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-1087925634-gov.caltech-edu.pp.ua/post/808778168713

  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-1087925634-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '91104aed8c9dd6f7',cH: 'XZS4.6dmCbvSYXS6YVulXWKvoaUpgW2s.QYD1F5JQJc-1739402252-1.2.1.1-kB5ccoSP302T7gQULY0TX3.VvU.OkvESh8A0rULME.QyA_GfhsI5CI.jSi1NkINH',cUPMDTk: "\/post\/808778168713?__cf_chl_tk=pp2WFQg4KohUTaNPw2UW_e7H.87P0iquf9rRX2SQDWM-1739402252-1.0.1.1-8K5uzC.8sDQV1Z4YNzJKFp2y5jE212E90EtqTAlbu1s",cFPWv: 'b',cITimeS: '1739402252',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/808778168713?__cf_chl_f_tk=pp2WFQg4KohUTaNPw2UW_e7H.87P0iquf9rRX2SQDWM-1739402252-1.0.1.1-8K5uzC.8sDQV1Z4YNzJKFp2y5jE212E90EtqTAlbu1s",md: "IsNOlaqkQI4vIdI17MBbwLdj_UY.msq5uD4L0MHlXvM-1739402252-1.2.1.1-tv_KhuUaR5d8rpm4tV2nMfiww7cphCnB3OqM_V05G2HnGOiQOuKK1lEUiZKLwy98UQ1enU3LmC_4Ujii_N4S9ILxadgg9kVcgtYIGuCc0spiUzQzrx3ghf7LvZ_wbg3WQLOXYJnd2fRgnizic7jlTrwlgHxD.nr6azThHUYytkiLDZzo8UCGXLb8cVVCjxp.O0XUNXqToLvd6WxIavyZw4l.dq6P4jl3H4hx_fsJpBc8E6jIEQZUoJSpEK8UdydzMrXTq40BTmT0yVdWx6beEcdeQayeZfxOfgqhNEHqVsprulH9QwY70CHVDUCKiiivY8U5edTpaVgLvYomtDGO4OYglJZSj9pi3UQAdlgC2pMAov764VoH_yk_i5cAqpsXgBuatszW8Bcnqbu03de3J8sOGf4PxDa.CRYvvS54Fme8898j7FgxDBn3Mm1iqONYDFrVj7YszEDRosMHjfQX36J0FGMrff7rL4SktdRjaEAae_qTqTjWlWJDBor.w0yeXRlCj1oUhKp2T7KlIcw_txtQbaM00m6o2tMWd0lYDk3iW8tjXE_SRl94rAiLVQF.Gm42HV2p72TPXhHTSRdi8ZAvj.04yRR4HORxxkofR4OJWmybMiOwtxZ7iNMXnsoH1IMGxCYU1sOoCKJlpMihBA5Hy4GRM6.hWLPxTPny1tJuxgg8OpgUrChtLhu94iPqCzI_Euopvy3HL5PZgXVLIIi3L21e2anycSvxC7iy9KHYpG3sInm58E.XWy_ctY0V5pzr0Di6FXxVzEybKBcl19VNfljL2Jmvh5HofAEpn37Io5EdkTj9._OFFxiLI33wFMEHv.U5Kma.u7TVtbFvggOusy1w2TJIW485dEw1I8U3fpbEX9JWn25jqSD6MVNo4y35pRuiG1qb2QOReVO_Cyfz3PuszOJV3rfow5l7MEvaI_a7XgLvmm82PAcvdBteaKbz_fHaYdyJVcbT_Qy0k8totrfTOMaa_O2wzpiAJ49aYrdcZ4AKd5D6bNrdZ34OFGYK7caJqT506g.tlab_6uVUTFl5blK2LVi3Vr.igx5Ybfb87cRt7I_0hUoTLoLy1A1RB1s8PRVw.EtR0_nx1VTm90N5CzCKYwjIa16mT4uaZ5fjLY5TW6FGpwetU.8LJeOczpujRtCB2V20QwkMJWJTnmX8aJQuaA5K4.18htAY4CP0BomuVrjpHCoytXRWbGrGbkUrajS1MYuwjwk4qQp51OQmRES3e_r3UF3t5KtrERMtjtAx.Yw57XkJ3SjL6.8Tc.t1Tj6YRHCRK_tF9qjp9XA1bCHY0YfF7aHMxxQi4s9_IDt8q.SXOC9qQmCY_mOoVVlZ8r1wmdPVl.NesdCPlKC1RlgwiSwULngaQLJLd1XKEaOQsMZQTcLszn76UPHvp.ydfj54paVfLHUedbZmT5zy.ojip.SKhKuC3mJ_UyCl7.EowG3KkIHoTxroX0dnUXx.nOMOsHYTKZs5ZRh11bJ87h8yZXL4InhTsmiTPUNHTUvD7UVqXQq.BdUrw99TnkMZOTBjY.FOL.6buDn1tLnbfyYNR6C3fRN3pDC0Y8Dav7Jl5WfNJ9fUVlMAe75W5S.QKSRK6.9pqDaXoQxFPWEP6oCjITKwlA174ZHkZUk9AAmSnqQWsmT5BxcDKV7d6hn9mlcSrYvEANvOmwiN4XWdInMgotJszSZlAxMXXUhmN6FAdyYAPFXGaJzQjMG_3SLFaKrispc4OPZ.W4KKr0ZkFdfD1O8.48RhwYF7s7FlFGk6SV2pElRBtBwP0r8peXIAbsWsCLkGhoBH60EySfDFDN3rZAbOPObBGxMZ10ew0MK9EDoRrQv9.RfQEZCnNbMImJJka61mlneu1nrQ1W9rgddYWuVdd83msJg9zCgBt7XFFO9yWppMvhw5WnZQFBBEr2Cw1rz9UQ_qK0Wnt2krkH7p.aEFqQJtf7zw4gik6Z5OylCEpAtaxDia.bO.KOkjGQd9cWuSD0u.5drQWjlfwx7Qg6x1VW0YzLSEA9AaAgGMAOI0RhIU3MYl6e_MGCJvo.yu0Y2RF.uh6Dc3jxDRuAJlo7G.HfFe2RRiqfP8P9jSy2zkb.sEHZ2lthGVE3r_p3LFH4gY3uJWIfZuWs.Qimjc_YM_yfxkpCa6cM1p7ybAUMsMynp8r43hMA2AQvMn1NLklcrBE5vKEFC_ZvfoKpvMNruVcZyJywCwUp6pHAIhLJN3B5TTS95jkL8DkLgWQKcSzZ0X80xKbA",mdrd: "W9GbBz7Skv.lF42xZBbEP2j.5vfl2g8g2TSZNJT2h.s-1739402252-1.2.1.1-Ml0j.djXIOxzoVAYcGy_FO8KFAstAi5OrbyGQHXzk3Wk.q2fhjF_XCS7eIKXRLvCAyBcRb3vHCI1KHRJ45CnqK6hh_6eRRIQ3HcV9Ra4_huHddCPenTli.YafHKGb22nDPISLL7xsWgNkiVquN3vGlvJgk4xqr6sbn1DBLe89qPkd6_hP6rdS.OQXv8f7kMEvUUIyk573LUbmgPkzjjK7V4QR2jAjbm7PkCNCRcZjrcO7ihJb6tQ0RuZK4hark03OISbPqYWHvlVLCPmYoFP7CN28ASPPG.GSs4XSKNUI0L5KjHvvTqvTAHZP18elV4nOBq_xdrz68G.EsAMTDpB0RgIH0djkdyTCXGzoZCqDH5BluJb.sexRn_Ox1uDXW9UQ0jg.30Kb9qlWMmdu1euu7TUTkdEaIjhdvURWrN9jkSpOZk.WBxMlOvhLRh5Y0aG5Go_soFiBUYj9X.I41DPD7kJZvDdGuWFJROUSukdpoXEdUlRPEXJpnnpvQw4F6wWjyItu4yfW3CGrJdNw1h.7ic2RgjKiFWP04VCL3d3EHse5QSjNRG4tDwoM4n75dQBXTV_G6wyP9rg1AsQ9fyTNo4Zc8AYmnhV8IeCRo51uvAmovH1pLnJzL7CEDGytoehMq107b_LXGt2JeJwWxht.Pe26vUPs_LLaQjHwQWlDSOa6VRuGaJQtDzLcU98_ZxQoJKv72BV2N.quUObZODIT4_Uw7t24swRw3smMrX6Pik4nPWotRnX_SAS8buKXgCmK_rWBFRK92495xBeabRa_ARnQecndMy4_xRnJzqL4FMGK.b1CcIWXxzRVtzxsAFK85XNM24fxxYCkVsZBIu_44U9okKZOLf366xyUKUxFTKCWIu4Ksyp09Pf_3p4xDqWJvXIxPcy1RQcN.Z.KrzoWvPAIpr13wCuIC6nu7REGzNYqCpTVmVqxxjU52mNygIwX38Pxvi1mRPGNzGPwKOZod0qoPWMOHqOteF62KoGBSq3U6kt6P1OBGo9T340apBiO71WCApgACXjuud9AXLNV6pOE0AdHj1kZsTrXZZw3nalzXNaYFGwnPxC89rouqxf5Z0PocaTTv.LtavJgHY2ZoWm3RLam23DWyoSXHsc6hewx818qUzgHKNhwU3JNRezXhGnJubZHV56RJjBpVV53zAR55vBMSZuM7FkiVJQjffgFJjxnQLGr2HJvYGVTB8XI0_1G1nBYnG4QsnL8O9IHgN_dgziqf_lneGoe2rziQOeXMM.gbqimsxRBReEHw7nmvc.o0.waiNfzFnBBBV0Ih1u8LWHC0mebQWvQz_faaDpWhAJd_73BXvOWxqlAZYMON1Uu0sRspUo7wM8mt7vaKsG7AWDbZfYC1IKPJ8Z0_TmFNGqxVK1yIPWrH6PrIgSFbeTL0bMldiLcE0z0E_PcrSq2ulCvMCPkkckC.P2xz.TZP4dSklOxNZrQYhNHTdRBXuiAeD0LBLGmIxEMmE4W0nZ.sLSCe.zHWfz5G8TYz7N7DSZ7.TdPT4ClXHvepVNddnwrzVC1T6kSGuWmt8kPZr.FfMcIrej9A4TeOgjKYm0eytU_b2usxLyE.wRjXMU245mJ6M7A3d3Awkgl886kE1TCs1lwu.jqs95LBvS2ALZ7Gt02p8LbJYX7_uNPTbuVW_VMsBeyDc85loQHWycI5wfcob1m6S.beE_sH2riA2bE8Zr.Awy9kcdoKJQmmqss7Knx7RtF1pQk8EmVmYpCaAXSjACCKJ9aQLSgfb0ga6w7uYVcEXYDlDV3L1PBffp.0DyvvAUykRU13t8JYt8dDeK4MvuqiYX4Finl9UM1NVFrMpdYUUaqPMxGjLO9ho2"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=91104aed8c9dd6f7';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\/808778168713?__cf_chl_rt_tk=pp2WFQg4KohUTaNPw2UW_e7H.87P0iquf9rRX2SQDWM-1739402252-1.0.1.1-8K5uzC.8sDQV1Z4YNzJKFp2y5jE212E90EtqTAlbu1s" + 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