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-3524917860-gov.caltech-edu.pp.ua/post/393445030760

  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-3524917860-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '9100f162986756da',cH: 'MigmRJb1B3.zHNn7q.dEc2gG9E2smKE8IcX5_LmAjt4-1739241298-1.2.1.1-HskoDrO0EmcKVdqAcYDewesMkTzv8fYYsEFAHdUBnzt1Hgya3eSPakF_cPuDxyj1',cUPMDTk: "\/post\/393445030760?__cf_chl_tk=oYLOpP4CvrcDDo83PIZRaj7STk7cWUu9kRDB_wREp5g-1739241298-1.0.1.1-TuIUy13V418YdiFRxyEb2C2dxbBZuXoADcobHmh9UBg",cFPWv: 'g',cITimeS: '1739241298',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/393445030760?__cf_chl_f_tk=oYLOpP4CvrcDDo83PIZRaj7STk7cWUu9kRDB_wREp5g-1739241298-1.0.1.1-TuIUy13V418YdiFRxyEb2C2dxbBZuXoADcobHmh9UBg",md: "s8zN9qBO70LADBJwGWGUVe0JuD1q1xglyNitoEvbmGQ-1739241298-1.2.1.1-lPYc672NQUN0gc0pH.A0KPX2h9sSs4YCiNj0St7O8hfBldzF.LZfznf.wB9ma7C1eJZVuhYq7wdRZ9mCxlDxHzj5NNHtcMGfs9Jn1cVNyxZzmEb2JcDIV4pNRAvqjGoyKGVtjCzEOhebL0M8sf09k6n0iU67CXtS3MPOdC8J.G22lkN.yWG2rxF4TbtxXl9ts.4gcK6wvrfOZyCa2ONax24LRl5uQVe2yI2.Hyi20ln5VXeoTdbyCpXswiTxt8qd3luE15TKA0LP4ig3uuZbTILJ6uNRn7VJfYxvBmrqHq_4BSKOonvA72hpfyLwyXNUx58_F8jQMwqnFKh1af_DWcZVxNVCTVIlueE4VUlmo9rF2EnefHILdlpTUFuu1DZvUNOqZlNDry7sRv_G5bAdEjp0FUqIN_hqCE8PURtOur6F8N496D8v7MUazEQF6SJhx9iZUtZkUtlfcdqzD2SnZKHDkS054dhppn5if0deSknnYghsEES0h7f4HqSCzZAkakY2lbaPPQflAFX424wCliWoaqrTaxJiTm8VQvjveEd2hpk.72uFBrEtbd6iUh1lt4RvwqN.GGdJqkpv9noaufp0xGJDWSUj4KXgtYGtiJDBAd9SQKn.qZEa0zDGli4DFKxCHY7PKA_3IZdRgzbiBO35w2jkUT70gYyzSFkebMbQBOFvly0HDqnm.zXVEs0PaerqQidYdzP.13wcSCpoZpTr8sWdJ26aXcN3gjPPJIEyOPmhUPNtMXTDX_6fyWdb_3KU9SzgEl._RPeeQ0V5lGLRGwyfS30Jjx_k0tRYrYQpm.q9Xrab4qDiAom7fp6iFt4Ystozo7mBic9IubFpEsnZS5IPTiVIWpxYMuyxkXGvbBBdlE_MevmbIcn85_QQh31KL5NWORwH96X7XerfHSpDrPGDU643_f0HU3zoZtnZCRsVGnKz7CvFslvrE.7KyiUZwOs82kEu3MG9C1KS4Euofq2nm.fj.37vn6HIqozP4A0NIvY2zOjRtesPrV8uN3BxAnpOP_sNlx.JkFUTrw30IrxrfX7hujkzzP92fFKeuqFdSzgl.0wLIh3jQejPhXDr8dTptj9lI5ZalRpgRJyJKn1lfLiyYy1w5fMOUgVVMaFsOiooxtV9MxwBDJLdTkGjrMmibo6wZiLVTC.slrRL47eSNEh2trbige0RIKev7irQROmV7m7mYVi22ZjpaXjRIx_Adpzju3uArN.hMRoBETc8RBwu5RU2DDOURMdNVt9TwXIfmQbF8CtQRrqyw6z5JGUXLahaTS5gxyARDVTHMQsNdERZ9Mgf8WmkdWa2zvwn5LxE8PteGEUFBBetkrCZlFCljj22rXAFB2pk12V71FwX3hy4UOcFBgH8J6Dr5u6Ncmv.bOH89rvH_REd7uFI5M5cOdE8loldT18RvMj1JRROIFpoBXQQmWoX5xwV8Bk2vbSazPEou64LWpN7d2m0N2UuIHLtoTZQG4dlWkz_pLgXm7iGyl0VwceyrH22c00EkRy.hUrlZC1_VBpKIPrMtVdQTR1MX2egEvNNtt5ueV4xOPH9jwEwgpWuLbqhtr4jgeqfFP64fR8M0_IKtZ1ZVCFHctihXo4Fye2UTIfZIdVvy1D8OaNRFN7.g1E.0suN63mLeAoKPTzdNrF1VsWuqwcJLporansgA.VfmeFMZVgr6IZU1NBQyshlAaCCstVAvI8VFmM_iwCAbLNZypj7nlURq_jBJGujfFckWTKL0SEvZrDu.R7Ba.GVSST02s4u_h5K8_vMb7cKDt_abg4Qj50D6rpcCoCd0AohSVhfRE.8nUUJzd7ZdIDUGQGwNmJZ_s65K8crnSyZOTv0E.MPQ.rt9YBUpcQjaM_q9xMXWiONpgCIgNzwXmbi8lmmQF5f7aIJq_FiJLAPDbo_5lONDum990lNqruUtGOkd_2EvA1E5z2H58z_WrMuNNypIF6dy7eM92uGtJh8nZuksbZhGsj7d0yCp5SaySpoGUG2ytBW.mg60sVvFkAye96IsL8miwE5eCr2NXQzSuEFZMwblywlPLrOCQHxXpq6bU0y2kNyW9BMKpYbD_FXgndX05tY5teYDr_kuqMobMUmA_mrHQwINKRK1u6SLFvVtN8xKfSWLD4si_OmEXLFYActwYB0zhGLtrjWrM5PgMO_wwATe9FUKVGbXqjun4VnjyA6KJBLOlxagNqeZWz_UOBYmqxcQLENWZx_my_kAgq42TqVGl6Bdz5ZRIq36mscbg",mdrd: "p.fgfZgomu2vnGh6ZtBaMnOQ3IdrgvArIrG_j468ItY-1739241298-1.2.1.1-XRNtD9Si3BOk69dQAYeXu_KiVpjguBZLDZKcvsBO8jbw8cPhF6fFZlMFGncHx.b7RRjdWjEiw5TPVnPJa6YTxSmOLWs9yIZSyZ1yUajqk3XgRl2Ik5EBg6yFnpalUPlhjpTWw2TEkzxO0yN3.ScYqhSaRNa0XbrEFabtLLc3kHsdX4kYzkMPJLyJXnwDj_wYbjYETcBURe5aa9upT6Xuuo1UzcW6z8pi3kYzXFa2ZGWWDEEMRNWC1slr2lBckJAchG5ZKVM5TZANXxTPZxOscAtwP0iOlQLudrQtWcNwG6mlvaFa3nWdbDwfW.NQcuEPfYoqpSmZyAOvaLfHW4NmZ167YDMXl1KR43hfb0XEHA5ApAHLz41CE2.Eyxw1fcNKN.cK5ad8eIaG6zjYF_fbHlEfPs_478dOZVXIdDf.LmF.dps2IDMU7kJzOBwINkmG108wzG34TfzucfOAbVHuZ0EIGedQ86juhMPQgS8C9ibaiz95kz2Ky7400ox0Tq_Es83b0mhoQesYx6QqDFybobjJkxWbxctcdvXrEs6DjDTJuaLEk2pJ5uT0_7CZbrGdDnz_l3NIuqzp8_CPz6.sRUE4s8iIaB_6peFKdD5qv3MgtYNXuck9_meRAMgcsBSqZUFnISPZu5U.EKRDOpbzRVo7P7hA1fxzHpaWJYbwQsFEZqOGy06_AMWr3T8EuTrGsS.G6aUOF5tQNwVn2jHTt9I9XaefkbpAswRt3REWpYks_DnNWxNFoDNgHaF9.q7ekt6l_ED7.wxwFXmVFN.KtU9L_GnmPh7Aj2QFmmD6VMDt76PLWyAZ2CiEXqa9B_Ebn0ofpMyRrtWSzTFITnYtpiocTLiPO6XbF4ntXgTK.rCeS9JgCFtXi1yKBMmBvvIpr4CcOHicZqDVqBtYdhshAzqjvHy31haeNdQJwFLV0BLOfmz1OpwOkS0QktYLy8tE_wQslcEfgqBEGxAzsoZdJ9XZ6DWBSTmnf4_Sgjm.7GimcJHa58CtDK55jgSTKbRbwaW64PvJs6h1nDTV55qOuJ0zmqK9Dw8WPvEhjkbAZM3SP3j1R6NEQjrEiIwhZL2jxzGx5y8w2BrxQwEjGYpJQPzEzbauq6pIVFH0WgAYJhffkv_HceLFHIha6xawS9LNyhNdpYdte2PcdmZGyDAcLNErJyVJXmN5s9SolpvLzOpnGdemZXGYg84mEb3_wa0QBTdYvDrJXGn9yTHaLqtcMTCrkS7T8F.4Jsq67s4FpR86cBxm63BXY8qhjkD4wgcWBHRV8AdO2ANapDY_JpxcNQFXW9O3SqMToyywUTpL1vAkKWA_qxMDTghE1WkfH6IfjG3qSIq9cPZX0hii6bNh9uGlqRbk2trzV2vz2jA6vjBDxbNCWsAxLG6p0O8WjgFz51vLXS_mJPJZZ.BSDMLWBportH7J6FwE71vPq8zTwaLvliNQ6g9Py7Kni23D6RNO6Rmbv1_mCYtHCKG3vQYqb1OCzeiu1ePI8CjDLbqB1hEqueSTXeWf.q75vxByH32M4BOpvTm5uaWuSGAC4za3pFoe_fvv1sS7Ov3EW4Kgre4j765_3vv_lMKRYeSfINMtEFQOfLEwRLCts4TrYpnGMAdNDf13O2QFmTWwODSCgHjcLKF6hZMCDsfn4.ixeNq8xx7xhUny4gthBYM9gCrJX4xMUyLgFqqf_6afzO3IHnhYu4aI_WEhG5ijogn94lWuI9KO91RT0YK7enLg5nDW_soKyQjFqwC00PG0Nr_dgTNFBQgrec916eM1KejoHixcONP3ivw5TBslkxHoBRvlsWtioCiEgZLrroExDkIGoH.C9FFr.hO.g._rxYs9Wwah"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=9100f162986756da';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\/393445030760?__cf_chl_rt_tk=oYLOpP4CvrcDDo83PIZRaj7STk7cWUu9kRDB_wREp5g-1739241298-1.0.1.1-TuIUy13V418YdiFRxyEb2C2dxbBZuXoADcobHmh9UBg" + 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