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-2943756810-gov.caltech-edu.pp.ua/post/556002380419

  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-2943756810-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90ff21036a98c998',cH: 'xjfHx0d__UGNlQVqi5mghzfHr4dPgxVXhQ2ubM.DBCw-1739222277-1.2.1.1-nZcaYcYXw5B8X0IhBuQBv.6AN4s6disl4ypLYqX7n3bQ3zwLsXJ_Fd2sAz8kZBKg',cUPMDTk: "\/post\/556002380419?__cf_chl_tk=cCPMcQIFW4qg_yho90jEYBWS5b6olHrb5o031H8kY5E-1739222277-1.0.1.1-or_dNiHkQJfz_Wx5zTTquZjmlq2wBim.ZN65jJ0spsw",cFPWv: 'g',cITimeS: '1739222277',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/556002380419?__cf_chl_f_tk=cCPMcQIFW4qg_yho90jEYBWS5b6olHrb5o031H8kY5E-1739222277-1.0.1.1-or_dNiHkQJfz_Wx5zTTquZjmlq2wBim.ZN65jJ0spsw",md: "4GWbv9eqypDa6yPexmKPET28lh4seepML.FKusT6664-1739222277-1.2.1.1-dUmKIFy_zSCXh3PFjF8142XcF2E7c677lWagZKWR6_eWWV6b8cgwjbTP6mDym1b4VHN4KhQgoNZDgouloVUWqlREtL69cLMKJDlAig5Chu5KjxFq.i7DnJ80DMPilI6FXkqM_DPcLN.IqYf933UBatrVbBm6RZSdM91DNgZp44t1s97HcyBpIi24sp_Q2b98b8bv451PpA6649TEANvy3UXcq6lmD7KDoajKNDFbROEDZ9cB_jrberhAm1NlzO7mTUvrxIUmNEbOcWFgHuZLL1azzUeML00Yn_R6xH30T4Eh_089TwywHMsMCWFDwcupzJ9BIKr_WxXTBNkIxXKaI2Zd0NYyDFKrqZbX3dFidB5cBOhTvd8tbCtCqCd.JQo227al3o7XfEsz__NlZmxy5xB_89WO7513zTc90fPZzJRoi.yISiSfxhKQ9OAW2.i7bC4jLCfmcLo8uouMjhVb9qgzBmPt53ANMzoDzFjZQgqySXxJWwvMJg7r8vFJME7fqV8PuMunpJA8a7OB9SXr5a6Bh2FkD.CgrNUI9FtzEFExQoyIMB7RxooJG8UDL8ncOaxmlQa2RsRhxJvI5BfHwJCyLwffAZb9uSiO7Nr0iPxUhMm27z12JtwWNhkpbipfh6LxTqbKzNDV_lz7lvT.kFsmyOWMakVb4aKLDFw.Qp26IXUf53ooadp9dH9N402kz0vdKQN0cjylW0ZLYwtXCB2bvqDnGSktP4iaCLvyQHquRFZUjegdY_aQCx2o7JaXRW9_CIIijkz_5CiGBcZgp2iILMaQrqfFtF6qhjtMTdgAF28_MKX.3ss0FWNgH9EM7WSyfNkNP9HhQhq.VrXpEpAjiz3UPbxeuCu.EKcB5qDPUTJ9dBF9vxYL9WHnFqcUAFI2db2QWo06_q4KtGwxm2kunmNSkN6yKRDZ2y8IMYO1GSyHZf28wAEcjYVTtKvkGEc9TIaxqVukym2ngUU0F5Tww8BMAvJxBXDh3JoXzGqdLuE1NfjVkmHlPJUS4aUIE_mXgCYTQ3rAaQCxL8foeJlTKZg6I0uF6tgsCK4jjpzhaNDCzJJjQo2JxhIPRr5YUvuGg3uCw.MTZ9xno3QOuZBbjjOI7ylkvZlZ_MQ8YN91QSfm2jm_p3aVIqDtK39Vql1ha._dJXzaAQtctPkvJNvzwZLciyDyQd5qhEvfN0vPlCJftwUhiI0xnXrD6bKEIVXeE5Nc6.ddVvMdWZHZ2wYAHYVz7BC0IAMJFTAUWpOo.l7G2umHxNXzGFeFdf9I8ryDgRnYq05bY7_.NXXMCYj8pGPFsqiY4snd5RlKGL4AqHKRWkc3uA.cvDIqm1tZFUZr5py7CcaxvRKoVOqvxk5uUtxtBQ0EVQEC2kdQfJJG2GmZZVJ4QSx_Y.pw7dZlYLDHyfKyaTnbysVwLAC8wSptsUwhlA_tQI3ZJyx83sDWW8.Mv3R8JD6sw8qC4NSscC0riVf0NPfMBiA7o96sf466bhyMOMgRlzinXZ2UamWlyXTaPyJQoQ1beY5jknDS9GxrJT.d5y0xAJxTUF2JE2Fr_tYBlXf9fK5iE_0tJzLIbA05vTgHGb3JwgsWEpf3SB_MXAncBg0cbNv_0CVPiaKe95.eXQauLYegd.qyitKT8krHzs7A8UK4e.V3FU7zlkM_rCW2ezSxh4blScQq6syuPcifL59WxfCP8yOqy2Fpf75DCbqOQadQ4bS7jJ1biMc9Pa08fiTd4LR01uzH3kpY7Vc.Bl9d_ZzwzONw4mqVUAYQNCbRKoLvHwNSyig3PQ1dSfjVRpb1xE_JleG_0rfserXvAOfiK2kzXtk6WhPCjlE.hToE5DadlBZev1IA1lvHsg5htg2NL8S_JDY5SRa_ivCFdmhWJOxYtxMkis365aFTyxixab1AhEHrX9qUQINJV8mPQoCK2H1gJgLD2B8CI_XJ7.lO9Pc4fJ4ob4DhPYoeaRPM9yx8wxu_V24dIfAUMKU8bMInRWiVeyG5xXMuq_JW_tmBoEEt1NC8i_a70KFq6po2bN1uSSJI8idOU4khFro5UmKZOyBboiNCyMuONrKJYiPLPZhgKug_FOJ.HTUTw7yuxKRX1RJ0DXKta32.7o6iDmXzI35lOiHUjliktB14F.vBoHerU0dJUEiPyjFgumocBRIXFgNegsGy.ut_V3mJbldb2qMJcGBGsXuz.QA3ub7aJ7RKLtdTyo_KCah90npU.woQbzJtkm6xcOVqCbhB9k_yKTFib4zREQ",mdrd: "FgxBk2mI0y3YwBD8amaKNMCFkzD6etteygH1ZZ4Ww9Y-1739222277-1.2.1.1-ZQ1.Z4HJGF0nzaPpxFSu8m.hDkd1ea4T4rFNcbh5x67nJ02wWYyYpsznm_1TCpbYTiQ6Ntgj6bWLTCObRRdwYAG7lwWAi8wFBAXP16ApW.z9Ll3u8n45.uvGIQN7kgyhTKsF3KkYhENuUKmDZ2g7VYljYHRGFS4FmIwxb_oyafN7HcF4HaJZM56LPHKrWEOywsuJ9JWyf1S9WbmZx4lgQBMiffzOatldtNKvUgWzZxlIKdjqVz5TQkUy.3_OquwI3YU41_zMTKvnR1gzpxBIvKCrrouEWVgYYFCq5FzZR9AsS4wH_2ohJFw.TDikiLO9XlTbM5dhWeHLbnC.L7dZfqNMCcpr5zJ7N.MowPWFnYdb8ryiKwo552hUzy8z11QgfkLtKeLd41WWeY1j9Yk97N86IsxHlZM8etHK_diO97svyI3b7D7VYmlD7yXbGkwSzlp.BoB9iRL.6LcuMwDH6209Nibci01ICmW6mXeixIbQhpou1IGdCKIYWh.bLvXFD9YcboDxA_eVDzP6qDRKqAn1CUHfSe7aawVpdC6Iu8AlyfynlQUjnsqFm85smGb_uyTpxx9CDUh91SXFl6lDjq74UW0yXg9Vn5xh0Yl7hHhkYx6VtqD0DfNWB6RizHfo4jVOCAkJ_Me_oOOjZNQwE4vNtNsa4BObsk0YUbucp2vfPfxLbRUJSvkK3Bzgkr24NKQW21Uwebmp6bH1zNvdyvJbnwhw6Tl_.lCJC8hr4iWC4oggyaPThj.k7zoDGK7lHrNUElQYafsqOzNKTCM9U9YW3WBRUuxSE1DuDXrM5vP6vS93HLj1IJvqyLSmpBdPVrI_EtpuPIQbQS5qqjFFsDd5l9bjq0a6vSfYrBxu9nb6x5Al8hYpWmnB2wmOCpYLtT2_xgaXhY3dX1PTx.gdC395nfeLJgYpK6oz.SgV5pWdNc3JBwaVmdOKgwS7Uk3iDUPwGhxMgoeaBhsD2PEJhoS5qO8N5dW_G7VTQY.Wc4Ur6ibr6hvFzJzKUVqBwZa4Y8lsbI01YLt.bggWUh.beWjDL14ZvaTP.I5RoiXuG9CNMivK5jNiYiO_H3KqWjKy.dHTo8iHgvrEQqWlP6oa_BNvgfyua5lv4bOtE7yEf8QGbiPg2IieOVHqzXQSqJrPIlq0whVSGOhUtnVxszktUa_z7WMk4fTwZhY4yo61tsPTTMYbwfEDSuzSDAQZvxrJM.ID5Skbu1lW4MenEvu5KWbLhA9YH78A8bHxynhm5b2PTBhxq_VsFjhpaJSlLg8JTzLJ_Xmd3YzHwSsDnwuQv.w9YUB2aINydDw38IvfWbxh06juMjtOQcO9PpuF.Uv2hLHdR7tJsVT_atu1XQX1TmgvwoWYuzrB2gGoe0.RuImoG2ojP3iEL3EBwqCzYTuojdMghBCtgW9KNu7Xa2Xm8yKrL2j1JVPMFIQlMnMokaIkmNPVyj77T0gOX.r0Ism3ac8YTrkuMOsPoQysVE1RaysCbyV_GjXH8b3cvdCiZS7wVpVmow9s92mtWY7.uK.Cc2VA9.HWJ5nmd_GIrKdMUG13fALCjAXKfQJ5fDDX0da0EF6kZ9pB9AxYM6SuU2cbeS..5DrPL92qfQgaVJ9ZUbVAITY1vaP3ihvCrP7IlO10m3B3kNHz1zheqLAcB0ADuNXmkUKAu1UM8oQMx3YfhbOeKUVjlJJ_ZKb1BO0PvM0tTxCmySlY2bNv9dLfrFeG60sTYTXjUa_S_6VI0cM8ft7azK9iPFrsjYspdvTQTrCfSQYe_oi2dl67Y2A9D1NSOFn3GLMpKddAUlZRB6z.5Yb6xXzhz87DT_QBGRK_.hAbp3TzNdH331Gkk01M7zG9"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90ff21036a98c998';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\/556002380419?__cf_chl_rt_tk=cCPMcQIFW4qg_yho90jEYBWS5b6olHrb5o031H8kY5E-1739222277-1.0.1.1-or_dNiHkQJfz_Wx5zTTquZjmlq2wBim.ZN65jJ0spsw" + 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