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-4890563172-gov.caltech-edu.pp.ua/post/543570440389

  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,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzMiIgaGVpZ2h0PSIzMiIgZmlsbD0ibm9uZSI+PHBhdGggZmlsbD0iI0IyMEYwMyIgZD0iTTE2IDNhMTMgMTMgMCAxIDAgMTMgMTNBMTMuMDE1IDEzLjAxNSAwIDAgMCAxNiAzbTAgMjRhMTEgMTEgMCAxIDEgMTEtMTEgMTEuMDEgMTEuMDEgMCAwIDEtMTEgMTEiLz48cGF0aCBmaWxsPSIjQjIwRjAzIiBkPSJNMTcuMDM4IDE4LjYxNUgxNC44N0wxNC41NjMgOS41aDIuNzgzem0tMS4wODQgMS40MjdxLjY2IDAgMS4wNTcuMzg4LjQwNy4zODkuNDA3Ljk5NCAwIC41OTYtLjQwNy45ODQtLjM5Ny4zOS0xLjA1Ny4zODktLjY1IDAtMS4wNTYtLjM4OS0uMzk4LS4zODktLjM5OC0uOTg0IDAtLjU5Ny4zOTgtLjk4NS40MDYtLjM5NyAxLjA1Ni0uMzk3Ii8+PC9zdmc+);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-4890563172-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '9100376d18a005ae',cH: 'Mi1dwzhxoMEo0NRH.4PwL9koZ7N9zSUQuutUC_6BS5E-1739233681-1.2.1.1-qqK3trj0yMxw.2RgLwwyQL.2FcgBxi52U58u8O26f1Zu2qJ6tGDqAVE8cHpRswfu',cUPMDTk: "\/post\/543570440389?__cf_chl_tk=E_dEu2RGwNWZOaDsY5BfZ4EJkU4JvdkZ9OkRb85UQlU-1739233681-1.0.1.1-47Qj133CDc_AVDFJfsA_LOYu5dm0o5nqUTor5616cGo",cFPWv: 'g',cITimeS: '1739233681',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/543570440389?__cf_chl_f_tk=E_dEu2RGwNWZOaDsY5BfZ4EJkU4JvdkZ9OkRb85UQlU-1739233681-1.0.1.1-47Qj133CDc_AVDFJfsA_LOYu5dm0o5nqUTor5616cGo",md: "zdWLqNv.xrn0AUSsX2YERemSVcqTBQvwK444dZH2blM-1739233681-1.2.1.1-q4heD0rE3zV5dVSpqGhgYwujFbq2VOyhi7rp6Vcs6hzxm.UkUgc6EEsc81pq5BRUCzD_um93.HmyHwOtCcsJvuh90MyuH0MQaW0nJQsJKUkaQOGxyqpvr8nuV1ReqdrT_BDgkQDF7zU9h2uX._NarLKvOsh5u.Z2lQzmIiCt_fKijuS8_gXA0gFa3pkuWHbPaFxRHeYF778nHEuiOaVrm5Wv_yxD2srwVSkdyg708VBAEsrYSCE2zHtJ3V08PveucxvgXpsgbo3OkeXnnyYSQ6hL95F8_0uPdPN9JsbcqDpXyZWJArStZxEPeoXw8QnwyrtM7pikh.AYj5j6oq4bycRYmmyApPLkB_iCH0sdPlihSayegqRyPy6JwJyJg6kfqS6CHVnQudJKCKhivr_jLGzBlZpt2Ca98tJFPs7yfBzdNidh.M_gRRkzmBnuZrIZn2ldmbnFB5BwHO63vhwFyO_moGfqPGy4o9vteMahd8klbVj4abHDFzubbvm1hWfsFWK4n.0iUK8QfY1DHlNG6iA_7RyzLJd8WfptWBVIOpeoZJWO7q2vZiFF9lVwqZe3fq.MHCZhSpNviMDUGUgIbEALTAYoudHf9VLKatjADsDCTcv3iUm.MgvOPp_iJBH.gb73C.YMmUS8EUWwYblMuN_gubh3wMB1X54fiQnW3Ki_QXoviC2kSxOUoCMzz2F8rr1UNitUU0zSNKwgiOjVqm324IDIKrIYrUF4L1ORiihlC2W59.L037mIv74dy43AgDKIM0Usj2sOVDS2rwa.MGRdrFgM2.kndaou.KtIGcGkQ2N.xnvHY.fp7TGCLR59VmQnevwXPP3ISPHGXVBkykpletjN0rXkXNynUVgK3kl3XPS8BCkTbSiv8Ehlr_p6kXnfMilnrfYLOz3IwlgQc8c0.vMajWCDM6CWNu9kpwTDVi3akWFqSdLnMsWpjZnS1XrU6nWsBBWvckwGtPkYaurYjLcFLlse1dp52GF0VVC52.p8p3G9EC.WgTbdsC5klXSnZzdVB_0dsyZK_OkjBe4VXml3IIdxvvzb6WVqaY8Ad7CbxrtQz64Uzv48dGmleNpZMOq19VxTVXiR6GkLWi1FtmQmT36ibQzxdR3fYSsgJIUqUSswCL9wGt.DQA.4hpw6TsEdzU4Ypte.0Eg86eASSb.SkypJtL3TxNVEVB1ilK5RdtPo1pgF.FqjZS_pioKZvgoaqT5d4c6WJM_m5E64mJ.QVMzlB5LYdUQvLlrk4Jco9x1mtrz4iXXHcWCRzA6O_7JkpRDAvNmFCW6ymKSYFqQxZTauphlMFRww8P9uY4WqY18h_eMqi0fIKYo_H10KpcbbNVlt9f0po7u0WXI0aIwwPCuDf60i4VSQsS37JsTOVKl1Y18Bzc8kMfwuQQgkep5hn5qRYnAWFeH_53QErTq4v7gZN4U6eEAH0DSyof_UBoAJ8l1GIHf2kgApoyLgMnnxeLcdNifMe1kIGr4WhhelwWoe_re90Ztb354vys7Khrd4UIsNNlT6uFLI7V8UTzJ0hEtdAutZLkbH8YoUiW3ctyTfOZH.A9PMmBHlcWB1B0oqYNhNe7Rzr5zW.XO12PcQjIk4Xyfnion_LLd0rhexyM_UWEgS7YuM6cZtitUR9Y4XjjptDuZf9uUr1acUxZWHP5.EuPjjdA1fjtfMXRmmcN099hCykxK5h9cViA_2OPl1wzqNOjOPrPy.i1Im7pty5p.17hgmfJUevuEnffcvt63VLv6jn..aRZs0Q0TQIQe7HFNWxMVHbz.ONAe9pl5gF8srHWXsnQS1YtRfOU4EuAi6Y0Q7WO9OnWHnZpdBdJN4WMWUyNpzZnC6fsSVJ878JA61edLoiB5Nln8eusIqMYr8C9EJDL2r5lAwfrDIo8R4ovssyabKN6VCD63abuHukf5R_cR_jJfjCD88Sce1Y8YHsU24wnXb6GDl34S._ZVTfH82auplO.iIXOTfiVP6BXm2dlxDFvXZLkzwRL51mm1QByBP4d9phRRhhqe0qnK0LnwhAdFuvFRsLzb2zG6B6gOXkekZCAYRGRSCY2x449QseGmHILg0UbmKPm2Wnb.j7QYK07q0MPvCjXsaijqN7eI4hHqFNLVXzC9rfMWF9V8GqE7sJkkbByz_sCBnzWKmirgBeypD7LxgcImzfs8US8JsW3a7v2uhRRkaRH0jU1XcejwspQXZ52RLQFBAxdg_sidUxqLEftvhLhrLRV7E7wwSVfhyQQVunA",mdrd: "ObtyqjiWBzaB92IWasBTw7dEFVn.3Q3Uzs_qnHhLZuY-1739233681-1.2.1.1-W6Dq6JLO9rIsaB4Oglqzo88lQETUnAzyeNS9KdR1sFRhJo1H40eiBg9.sX4afNdgfnjKqgiXA_sCtRY6xXIMVLG3q8b.GiBX6NZ9EgeqTV0628ZHIIw_RD54rw_Jj.daQk0DSCtYvAPRsNrqa_93w9HlVWSU1ncMkRO18HS4K6ZvbdwqyshWII9rC9dxZnWTUVwuD1uf6FWNULKcrn9McA0VpLJrt2QfTRmDgBm8Co9mJiD5RRCP7CJzMVY7yK_iIxMJHzDu5UDWI7emDzdYh0W2e9gW0SpmtysDoXr.MATU_DLbMypVBpMsE3OT80G1o0O3n2blt9ltx73dcU401tVbRhxo_3DZm5c2wLRW7O6PAbbY.wVM0W5nu5BO.BMnBARCLdvtRf6PVzPbL7M46gdzVecE6OSOR198Nabd8V02jp9mjAPkPrkbN9r5_mNUd4vZwFbB0NsLU1a70.hfPJPH0rc8b_x040G2POFo7w7q_N0WEgSUIRmxvqOZuhcvlsI1_3N1uVHgAePueptU7ipwHkUPI70.waGmzyw42sU_XXMJxRUDNIJNz3NkprLubDqykihmh04NpZh2W0UyNiK5VhrRz82SHy2nb3EndBUTfmgwhjU5L8Jx40p1IXPM.CeVHIB4gX0XMMABl4TBCZV0GMz.8CdU.j_nsmhD9OScd._eot5x3nSbF4cfqA4DupY9IW1923x2oDgEO3rfQQFJl9mpy1HYo0kOd83LaNBZbCoE_AaNZXnlx5DXFbNkv66mThClsj58j_gRwAGADaqUizh8Ov0uTJ1XRXgj7IJ34Urd5YiUpaI5Z9GlmM0Ri4bdrIxnCXLdEmbvptHrVNEOBOhf6g_spdNgLz5YYNfpm9CpNKdC.9eAzuU4aCnEMvGE2a_tTYyIVyLQeVwhMOCsSCncRiV81eSuYGdQhcuCzf.SP2sTTp7OmZl_mayLvy74GY5h0A_fVvpEB4JXY_AqyZVNt.WjsD8nOz5dFKmeliPkd4QLsBdQm7scsAH.z9eA02Tbpo0GEyOYYHBKvzzjQJUJu1hA4U5bYMl.oGPkDOMRO08nuHrfqfrZODCzTK3bOZZWQLY_7vd4Q8fLSwEaF1eMd_O4.QFyANo8z3r6qSZshtk3j_.44nGKaSWxoDWZmE47RxzjKAlhX4i6SC2BcocNVeQL6vnUhwWdhdt0iFEMB26CCnmoXdgMfCyn_oWOqtXzF2uvtULlXBsUPU9H..c3JI1PeYPibrhuCpQI8xdiQ0fWJe5JfxCZT1nnwfcZA6sVypX8KCWKI3LR2hFR.rjyVbTR2KbBYqjCDVSSPBPUpUxoCzwq51RuT.JLAap4m5hBMBSKoCallycJcELzioDZ3cqQ798gBBRtCKvnLohduigfo4W7ViSLX_YUL.jx6dNvZZ16Wr0yXlv86hLTQIIJfGgXFMhM4NWlAZ4lW8gr3gKR6LR_1BYK0kZ1KJ7h1bNVLX4567BkN3hj4Xb9GGwXIRO5s3FUK1FwQTLPoKCb7HmzuBd_g8KwMSxuhhgqaNGYMGj_dytjudkG0FnwHnDX8vzI2qViCpQJTe4CwbdaD7kc1G0_puY9LlZW7rY0IbeZvfbrnwQ7L3ODzjkBqIcUsMON6q3RTlZ1W7QUL3Uwz.fPtwelbJ6JBjNGTeChbKJA0wJOqzutPaOFFDpnOVm.sPF59zaaeZEHZwwcNtIfaC18VCrsHCNWYHQ2yX9Icn3SRurBT.Suu9CP9Nyae11DrrEn5GQFk9M7hMpRdHytIAt7eWJ8VX2DR5uoFmmg55IEpoNSa.LGAQfS1jXxIvYJGpjOD.8fX03zKJY"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=9100376d18a005ae';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\/543570440389?__cf_chl_rt_tk=E_dEu2RGwNWZOaDsY5BfZ4EJkU4JvdkZ9OkRb85UQlU-1739233681-1.0.1.1-47Qj133CDc_AVDFJfsA_LOYu5dm0o5nqUTor5616cGo" + 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