rr.pkUjA1SabPLJm6mnVP9j1nIsMnnFQA4L54_NO6bFWihYtos5X0XBT4JdSUEB5F.bqiTW90miw3bEUx7o.dBWJBaGsSg5hL1OOOR7Anfxd5NtTZUNVbgg9dBltK.KiGSKDuuK5hpmeqsqUGu1PUotLcyAh_b7vi9JAknc7MlzJP75AsG2mUMolPDRZFgavTyNKuCbB5WB5kQEL5838AGJe_gL3QcSSRUwt0aeMXKc7VUOwspFuIJpFIdHapGjEnJiJBpXseMpwSri3QXvtrWhdNLnNxIU2NCKinBD7d.1WlBt087.INP2pPk.9KXqYvyZXR5Ysvuocg4WyYFWzyWcHuL8V1ZS41sfcLtCPFoZvm9hKeNtqwSsJ8iNK5p6eEoRTLzdYZjFITKVSwUBk5NxkJsZ7QbDffrJtZAilpLbjsAzi.1xdilvuzFCBqU7dy04p9._zGkJNQ55rl97Vg9RdeJEj44J58wZxJT7MEOEWyaBCq.x.BphLoCTMhKhdiyS7Kw",mdrd: "DH9hLlLem7NHK_IrlTSOV2tITvtlKVWDFFwHXWPbkes-1739200401-1.2.1.1-3tbzQy8U02OExX3H.6FlqOBDlcrpwDuDbgbhjPoSb16lPxXu_1OWNH1nAPv6ZZqE88BQY7mbsh_5q7SY6OxayWG29AR5dzse9fikwx6HB1bhF91Q0llrD78aAhkxFFvKNSTKUbwcZoeB_YxVDJlvs2qR6zcvDeLMcJDOMPtyICf0k4Hnpk119NdiMOgiLjwmVc_TbwEYxC5rBjw7ZpvAUZAme4dPLzsaxCTYk4peFReQkI43t2aPtZZTWiTPHo9YTwJGrCFoqhbcvX0rl0u57mApA7QyZ_ncZECc.70IS71pQQobvHkz_ejDPpadt94kxFwELcPTWJuynqsUJVdJrrj5v8ufOMuwz3Ii81vX.kziRJEgkNeSFqmW2nHPBhM3FgYbSzWQsXnCSocxTFJdVA4gGoczVedDw7I9Io3KY8Wn2TTo7dVUoThCKhJJod3dJs9HyMqybsOyj7afry7JEpBBEb4302TYp4_rj5t.0rT_mjEQufsdMyrTMkjofC09.BoyhAjuQHbB_SZ0fwapIkRWCTZlGiA1UVlEiTwR8_C3H908RPGbTt.AJfkWINuln2LSmO_tp71gX8QXDZXgxRd6QiStZu.dmmLFouEn2pN7KHsoXXKbQwaRURXoMQ.IaCi9Dck3VfYYcW49G5E9Ou1vlbDmgjOO68eYSzwa9q_w2SApvNvkbyo5ttPnr49NOFTqrEHhLoZQwDMbGDg4sVUsGvzboE04xcXApPMGRjUl2wjxKm1EeyzBqI87nvuwfMYABTrYVhSSG6pBRDmKDg0zCcPFN__HVSnZvZEH3AqRONcT8BBu.vsv3CwFWebVTJl4o30URbqOF9o.Qh0NNvOx77kAQ3PIiNeQco5WNFUYCWq1jUrSRCYAcXFqm4MPVG6ZO.cOcQtO3xhsSyIxs8uRm6zGYVpCAoFl4ii4U_Q_5c3EtIbIb_li.eb6foCwlUrYhkRN8FIHii51MdnQvofWuuoVt6WmmY0csQuSDdqrA9_WbompOCBrVDhgb74zpZ4SPjuLwKZR.H9IAnPGOpZg5JXNIxrsSNsQjK0JREvBKtXF9RAocrnnQYUGU6yzfNTkEy6DHn0tXB9vnyy7_6bfVDtd4NN_IkFGG3qalI2SGDWaKqI4zxpCy7iUpKIaGHJRw2Vsxr130k4xfAS_gmEJ7qsatIdPZmMyEEsfwErpLpsf5BSfAKm4GMotMVbpzizZRELpuVFMEFSf7Z5pcV2mzoUuOWhP9GKIjxEkONSJ0J7ibyXsYg2hkP.AingEcAfOCpinmImaHTFiFXT4oCfEQwX8fN3q3pLCckcJ3Rw2BNghv1cf7lBbEG5wBeL6yfcijsPOVWJYVXGxzn.hVZDh3WA_WZu6ppP_WmjxZuNbeV11U5l4rgqmQWkcUciSX6R_vSRMsrtiWRYwdVYRco7KvqKpzpvGbFU4naszXntJmw8.7V_xnXNqMqLJU.hahG2NEv6w.E2Oz76YNNZDDCpP.H7vGD1WTpRqm14lsWnheCx1pPWCOnFXHw6.ULIL.WgIBBDH2sigKrZ0fHv0pMTi8zB01sj9Pe1PMEyL2dMMRY61GFqJrfsjfErzG.f7wen0fLG_hWL3p_pjkSBXCJlSME5Z5PD1dj9q6IVRj9dyHcG4bYpzlxVilGMWH5kjUYFjAAgUoQu_Ll2xjonoRJq9KAS4U7kmVNfHHL4mJTkX2WjEzTXCNtjPwMMHqSpi92jSnRH5ckUVhR0XjYtsOJl3kNNjfN03yiCXOFSVJKEYpmGM9_66zSkttYNz0_KyLxdy3dXEYtz3olX1bh5bJkwmFnRJcQEo.HueWZYqkdk"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fd0aeaebb206bf';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\/5849023617?__cf_chl_rt_tk=TYik4TvpfpAWnBi8EW94VrulpqrFr1yc1VQPwjkAR3w-1739200401-1.0.1.1-7JgpBe29isS5lFmpXpX0Ne1Hgyscwhi9JigByfXnusg" + 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