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-8407216359-gov.caltech-edu.pp.ua/post/715398735060

  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-8407216359-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fffb913db8ef64',cH: '5UTtlLMik_XIrPQ1kd_VLcDEUhlcGVbldJvrrrMHapI-1739231229-1.2.1.1-Xuk0ih8XPtX2.S_S0y5g7WfPhM8JobL.Am_bHwQ9iXJhPZkyMgpXWQnlj6eyBAtr',cUPMDTk: "\/post\/715398735060?__cf_chl_tk=AVJ3CXxbrHLpzHfBkq.6Bb8N8.nAfVcC9qULQ3FZIwE-1739231229-1.0.1.1-IQcBBykI59xR8BUfPQkeN2uumvn._nu21nsU5dX2LMA",cFPWv: 'g',cITimeS: '1739231229',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/715398735060?__cf_chl_f_tk=AVJ3CXxbrHLpzHfBkq.6Bb8N8.nAfVcC9qULQ3FZIwE-1739231229-1.0.1.1-IQcBBykI59xR8BUfPQkeN2uumvn._nu21nsU5dX2LMA",md: "W9tfHpYpABc97AIKfrLe0piT8n20ZxhCz391AqHoQHM-1739231229-1.2.1.1-MKkuyij4aD1CU1jUNL._fN4pJYUOj.u9jIQDzTs4jVTppE4ix58m.e6WyhgVGuHm.t2mvm8BgpXbQlwQa8n_LVxjsl201dka54i6MzBUXR3SYuzt0dkNeSGKZvNXPAoAIzkrgaNCyhCCMvcozC2hIStjvjuSSq_cP4Lgkbf_n8s_t7bzqJvfEH2Hv1t0pKTklCcJcRIswN56INahHk3twQIfUgjExyjOH_gcuXYroU5fwriQKKOQffPXzecsNmflLafT0xnMJazPK6MKREvkbjg18FXtsZ9TXfx0pxchDUfPV6jIFoc0x5ZPKDMmW8EU5vSbiEkgH3lrLpRp1JoiK6VJDOibHKAO0fpE.GHe5FMppZA6N6DtuMvB_4ycppN937rODgkSTLdEf3OlY.Gsym2znKLZRl9RmXfJiXdJjZtt9THS3_USoh_7_UlcNPBxu2yw.xkA1YqvLsl2e8NyUZ0w1vOw5lZIcFzuqiuYakMJZAg5xEKk5G2gn5nLrVKqAXzm32eyzCZZt3QKguNvuqbjy3GS.QOddjuT2T6uoA6boWa2lIxDYqfUF2qf7Gh.nH8ryQ_3WHYr6Icd.SfvlpvHiLbo6h2G26FLxD92QeC9y39PByw6o4KG_rzQmYJ70z0ltkM8oghGmaNiR760Jeoq9tu92UabN.trz5_UxfjPCSp7UrmpPvkj.tgT07AAGBONJ5Itxv2A5Ol3xAUbVSMjD9UHYSs6.duoRQufprYUGDyBx_qs_zTsjLqsi.HB1IoNeAQBJqENcwQqVQos2BX84bXEgKTpgcsVwLIXFf_gGVPwtVfKDgfMOz7C5EFiPbg.FWSPo428Fw.3dsDSWF_ZzHZRV1A76uhJEl_XmaBAxs2Hn_Ni9anKBAKDuxne.uhnjVW4.Uay8fgw1VhLRsteu3tMX8YQFyT5os4Sdtrd2M86VaoEJbyXQ95JZp1xDuE.0Gnww6ozT4nizCPng93bfUqn9YPUEE1eIDobadEDWaHwntY9H_Vrhrjs1KYwR54hrbccovnBxMavCqf0nB_Oxa7amQEtr6J.vkj2wDeyWLmFGe74RU7ifUDVhN.fgj.BuvxGJdvSQg2nIfNJg5JA7M8MC1npFAC46tWTHKGPpGqrO3I8wKfDoSCH_wRO2DwOY._BXtdIrbcnmllXqGl10u0qR7wSdDhEXpTzJtDSxd0Ap60CnSOtnt_IFV.xWo6swH.9BfaxAP8xJltvaxwYlyajNuQaw5PCvt3Ph_fW1N0tn.PvIWVwVIMIvaJaa75bI9AjOMasSZJN.s.UidZKfWJxY6T.QbKLjfXIPqmriWhMvva8DbhFUf65EZI2jFbKtw5JZNX1puZSwRSLOnXfvJhtLAcUzf2UzNWg8IIyligD.g7adbhd8xmjrMmLPacmpHIIdkZXADOmmeATyrCUzFluj648r.K6HKDrGOhiuy1LqZMCIjhuLdIR5IEdgkMJ2UTMoIiyWswzAD.zQ0ulD7VjShT9xMhHQ_RnwtzlOuZOhEftibII1YNIkBe.0eRJORTmp2tTm0GfivfSfPJHD9_mqUnPztT2MfyHMVg7LTnzRA1HepumQVkFUPPTrII5D.uvZD5lDWfa1zcdjE.AQ0OUK0S7P.VdMgQp6jCpoZI83rfL_X92cVnKHOh5t_Fx45nWRxYgkfARPYuWLJNbCVzrMb8G1W1H_57e_IMHE7d2_xgRByjOys0zxbGjRh_IUpBF89Npkj93uYHZFRKTfP6akp8OtESA3J_DElJ7EIOdjlg_Cq.28I04XN.1n9aZ.tQmY95rlk9fji465He3oMXJiJmA2ve5_MD5ljjDuXcSGUJtE8PwLzLTnEEcaPrRtCraoW1MFWvcph1v7cg0sTseQgRSSRjXgcOlSKWDh8j3IUDfxck2aM9LPHN_f83S7tsdLuNVZG12CVQcROXR9KAsPj.yQxWT2dkfVXoeLPcqtMOp_PlpJu.FcjJJmxSidnNtTMI59aDRLysU3S8b2rP4qT9wpCU_5ZfnEnM5lqkuYC7zvIeoS7NXDhS8o4yjwEYAM3mJFUQZgDCh6hJSqYEMhhvAukFvrsu356kX4yXkOXMr1igDjompi_KgY5Q5u0LaCH0wSAUj8BvrmyWVqzAU.9n8zjkNIXDRa39Iv2bJjj36hEE3sohscd8cyYDxBB64FH31l4VET24BYrEoea0PfUW.hGZ6yW9Xh2q8Nn.vpm2Ahn6.JpAUq9fEUpq6xLy8Cjqm_7iByBg7GA",mdrd: "7iyNB6PCEWZymtOwyCV8._shMJQOyvkjU274dlmN6o4-1739231229-1.2.1.1-Z9Lw9XSBfG3MXasxMrZ0.eZ4h6lFt.yEBc1RlvKdWoEmcB1XVH_bTgjPOPZwmOUJbebn7amXQypvUlpNPN8O71pm5oc5CSubct1mHFmdF.6WSal5NaQTHytYxXYZFgjyTcvKybUbLHh7Nap3xdWfywe3JjXuYILNlckWiERPqX9ciELcwBR2IE8j0aEnUFbU.CaHmL1WzE7YKjsIE.1an8n5_sO2RI6iW76TCL_.eNvSlwR0TBO41zvl8YiY9tpRuEaLuhL9MhECpev99JEsuH0bUcNyivUuC1Bgxy7Pkwfqq.z_6ZnkSGZ1l.B.sOjVHZELCEngwyFRIvHfA.Spw.w3z2abENuMQmGKVmzYmk6iiGq30CcGUQQUeY9kpRx_kXOsGZlCNGJxJEgXumdCZxoj7XJ_vfSreR7Alm3Eq2pLPP92aVJhFL1qDwFnBzSSE5XjAu1XnC5pkNf9fGc0VbvyGg7TY7JFKmYgSLo38ho7g32w9bqUepnohq3FwLl6HCn3Cq36oogvu1kccpfExRH1AAkPqqlcsV.LMWnbaay8835PuFR6FoqL_v8iOEoFEzTY9L4JxAbxeZPJz2GZXK2cuIUEhVc5sHrxH9dY9UASezS9z2OG1cfub1Gmv5QzIJO70R3uCe3VRtIVt.338ZLelXjaDBX6_GGRYYTPmEPd3vEWr_W0FbLKXnUIVAd0LmSxAGHBNyspjB.LSO.Ci97ooPrFNmEjcLyP9JRg1CMFRzuyrc3mV.GN4G4vKvNIsOUwluiKkIzSTuwJRK2nR8vnrkoUbJ894tawaSsfk4F_nRuOdKBTkd5iG7CMLUNBR7dnxdWqdtutn_KO2U8CBW51ZvyPnqXIzPf92xKog6kmSa.Rhk3cZv4.rc7gGCd4_9E9iRnNw0XbVfrscekVIpy283YmD5VMUhKZNmMbFBDqDgx0cqcEVQf6GZES4I019yfdrz5rsvgdOlku7p8HIT.4RbpY3a2kn2ArI0wo1QYqdqWNj8dykRix_E8WJNWSi4bFTdQ7D5pSmnUiyN0uFVIzhVgX6iZUFTu7JD30Jr2tihWaOShfYMKX3KDksYbggQy6li4E2pv_hmoMXw6oTenelh4OwDXrO7i5d1Zvo9s_HUCqC8DHeB8gSWZWIok56p4O5tR6JsaE0jZ0km065b45ySunbd1qGPW43_Xu3KlxCYydCcP0Wv9rN96TwVp3ouR1KKyf2PyuIsVZXXPEDGLabzt1IvY9fA5pKNP70YRaH3NiU.0tQbzxzwHJFeC_EQmoTogwYVAPcfoTuTwAXVg3Tmcgf67us9X9eeIZXCHiXcsDXZJio0rHTnI8z8Oji5xBMT_RHeJUT0d5qOBt_YKT5S60u3gGlT2exBgdyhGFvG3Mir8FmJyowQHzzXsSd8o7MKzc9hxur1ahfjQrdbCJ0r1BTJlra1sRRBqTexFALOEE45S3GZV7ZghxSzYsKOpeUaIuReZ4HigN4XWrrGMAnKZM2RXuAUyhYTTOPRpkEU4jM4YbR4ebkiAhV5cOgrEq5dW2aO95CV0Wmme7ePsM2ZKUOcjRkN1odItdr7TfGLMfn3P3u724PjyHoDNQjMaUEotZFcPnVKpULj6HXbpvDTmiLxtI9cLZeGkYWY49wZSk12.1ag5l5ebuDnrGoGLFlxIZQS8xlQomsOG_HEVUdv1Hi0LU.rxyS3f.PBH5hF.Dbq78Kr0tDL8JFSsPWYQfv3adDHiDs3zQYem4FTIiO_L_U3ZHobzUSdBzOJQckuJa5zkf9P0hfEbbjG4iwCuZVvWNG0PVTZJhil_jdv6LqPde0FX0hoHe6ex1JfmaCjNS7OTLbpy7qRx8kuVc"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fffb913db8ef64';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\/715398735060?__cf_chl_rt_tk=AVJ3CXxbrHLpzHfBkq.6Bb8N8.nAfVcC9qULQ3FZIwE-1739231229-1.0.1.1-IQcBBykI59xR8BUfPQkeN2uumvn._nu21nsU5dX2LMA" + 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