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-2713065948-gov.caltech-edu.pp.ua/post/4735209861

  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-2713065948-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90ff136c8f9a2048',cH: 'sUT8nk7jpQAyczhvtRf8nycrbi1zCa3uTFL6F70bc3E-1739221721-1.2.1.1-VtuLUETccVH.5x5dCDdhlNmYvHSFl2f0VhTgodHYSX0_lxfqp63H8Fz_dY.aQoYn',cUPMDTk: "\/post\/4735209861?__cf_chl_tk=HIw7DnJ8w3QBEaifCydl2V9HNlcXEc856TvGkAmfY4I-1739221721-1.0.1.1-KfkQpUckvtB8iSJZC3HzWS5A40UR3XBZidziuLW79aA",cFPWv: 'g',cITimeS: '1739221721',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/4735209861?__cf_chl_f_tk=HIw7DnJ8w3QBEaifCydl2V9HNlcXEc856TvGkAmfY4I-1739221721-1.0.1.1-KfkQpUckvtB8iSJZC3HzWS5A40UR3XBZidziuLW79aA",md: "T7vGKr.w_PLCXQiy_vG5RSWT_useJpxuQZf0Y9aJLOw-1739221721-1.2.1.1-9hpoCif774q43cCofiGv24mn.Hl9aGUEFCzW5YF30r1ae6XoTzMCyuRe4hXMJVfQeN2oi3N7HnRhmkE2HHjXS1okUjvyvaOncumDPAB1y9p5cvX5BsB2hyL5PcDLOhuPrkiaHY.GOkcN3cTc_y7280MFN6SgWT17e0bwnD8iUbiIJjh0YgVspfW1jRgf31OrBTeemyqlXPkkLr718jWr1sV4AKpQ0dPyHS7mpDqH8g3sUL8oXLp74WnmZWXt16z2HHaqPadsVo6LSMzy3yrzSjzDid0w0S5aWH2crIWDXgAK22eN63bEwH0Db65xEGTs0_GGgq.xUKLUaTnT9J2HZz3x8ssMwllcbNlTieZz0bZ_cd7rdKWE57m0Z0YydCNNnE5CJSENvK4qyJD0vQXjSkvkuaGacvIOBBaBWSVHQlriCsT.XHOEjFTT4yotKDZUiRfAX.duA2lmoPUQlX1fxogTQl615m6PZJ31QJrRRLD8aV98ENkMm_vh.U7SfDrbkas70ZnyeXElZ0ptYeTVtalHhE42wKBjj6jWq8sY8rMih7gbel9EqTHYUD2k623ZKOCsTMZ5RPFKx.FI1z0bNqkHuPutBTekJek6o44pM47eh8rTXBtzjjUIJm4ZK3S4ceSWA8eZ_mVPeGwJ0T1Tm7qRef8lcZQj4PHZpiunDUTIrytm6YR.XJN2yQTBmG5M5icePHDC2VmZpE9.fASI2tXKsj3SHi7ZCzO4NP1LFUk_XBSadoj1k1lvmm4qUCaPHxVFcYL6UlFzJp8..aXKn1FfLkRK6vaotz0hEXpMv73M8kzlWiGZq.8lycHUsr8AQ23r_JixYsjbfgYYqEM6h3EBasEb2SUFQU4ZbeL9ESqnc8Q5.AaXcLSk3LEAIkxaWgdvLxKVa_27bDaF0AtmQY5thUIlmq5Nb8gob5mzlrftt6pqoqubyYAX20PUU7WLXU7I5JBeXEynWFh5ug4ey9BTqitnfN0PBUPTkye8phKDxhGoQNqHnETgsrCdKrnqMmafVIEka4XMbhJ2k.rA1AvuWMAKkDDTOKdpdoPxpX0kZaB_CNIThW_JdjuUMqRFLt1SuNI.L8WnvZhlOUfS3njGdQhsRx_8rGsG_pLa3LxUAnCQYaJ62SwK3SfMTECxfJ8KS7VhhCV0ADYcQiGrwFz_FhmJZSJGh0BOBiSTmIIlcjv8OqLxUBtWITcbrROcnIFEckpxdnGs1PRIibD4C2Du85gDSiS7iNOUk8KagYD4QSl3MtObXe6nTQI02wJZQg1Q9uQp2jzR2kZke1BgTXAb7yqZn38q.PPvprfx6m5J21qajtrhO6JcI1P0dhoki1mJ.6K1xsFzm4xhx_ap9iU0tdqCWcwoplnwmOaTX5BI.BWQlWsl_e6dKpahJObvhE567atqhKxE8Di42YKPnAB15bg3q4z43MQRjaKhqhhEl920LpOk33prGce1GEs9HhmB99ATs_mWARnA4RKdu02MBFcNvJM396d84Z3Za4Q.2tBu_fe2lVJJ5RVWmRbvPys6blKbpe3nOFZXFEBQazNNODmBEah9H4dXVY6CFRmsYQ317TKJjTrJUafeh8dn3KCF7XASTaAohQVC9oSzqVc9m8AeajeuKWBGdMbURyNq4R9Kqiz76lvnB3FQbgU_eUzxofeRuHWJ3BNAsbPRPbpgiITS.71mGpdmSdv0bf8Tbik95H0ceS767Kme9wVUeiMy535GuQuQcrr1OLdJ1wVjFbzadu0HIqfq6ZmvaEeMqUYFu3oMuC8Y6m6Uh4OJLeFpZJTsuRdOEt7ZgEpe4eu8fhsyoqqjUzQW3q1ySxVdnNzGKt9A3QTUJ8HeIfZMG7Mklm13cnsSWT8NBCXLEntZQCCiebsjVCOAwlit7Wi74n.Yp_7e4gtgzni1uV26VW.gXzhgOi.GQncEBRDQht32dAXTVrKxhb0GDkutUd5SB92BW0d_XJ7BysBkdsr6SLvY5kcGkQHYBViW663sZIYWv2dDDvMm0yKt3rlZYWRA6mlW_vawdSkMWhD5ozU6X6SxCepbW6CI.hrLGOBYdnSZmUKqt6j59BwRdwtS5hsvRx0FPU1udsrmLGQVVZb92bSFVbZzwfcFTnk6Plzgm8A6DKPvj4YhwM_dGehs041H6Lj7Ys4d.I4kkUILiIlMWaYbtLsjMFaTRtZ1qeGBPWoCKywbYzfESgOOht8e7pjON6UfqEXEh48NOzVkS1h8L0UtRcnbUJb.zQihVULNfA",mdrd: "fs4RwDw3jBfnGBfMZhnyDIkUmN_2f1rzht706MWM1Nk-1739221721-1.2.1.1-sTIC_7k_VbUjNBgCMA0ejLnGeT.qR1K0A8qr0xE8ocjob4OzEXadlx7Y9TYIz43a35mIT8vDCdOiALXAhSFwOAXipAZs8avdz5t2RGiOUbkAfiSWvL36OWEC87z6cj_FXC2XF8EiFvLEyxZb1slAbCjImdH9F5eFEtXlNSU.wLHAWCQJ3XK1LMcALrzIWntWfTN7gFmc_5ehDclLRMxXH1LREknWHSXZP5sQ1JX0DPDNVb3e0ANedpCE1VVPPJpLIwMmd12WSjzBS5MrCCQR50Z_tXLKemcR4I7TuHlJedWHtUMxOOBkBBIIywZNy439N3BeLsHJX3wiZp4ds6VgZKZm.WbnqHtreomwEM5Zbe6AIKFK5aHSPliFLARRoQ6o_.bdCd39GHKZnOpMqYNl9TcMNZ0IQB4HxQkkiecHe.x3vxP_5AXRIriBjiUP_5gtqN4mvIOsouEK9MhRiySxKR5J2BKG06qzS9Ly9um.sEpvESBzkIkPcKCgBb.uGcRH_NOGQgqkw92EjREJkuMhw19rP8TD5b.fQBPqauTEn0puxeW6O1qFG7pMM1KiiXv0NDrdtrxkBQtxXfuU9UX1IiY84wK5CfywUCFoaWZnM1s9cUXT2Qko1T2Mt8tpY9ZoMFxSzgXU3AbY_vfOlNTULhGMS9fl3C.LcxWkhw9gl3bJttZJ7IoPI5sQ1_5lWjBtgapD4LEF9dHDrQW0pxJ_lzjwX1QnnDy86YBnvjcXQHXi7gr2ci_wplJgr6cDX3a50M83AY0aYlCwYDWvA8jzF_y2pDxwsX7oiK7_FeTSql81e7i3SlrUeuHsmqi0skui87q9LPH4ZM1vjvwzeBEOa4DuBFsOIgYE4HnzHf.CmhmwwMJIy0YiFHXNN54x85l0AXDO0ZNvcD77A2nN88igpO.Ic4weH4ixTSWCvBpW_9RaoSVDRR4sV0AW3pUB39RkCwyL4iQmno6e3bA.4ED.SBKOVM9.ziUH32nltVqCP7UUlP61Bu2aXjztB0JWjFMov_w5fU1SGoEeFqPgbRqTJgTsKbynNOdfpDHUsAhBtL9tbwjjRDHUlYV26j3f7UAGAtsjmoAX3eqjHEGFXspveA5XRBiUmgHm7WJg8eUi9cfwZ3UQcqfGr89bobEIxxfGjf.h93rIP6Do4tTdpaai0L2oyASI7o.f9pKpkBvptSbRxZoB08o31b7SwIBTlGvErl50jfdQo8ZMLo8qIin_ZXkU3L6dgaLmW_Jb27ekuKOwMMk.UamzCnbxWV8OLnLkjCwprZaWn35eScJ4HN5Cg8k9GQcKgg8Oc3hBgVTsHlClY7y68zRV3LZoo7QI71FIrwfCLSNZ18v8tRJWH7fUqCZYSlGg5hSOjJcBET8ENFU7jqFvXOoNxqzE2xiDG71032yydb35W8Mnbm8uX4ML.aLz2qLDyhFTP2S0YJo695ELA9bDWJI6DUwqQ7NNMR4tUNvDt.HJm0TDfVg1gnkwn147l8gWukAC7LxQFQgtu2uMX3Hemg3dZlPqcXTL3410MMBP8pK4OO5HRSg7awJzqRpIf6DuPDtMJE1mB.a3YZQbcAjoERE8Dh6e_9cWhubANjFnGDhDu_MG9YCyCarkNUu4cIsMrkj8nwqrsEF8k5B2zX_Bh0dpoAls6mfxR6mO99GB64WCwAC_HWPh5_v9VYnfbJKMuAZYgC0n8z6qG__bwJOZuRLvPci3Qcch5FmRkZzzi086e8XrrzzXvHfsFFOenOuP5nu15.Sjse2Rzt6x5S34eGWu7D5h.0iOwkJuBVuFqQSoA5di_Yv7PxARV3y7Z02Q.6SpUnFbh4LQY5WeKQOaKLnIbglWmUHkM_07"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90ff136c8f9a2048';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\/4735209861?__cf_chl_rt_tk=HIw7DnJ8w3QBEaifCydl2V9HNlcXEc856TvGkAmfY4I-1739221721-1.0.1.1-KfkQpUckvtB8iSJZC3HzWS5A40UR3XBZidziuLW79aA" + 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