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-4872305169-gov.caltech-edu.pp.ua/post/4872305169

  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-4872305169-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fe761fda0772e9',cH: 'w_KPeoOMcOMwEtZy2lcEvs.ndLpjsrJeuVIetYyy3XM-1739215278-1.2.1.1-KGa3bWlouDLehNMKD1oBwCZc.vKpdBFXSGZzZuDtfWUT7bZNwVhbnMbZ4ajSqsSf',cUPMDTk: "\/post\/4872305169?__cf_chl_tk=tlFjaG70Dv99rFEB7cjb.bl72GbYli11.1X.mIWN.Rw-1739215278-1.0.1.1-isrqt7YLYZZcNNTFVKBblQ2yNnEIgy6vzM0KCbxPGJI",cFPWv: 'g',cITimeS: '1739215278',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/4872305169?__cf_chl_f_tk=tlFjaG70Dv99rFEB7cjb.bl72GbYli11.1X.mIWN.Rw-1739215278-1.0.1.1-isrqt7YLYZZcNNTFVKBblQ2yNnEIgy6vzM0KCbxPGJI",md: "YSSJYjF1ko5X2obCYkndnTS2anuMJW2wAYucU0cmFdo-1739215278-1.2.1.1-yTPb0FTLvCE6Ve18N3FlM3wo3lC_kGJR8b2fYx1d0QbJjNW5C9FhHRVOgmYDPR8HCtQhHUGWJn0fwh_kyj0EJipA9oCN7.nrugIOxtBe6Q4TJAJQi92cXiQq_qKjLQ8bG4kwfOItLT5EFdVAvtiu3giZJHcMA64QaHEh4l3yqtVHVF_ZO.sN8VnbhyD_BrHX.J1zRxO4d414j43wrS1dtgKDur90nrB4o9iOLgn24w3VIj29nqxUEuKMkPFV6BV9GFyW1QInHrtkBjhjBvut1PipKuCcop9WA_nuipSUWejwrFP1u3dnouQVbPnbgz0KUkJfANRlzk6HJdPgAuT460y_mwBfJVZWs6KRGNZR2q4zDXKEaQifk5f._8gupDSEbVvDlk.MMiwOWApYD9_G7c2jT4D_5bmpYCb6ecFpNi6EcMfoNyin9SNbq.pLxWT1a.r4EC7s4mGZFfNFPhwXQ5wZSu1FcXcisKAmE7HQ0mf0m1_ijnGg8WwmE7qd1XxrEfkhIOBgP5t2a6g9.vzjPgB3QGTHvvihIfAlJwIDvwENvwAB73BR_3PmG9GraTo.Z6eq0JDMFh6mCFvFrc3Cuaeh5b_rMouJxwqTcEM5RJSmcU7lieToONmYsgCgjmYEHxuq_E6GHmjhyuHUlgKNAkIyL5g1buMKpC6NQZMM0HCfueABOzx86uKCDYHt.jQ.ae1YkWxyT2mBN_CQ0kW.aPMli4Hlv1ZWZFRIvBnKLyhfdqbWedI_D_D4uLEA09AT3xjcaIH8P25mOH4785Y_QAuwkLtURDGAKsAiZdDBC_CBCD_JEm9RtgsIfep3CwacHqmzqw1VRTfrs1gmSpYsAqEtPfowonlY3ucmi5bTebQGmIMYaTlPSFcwvamPAjdGxbHBu9znBhfQ4oNapVL8Hho1OBEl6Wgp4bDNqabFmRkSevbqnDOU7uBRQ9AEuXg4RfsTzayTNakORoi2jjEkQEiEcMCDac1MfhWFUTf8o.qjwORgsfJ0gtGdtgJ5eA73xDe.6f_.._jOe4BSz3IZCwfTw.cso8Fh2lDtybSgO91smh1DtMT.AfMyJRxdEDEhDxMSq_MjltJD.48MSU8vnSmV8hTx21Ozbpe9s57mTkV_Gul8dxKBhJsKN7gbCXI98VSLqymhwpOSecP49_N7PQXNhukMPeskIZW4US7Bs9T2sHp6OZeaRtn4UFHTlxyz7sLtmUmsPkOlrRzjVt2zTgtrjxWXvV1GkNE5F2LXe8wqzgFs9ee3xcAr9scq9vhkjyFPfPTks4ImzOeBKYHomvfzio9VHQkmEdk3kvG.sQRqdzq.HMghk5T8QIQ6BKSpzvDqDR8fimmSL3OUVv4b_fhGzEr8dnU2EcGjyzC1bX78yrBV1VUYZTPMUqAvNDPobzoxSTg0cGpHOwUUuNRh0qZj2uVEaKBpov1uhkm_RbjQS.jlhwDRjT004Wt_OIY9u7Bk1XyoFNARnIfebZSEV58KNfk_uERsT0kBg0vu.REIlHd3pHTF45q5wOj3VY88TyVL8mwuaGPCH7cVNXPonDjxcoj9J6B46ZAeZEz.wrdzU8gJYZQNyuGvqfnyPBEN1Cj_vuBCFDFgKJ2zGpV1XH95Qp8GX7w805BBScGP47zwE48B49WIa8KeMKE0.x_Ie0vh49u3rNINBc.EtKFPiU4oCYBdQHFhlybw2aaP9wKdpCvm1tIuM3TWR0Lg2v4njK7uZYI1cvNL7U6Ki5X5FjxXs3NFFZnMC6RsqVep4jW3CWX9NIuRPELHtR8ygiXJEloU9UCB2qiECG6OkERvEZgNNFpuDeHnLJ8WFntGMzGTgTNZCJJXMmckRQJRVXlLbmu7_2bPEHh8QqZfshL.ShIGdwLqgu0IdPTjqDmVdGx20K6JLs.7.fhjSq8r_qrxyTxFBrLypgDEJ2kD7d4_W_wHQJdq1kzhHncL8x2sDuLSriYBfTyQVV44emU_7_CmkRZ3otG.mkQTm3e_aV1jsaSijk77jBMiuueody5TcTdTyKHViymHMyUqtwfb7VTWXRD.7ol04Wjdb8aC.yypibAz7VmNbcGZtcyx_ch6Nlec_IWQpdKvbi2EdYlKjq810.RbnVcH8I.j676hboEbxfc13C.tsd7vDn4JFBZrkCiTnhYNkD2slbi_nzn.IbKw9TXdOOpVallwomxaeNyA7S.Xb6aopJK.zBypWWV8obEMCHp1ApD9hnWH38MI84qlz9o7w1ZiRhiIpqR62YE0og",mdrd: "3RpKkPLD1GthM8wM9TqetFdmxc6bUw8I3K5ldyAIqJc-1739215278-1.2.1.1-KRB1ZVFxRSg612_kB0G6QB1W3d2n5Z3ol3yqtphYtQdm2mCKFAFClRJ9_cDSW90eUT0L.zH7TeKEZY71okg0kcdWeFJg8VLOiyTOA9DV0tUhPpLYVzLpZtoM3_0LJWICT6a253MC8fnU75H7UEU_.q04qhBcarQVN.pzT0JLcVfVki31r5qeKZC6TCuiTIydjUmVLePx9_bhCwjta583TUujQgK8rQvnSxYXM2L0ypxnXv_E8U9X5Funu9e7KM2cgWHjU5cOcqEfy9NKVHzg61vCdM1AOQSJk2ywgNDpiY7gKP1ilaS1sjpS6xYRBfUaQIYc4vgVzfap2pHgUJVZm0eWq1VAoou3bNhIuQ83CyL5OwU2bQARkQI8YEYsO8YlfWbOElBXkd0f5W2sewykXcun9.M710ai5.VyN5ZkGCRgUGLvdqDHM9X3jwQSAISU6vmCYerIz6dhxKpD8JEVzkk2rZZFTOojxMCy2PssZzEaQSYVW7sBXOk8w9AyCFc7kkrYhsohgd0ZE5BVaazqMHDN7EUKvpDLiHkLikjngrnrnX6pC6h4kuuI5revYJ7tgosZztMDIC034e86VN8NamQkcAISsZ91GyWtnSX4mcc1Vw6HyItgs4KR6POqgJaKGZRcYxw_fk24ZOE3t9.hPru_ZXv4EWYcv6E0SQZyswlMR.7T8nYtIhPZw_G_Vk7PlwsV6bPT.PbaT7Cyoop0wVcfbg3sDItyejLnhUfG4zY8tVG.lgkHADc.Cr0twBzGlKK0T8El0EvfP5epEdfcBo_PZs.mEuIrPt4Az9LDOrB7rzG_8INl2jdrEUuXdQQMjEcLLcgWY.kHfsYwR2kD4YRx2SQrgwhbjkARcf1UPPjSkHBVyxK6jDNs6neImMsTVAQxhSdH8L3CfMcvt799lzaV7_8D6Ss3p4lzjCMGr7_.rvqDqEimXTDzPQTusFY3v.Nrh9WI1MykcqJEc1eJYJaN6x8GnecHLIGwLzGDmAGiTWTLiv5Qf4ZugzNDphM6jJ.evNbLu4MMzSh5HiNkvwW7JJLFwgptXxmeO.o04sJZie.UhlOvw8DkxXzYCNUiO_9Kha3uOVvE9t75aAPeTcQ77xYMVdGaPKPR99uzjJZgEBZ638CLounR8Mtg8J9fVO3RURS9RYQVz.Nucw02KOlK2f3qvgJ0dcxEJYvWRlfcTexjKtlK5jPUY63s9VfLrBaxNiCMmKDGCOrXOmKJtOJmGX3MSkRhUs69al8BSU71yn6Mb3TUWe4BHaJNm.f3tyZDEu9ID62.5ixfmEmnUcT5L34O3WTA2ganKgRF4ews9ZwfcBeZMgq_s01vGnU9X_0vfdoUtlV.g4ENUrpPI7eencfdHlqBJFU7eWmx8zPavrabX2XjKQdEomDTrBkLkdv0MUfFp_eKSSseHNQjAIukI0caNDcqThQ8VATLUGGRGJrGx5hNXPlamQRi0VWYyssz57ShLiffXmkHB0UZzGg4959SPQ.m69VhdISYcZAe2g52FxfQ6H2Qdebb3guz4_mIaJRddR5U3SmgcKoHwxN.4ChjcSVi9Vb_nMAnhbKDJSk27BC1lk0QonlDYwaNcmD1S_dsHmZgkOlKBTDkRMApRFasFFe7mYkfpDvYpbuMv2_YK6_pC_hi.uwpIZB.9H4oIN0jLnX1QNyjhuBFzhwSCKc8ouP28_wWqmayHw98eClzoOkm_fPYh7GEdh1D.6wqUnyZ4tXl3JQ2fdbqrfjTGVDkxVajCZfvwmeqVkkj4Qv9gar_2jdj5icWSHZH8vJdLXGmQLMMpiTgCCiQY3ML6KDM0MbstBUlv4D297ngIRVNhNmIsxWLkjUC0tk75ABHsr0Pxf4hEOBU5rnRmQ"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fe761fda0772e9';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\/4872305169?__cf_chl_rt_tk=tlFjaG70Dv99rFEB7cjb.bl72GbYli11.1X.mIWN.Rw-1739215278-1.0.1.1-isrqt7YLYZZcNNTFVKBblQ2yNnEIgy6vzM0KCbxPGJI" + 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