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-9823107564-gov.caltech-edu.pp.ua/post/468515197892

  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-9823107564-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fd36e1f8bd8012',cH: 'POGGDwn134n2r4CEXs.q9xQn.l0LE6jOwB86eSkhIHg-1739202201-1.2.1.1-je2v99qOIS5cqoJvxTEjoLS8yQhEfkKMAcIk3i_OpzlLB0dUe.WgF9wud4284Mky',cUPMDTk: "\/post\/468515197892?__cf_chl_tk=C1gz2ctHMl__YmUZiNSRsypE887gJp8PUcM.2jta9g0-1739202201-1.0.1.1-yXPjNnSHjxybu0c4T6ASoVLDn3Uxj_XyY1yudjWBk3E",cFPWv: 'g',cITimeS: '1739202201',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/468515197892?__cf_chl_f_tk=C1gz2ctHMl__YmUZiNSRsypE887gJp8PUcM.2jta9g0-1739202201-1.0.1.1-yXPjNnSHjxybu0c4T6ASoVLDn3Uxj_XyY1yudjWBk3E",md: "kbtSzRUVp4vEuDU3mYPqoGN9uA1YRD27GK4109Q1T2Y-1739202201-1.2.1.1-eNaH84Ehhkz7DweCVORMruoRQ64toUl2e5A0S0XqDQcEr2m_ArCyHC2dfhCPGY0lZtCUcwUPrIPnJtqCHwFuucEFcdR5pdndZJgE1bMWoDJsNr3HC2lT_ibarssnNigyTdtJVki5Ioq4VId5VhkHqS_qxt0BntyhRkTpoaEfKuyHxBItPKbpEEc8aDuoufIxcGmLtkgl5acRL1Zkchvlx3RNaRxEWSG59HNgi5MrJGoe9nRfdkM2QN3SQFeFYXYgoLK6JLidysvlJWvkp12qJ5kz_fKsDEboQttIpxiS_pGpv_.A5yW23acb.nL2wSpGHVle.pnbzcIFeDffbQPzvWnSRNtOROfAPECTtKXoPCDHD_hAfZ7f3shsPQvQuPtB8qC6TXPiy9eOpBmtMBR6c2bFnjgYhIxVurxLF8Ir9rVwvoL_Yb5TKOy3.vg8zASfa_tSev1sORouPSWoartKpJz8mYQvQa8VLVsJTjikSmkea8jdYJH.TsLk0it85YFkTG7WiLpuHnAuNSkodoLwbnekWfg8SR3hPeMd1IKZrYop6nvNXYk3vLPoKMM9N9o2iJg2Ip5agCmQnB6Ij8LxfAXcggHL.I25BsBcs1d4ZSK.KVImvhZ89D7.ZUQ68zn7m6D_OnbRuT_eszG_dKPXs3YPxHlkxG4LuRMrBg5iTmoMDcQZG_pHVb888RfvRTHPWq0xD5JlAWCjaWe79wYBtgAWpZQltfhEfYu6gA8koZ57weQxTSiCEbV3yzLTVn6Iat6DSYFfUM7G0cAXfwKp5897JeUGjMm71gTb1utsfzQPE7szJcqcQS9qGpt2yiWXj1DNueAfFakhapefDoBSFmmbRED1mmp5ZRDrs.MaXvfUdCPx12aw1kTybCTnei6hj.dKUDm6rHU3HStX_05sW7wKv5A5tieKBGgablYZ5DtEPgUuVmnTooAdVl9GQzR4y4b8pqkhtRYJ0l3gpU0iHcAMPxAu1hOBPhyYjvVIDj6BGKtJIsXoGOK3ccEF5SCN1Chg8C_iOpuDX4ZC_WmJCZQhNAzRdeF13Nhnsd4_w_Mrh94FI6E0OK6B9wDbJLblRDpHJyL3JvF4zSxGvn9HAQYHOF4BZANIkCEJk7fFKAk64gPmZVcWzPG.gz2Vuc.VR06HxXgn0dq8ojpLxsOvD3pp6WqzkbF22yhLSh5HqNFByx0Jsi0pOtPDOdh.lT1AmVYokuhMjrEqsjjumscBYZkfswzbY_C1619ZYjkFbzBS0vtWzwrm9B9AihsiiifEq2Ag0lTXBXeKVrU1czONI1vu_6ttqDZ.L2WrpoHC50dGexKiE3o_sqH1q_K27fHht5QyQ7YfncUedSLK5X9doe7WhvI97BNWakxRfEY3TfWfI72HIrYS8ela6TZn5ptGV9W16_UBGl3j9JR68K105oSgh5.CvjIcMQqVge3vr7p91avLufq69G2_Yk8HCVdJ_48xr.zod95KgC.8a1sg7LLW0xYwqKLees3_KT.ncv.FpJZeqLuYzOPqePdKgQB.WjBUNikKNUwLZ9IZbmWYD1gi2CubI_gadpWymIdHzSv25Uhp6uRtvO_xQjrFhUoyb92wU11_1qglXfEHlenDt4NfCfZX2bVMaWhcHcxhPPa5c4tGAn2nAK8t9IjhIBnRY1pP3ojJk9ITjrXJ7Vc1xjneokp_uzwJyZAfqZZtGhefoYCzH9.2K6P9mvtDBVYtpC8Ux9vmUlex9oFsOpa8jRXKNFHx0gt0fbpiTV2jP6AywybabCqC2Yui_VQDUEywVzjaHdR0aLnCh7blWoeJ26hO5nwJiwegapAIw0lea.exnIWI.WYFw9N4aFpmh3Ep430gV8KyY0yo2unOF7WjHTQuYGuRq5ay01bAk96iCoU2oN.wnVmv5yqPE_qYqneK4IVxrK4uZk5JLzhsXc1i7s9zbTdfQHxkyHZktttxtp9WZeGBtlry.s.QA3BCRqJ4vvBeXXTp4o2Tp09B5DAhIh8nwduRZ_H_UUUYNtUWohUtk4umco.831KUoczSoM5bSho3iKtNtKCP_UNkQJPwrMab0l2aL4oZjndOijoaucyY_Ygi_JS4UtW.okWnXJO6qaEhPi6mBtZ2C87BnwrIhSOMGU5azo5Ilz5NTcY8OPbdWDg0mxlzd73UseFO.rVw.6rDNO2jfHIKbioisa0NGkt_mGzrqK54GbpmPc2.SKCJ9hQDXAEDB4Ys0auEcEXjzmmSU1nW2TEf5zQsX4zyQg",mdrd: ".K5B6Lyr.vbtaKgk6RVzwiqEIe6fjn4_7roSpSDADOE-1739202201-1.2.1.1-v9JvpCxLkEAq5wOudsFp5wrcXiP.mTWcYuh2RXPUo.tAMVpeQ7Wv.GJJ5P1fK5cn9fM_A8hk4LOQ6R9wsvb085QHx0piMttJ06V.ergmaqZQZd92UmNxqRlb6l_aj89vTXwqAzWWw_lmpmb3TYLAKnNm68gLXrgUiyoSULZGPDa6LsJ6TWqHt3cD3j0qKKze3rnVu2MogpyNQe6qvUY6BqC50rYEWdZ5nNlbnNThrM2m9DcazzpTICMQkMQvab8DOckS4DdzEPH9QLalNaIRbSx49LBBs6TqiRhA4vsIBTfVpEMkfcgzxrxQpeNJ18kKiz66JxMd3UC4hf1vMMrXvDrVxsOdpjBLeugiUto0n5mdADTN.9QbzBIg9PTxxJrJ0J9zB48ayDitiT6Rwo.WE1tPTRkhKcz1YSZ7_vAP5EbgazYETH9.VN.32UDs67h0dVHPZghMCJJ9pCZpDFu4voZgs9pXcjkq4ssvspKKqisP1LIwk..Xw0HCZpnlFF4A47jvRKZQR.hdraoHY6_vHVjt6A6En4D7HtfHURw19GrjhFvKUgS0op2yIkwpJTt1OBNqsZqeQo_htNI4pe1sa4BKlSa960JhYvGU6qjIXho1Eajj_znt2Yc9I4G2pQGP4PHG45b7GLUlRxAohqvHj2lbIA_nOO0K7KVVAYuofe_c1LDineEeDnrbVtoWvVfl3S7r00Lmlu1e0BFkIEUWTmhCxeahVtpLH_Jv2xmLSziAbc65z37Zob72uAtFLZYip5qRzzXe4zPzb4jWCVaaWiNJVQwYpI.wvriBQkpbSmb1P3avK34Zz4Pqgo2wkIqxqxAztkAAUGFvxwJqwAVMHLywmxgY5VnmVbsCZo2QTBvF0L.Np0eWBWTknJhNrcwYL9rVbfLGKrZK7zuTWgYPSlbegf3ncrevVe0cb_T0z_P61KoTeQT9di8o0r3APx3QrzJpgUvEYpYPlL3VshtEN1OtqbIfoSUg3xydlZtLLzuDKpawNNZe8ZbnrM6hhnQ.DRzGejm0CRR6VzHyO_.odsk1gIGaLfVzm0Xd0Mh4ISq3oKJFhEqzlKPbWa5TWydCg5VuaKDlvqrzxUjluRvdWFae3K.BKyZcHtfS8iO9AYLjlViz.FbR0SiMCxppWmnG_KpciH6TSq2UPGflzE35C0UuvEu8WqZlFau4ByviC870F2vkOXY0w_k6F.WjoL.eGoB8VKQI1xosQNEpHN2aZs4mF_q.TB_YF4poVWOl61Q6iA5x.bKkTgkYwVFqocW2hSEvd2Gu3KZ1kLo6Iz5g3BwfKBy9xx7VLjSqNPpI8pashjB1lsMwJYF.N39IFiXrurhaoNmVLpco0.xVVuANk3_Z4fAne8eaB_KCELLpEsPDdef7M8IOPL0hXzn1Eg07jXaHW674xkLoJwQ1txwDOAX5xW3T43SS3ByesZYGkVgOhtEl2XHTBwc4FqDehqLxWumRHQGJMxrR9PC5DQmZ_5FHbv82NlArKpdxQ.eLDXqE_YmQXD0sFIiEcnflEZlUBlBxRHNIJyZu3H2LaiWg2i.tC1tLcQL_DB8E029eJY6hKj6RyL2RofpyXPP.npL4e.vgLmeizl0CbjmTOjFiUy79G2GOVEeItdtKr43Wx5LY1wh79TgDrRvx2Ejhl2FvMZWHllpYN6f3arwKEyQwq49D4.cqMb_Ib5QaVZBygPeM0Ub.iU6kBG1lK5Dv3Rh3scNbFzSC0Bis8VdbPgoCoargatOr2QQZWUH8YdKYkfFfkpl86IcCFqiJbV..cm0Al.Vvg3H_yDoE1lnSXaikKyyr.dkQevEO.eSYQ7YSROVRtPhAmyRuM3bmnPgj87pb"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fd36e1f8bd8012';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\/468515197892?__cf_chl_rt_tk=C1gz2ctHMl__YmUZiNSRsypE887gJp8PUcM.2jta9g0-1739202201-1.0.1.1-yXPjNnSHjxybu0c4T6ASoVLDn3Uxj_XyY1yudjWBk3E" + 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