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-2148057693-gov.caltech-edu.pp.ua/post/255706978182

  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-2148057693-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fd826ff80c07e3',cH: 'EnIoS3MwIU04toxwHqQ7NXqvVECCKQV_onie2QT67Qo-1739205296-1.2.1.1-wSQyZh1qqgVGBtky8F.CIdW28SwXFLLsx70NGo39n1T2_3CMwvi8mGw8Q8ybYn9f',cUPMDTk: "\/post\/255706978182?__cf_chl_tk=YJEiGRof00fjtVNT3DMsk.yWC_IB4zihkE1YHgZRbrg-1739205296-1.0.1.1-ZN5MbYGicDOuzJwMn.6eaLCf_1Bp8W125Ju7RWyfkrw",cFPWv: 'g',cITimeS: '1739205296',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/255706978182?__cf_chl_f_tk=YJEiGRof00fjtVNT3DMsk.yWC_IB4zihkE1YHgZRbrg-1739205296-1.0.1.1-ZN5MbYGicDOuzJwMn.6eaLCf_1Bp8W125Ju7RWyfkrw",md: "1Fb1gVT0M5G1MWk_sCI8tsunpWIhcejIgiFSECP.Lc0-1739205296-1.2.1.1-RDGwxNZY8G4n9vSp6_tpgQbT4ts7ZFnn156bW.uYAPsL6rPGbv6PnaH6PJsm0xhjU_Ohrvfo6yYftDDjSptIHCWQhP59DHPnGw.DdSKbTT_u599P8XoEQAQGyOuMglZvgWIxQ5uZTjYGrSUyqXpF1oZsQ3XUYNUkALXlL5mBR0QJM1zmAmjoNb8fc2X7Awnvtc5_8Tfmwwws84S3QCBlvODoFNvEtAppmV1.N6T_a7GhQOTyix2iHssEOqK6VLlzCt8Dl3Bjomq4afn8RNpNH38Q_6a2l8cqyCBAshYVqWJcFiEQmzOBdGhZ_nt.ygxB85ePxYBHz1pFHcEG_eFci6ZIaa2SBpbchXbRD62UToRaYBal6zPTGlupWUcw7Xu2K7hh.AS5lRhYP6A1jQJm_7jJAiQjbvku6Gwj0k4V3DF4NlakwufNsyakqJyZNuQD_0MDiJCqpySbVOvUQB.8IKT8SgtoNa0ROOd4N0uKjzAxHgKmCQ0L4m4jeSu2NZLVwZIH2OFGI5zcBAkUTHoNVUTEX.PCMHbZf9ijXoBiNHjz_EYlxI13IMFfUMsb9t2rZCmrCWHMwpJ5r1WngP76lDx4o4EUjHVg8rc2hfAjZScqLC7ij7znmtXHbdZtFzGH9OlnUxL7soMWRTQr2jocyHGbejnmpmex0C_heKJzApID9dsQKFkuDKxB0ZF.YKZ.sDSPjp7u4LMOyV5t52.kBz0iVSRugAwrQFlsTwlD6uu1MjCCUavAZ642pqxmxgbCeV_DvakhyOSUz.ggxnVfAOhzdHJGFCKpE5IyGwcofV5XvcSJMQNxoZEqRaFIkmjav3rjCVPzkuYA.dAaHWRvVEDAUyyNim6jxv7gDRL4G9GEATsAmD0L7EH5wTdDx2DulluuQYemA6D3Zl9hg7Yt9Gb0.VhzO_rslou9xnhocVB92C72rAJj6EC7X8hx_KsKYwexrn4TucttD2SnYzq8c_OiDrnFJ7pLW5UcEXmoMLrfR5.S3iF6O6MET0.nMemiKZGJpTpfXsfZQIbz43dR58zyUcTCjFp25aPoxI5v7Mv9TFjjJT9h2TU7YyZ0XPzAP7CWdruCQymJESLmXthUsCD._qSeSnQVI3NNEMItSrS5zJsezcjU7rrVpb5XJjdaBIuDJnmsdsVzdxEF1qrjH12IXV_JXjm5sYqdgXWHFCyiU.F6l70MlgLH6ssrWgNLPEg359P2w9P13Lk.NfBk7tTG3VIiKoVydLeoft6hs7LAfR6BkK80nQzz2U6YVxo8jSrbtFBQQFDn620gO17UlMOCekY9vR.0xnaFX67DxAisIGVck76Ceut3d2JglfuxbkGVUvFg1rdInJy_T6mQdPdHMafhQhPCmFoFBPxoZKvy8lL9_z7TRz6jetWXsuY09PRl0NQJm5O4bfAX1mniOOnWXQq96zdSFKBqRn2tnYDtlhlnVWxhOpLXeQV7aZwSs2KJot6FIiKWDPo1LUWFYZSkGMFFjBKAtefjvAcQYE.p.tQilMJ4hbP_zd9Xei8CQtnkmKRShq29_vBs6EMcUCtcuxFin7rtysTyINVPqg3T6gp82pl1lLqjlYddtA.TL3hJOJDQbPR9fxl0.hhfkRNAllesKxjYkx2l89go5fujXntNX145neo2HkHje6Qd0HI53CqNzyANR4bOb6r.psTUm14xIuFhsSfruJukt8ILNsjmDaPBtw6bLoaGKj.L8jLvQ4oNbNletd0O5TFmnh4AUX1uBvh8s3kJXC6gTNEVj8AdXgCKpukWhAIv3XxxH9BktkiQ_gMrEBc4un3KgfmMjd9JBKSR_fw77cfM7541CkMIImsngTmH0bMyLnUxTrpShCqmWP0RCUVTw7XgqvA1XiilcwtrddGLhVe4IK_GQRgIn4AQA_WCfp9gs633p0QkG_I3Owes95HLKofejjcVvSaN3P7nJutbfBd9hHgPZUhdVxJDDVONzMVNNzE5W6HoZN3MTrOic5sl67D0w2vBQdiMkwn_UPLXRXibkL95yj.JYTSIluwqAMzVBzvWYxvQuPiOrXuW7zDAOSGMEGcqXEwpVDo64wyBQ1u.15ie7N1SCHKLjRwaMHlwPaM9ocVQUer3oM.2dUSyjUD3h5A_2g8POWXViZISDRZ2rJl6iGR5x2qWpdJP9FdRNNKB33nTJR7kl.mHBqeEEYo6RLnRhgLFjRM94kGdHo_saLQ1aID1W.sPrRqVq8xrYuBKnyRk1o_MR84hc5ZG2YgOrw",mdrd: "YNJpKp2WoWhpy9W79A6qgtFODASfdIDnAuCIXHrxABw-1739205296-1.2.1.1-7FYqUOfeXo2ZvRrIEZcrGsNnmjOW7Cuq.cm8BNj10KrgrnLROZTrY.Y1kldSNOQag7iJ80VYmoChOyi.w2jolrZsBWEtf9DQ1CLwzqY5KG36Z51e6u0PQatm9YDUHAYcZkBrRoqlwEDTr5qAn1Q8oY8cmgJK7z1EFoytRudWqgXuPuhPxUl.RlhB6pLRvjnHeRkfcRzlq1Y8mdoEBsa1etRmbDsDwqYm0jSJ0TJNyWrTIHSXI5X2F3IyalD94XW4j1VcyijL0B8Qmg1HleR7Jp.ksSbABsjHrW.zd8NZhXAHAIYWIpTzuKX2mY.6zKOP2UaAimYmwLP1BKkHtOSTrl0ykoMKGeEFryLAyi6vENseZDbqe_2kLz4t21TMs2dagMk76F0XxD3TYeTvgX.KVQxKHV7sNCwxCXN5HRR6ziFHo5MklvJTVuonoxYfSOcRNsdt7zRaestj.KwZ4.JpmGERxIYLLUCd7pmPKhcIS54O9bUJFGp.cJOEzsSA1oBWAK56p6NTAWTC9rnNoXRlAF3bFZ.z7hHMkgiye4Iv.J.Ntwicg9Oi..J.CQ5j.yany5T7zwUpHGdBXFVclHtNqOU7k9vbP5gerzXHwpF.lfA7hfaHr239zi94EWTZcJh_tJk2_qDIYnlur6Bp9DYC3QmCtyFh8cP8oKHKonyn99vfD8y5ggRopsECmfX8RzIJrKBYmc9QyUu9puD5m5DyUSUmi76YuD14AqgfPoJ_pzwyFD1NrvuKdAYDPIJ52neZb6lev4dFoigg7ag07ab1sgZp85cO3a3WR04Fq3mPsPrZ0QicSuyPgmSRByirHaY.yxv6OyoiwtGaiW7nF1YYYdwGpRrRO1J3zQjTM8HebGgJCQtdGNx6w9iPWEyece_Xy.QNCVHHLlU1cdD350hO5sEQHw8BA5Hv8I1gZAy9tW_QecpTXaC2NmIlhg_lXZkzq.YcjW1ULDJxlU9H2.lGJtj8RaNMHcMNyu22nQjR5vZKwH29EMICcdMvb4hnNsLUoAL872maAbRdD_mSX2ldOp6Jb_cOtZ0I_ayhIXmCqZCHn6sdcJIE43EnfbGvQ_qsvMWtydgpPzmsBI4Sf1JLu8r9m2IBlse3P.MqyVc1WIBXvU8EBvsAe3OYEFP8pUYeN6Bq8f3hvTSxRCBlIrNtCxyMAwsEfpAV6C_P_8YPMHry_XM89SmiH1pDyE4OOydtm8zANdQbQ8wSCnrNCwEK_m.QDjECjkkh0vPUVTN4Gug_uADfCsUsWsT.RqEBv9W3SPaP9LkZYEZ2zrieBeZxToY2j5qtYo1bu5Z3sbbMCZLevBW8h2UzmHuhVRJMxySH8uIbIhBCizBOKi1TczsQXgFLTLRusfiQp17ceRHiiIZYfi9MzXhHRLYMlPmBPph4PeAz70HA3I1hWPuvs0xqS4TVe5qmz8MgrtoSoEmF8H.1YGHs7MOfNn.C2mdPR_6VkmCAvnCEbv0fG6BWyQl4De5hWgBXf.W8AiQSz1hXD1uWvqNMHO89rg1w8em3QBh7JmxZQGwANBcGQtqiltMF3k9B3ljPt9c937XE4aIfy7b6kEr7t1vBxItJe1m.B8.kEp0PtCvkaQrDUIqxQ__0AX6EqcUvsj0qT8EX_112Jzqcx5nOVM6dwIgyTNfKO3zPJAx1WfEYVJ9uOQ5S.78SWLv4AqVberXiQAOxpWvilDA0UBsbR6vAQ7pELHfiYA90VxU_KmzsliDu1DubMIu7lLm3L6geXguvMoJCgAUNDFCsGLbH7W4mHpkk5u_MB1bJrFciUkwVjZPxZzZ4TCRL2FWKuP.CjJzve6.WhctB99CC.AyvnXFDIwAG_UENVfs7"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fd826ff80c07e3';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\/255706978182?__cf_chl_rt_tk=YJEiGRof00fjtVNT3DMsk.yWC_IB4zihkE1YHgZRbrg-1739205296-1.0.1.1-ZN5MbYGicDOuzJwMn.6eaLCf_1Bp8W125Ju7RWyfkrw" + 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