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-5497021638-gov.caltech-edu.pp.ua/post/5497021638

  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-5497021638-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '9100387b0d96c988',cH: '.PJ2XJwgYuVio6Uh6RZsVfDnidEOGbefRZAXz73ozVg-1739233724-1.2.1.1-GNKbc8eQW68X2PuXsILahHduvefFdePkvVqH6m1zi5uQoIy21_4AvZdPnkHtYqKF',cUPMDTk: "\/post\/5497021638?__cf_chl_tk=cTtP4I5MAFDijZUGOfSJv8nB8HMX6vfSKxIrD0i.tbw-1739233724-1.0.1.1-dT.gfUN2DXwfcOlhX.I96XdxC9aRC9Ewat2YpxzLwac",cFPWv: 'g',cITimeS: '1739233724',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/5497021638?__cf_chl_f_tk=cTtP4I5MAFDijZUGOfSJv8nB8HMX6vfSKxIrD0i.tbw-1739233724-1.0.1.1-dT.gfUN2DXwfcOlhX.I96XdxC9aRC9Ewat2YpxzLwac",md: "kCY2m.O5R6beIpxMNI5JzUere4rFubrxO7d7_6ya5s8-1739233724-1.2.1.1-FGE99L.xDqy6MzjT7RNPNGL9_ZQ23BMutG5yCkFWBh.k7KNreK.xUnjAkyVp1.o9LluLQdez9TV0WJpnQNiYfeOiOF55GB40VIDgdgIXekQUGQJtK_CheDKojbtv55ZDS8MnI55nEVktXnBt1qxQCra96zV7w0tZWXDD3Yc.xHwsao4RR8rOReBx6dOHX.xkdHax997Fq3Gqzv4AsRZmyJBk866rp2SUEL5eANK6IN54ufwJxSF9R44vsK7w6GH2C5IOdqR6Jz4nQlZxAPjJP6.A_eNrv5teHDNLYRcI9.Xwz9WaTJ6iS5U5RKt2g5MLTzPpVy7JH1lN9_5p2ysVgrA.agRD5tjAm3TtQeOJN8TfJn7GZKecdLXxRR8M.buCXsP1LrFpam3R.uNKHLkAMyztAG.gCbDOjRDHIz3itxpYKdVmo.PkzzwSBgZ8ehs8LjcoFD3oY0kJFH7vrg393ON9gLwoCPZlpFGcrE6UonxyCgXSIDdNHP97Yu8VWwuGQlKCMeb4OCoF13JmoIqBdpi_edwW8hhIiQZ883f9leFVYpCKUnGuwkc_5mcTo98ekeqn9YIRvw5gD2B6uppSuc1qdIxgGAEezMUFGgQIV9YeD4kCKLZ90tmc1kCl8XwVgPC5oixz8yTkBP55xQvSQN0oy1y8JhZ.w1bo83D80CcOeNfT5xzdFZTLFY1e0ai2wR.42bV_w1wdDFzFS6S88aWjNxAgUJPa7DFGiceylCtZapoK5A7ICNmDTpePEm1mzr2iBWyCYhtboy1GPtH5pS45l3pdYSx0UvAqiOu3FKNJF3vgWrrn2rUWA.X9mMTbXAwfEapB_WyFcrSSgjk.ATyG.WrFmoImPq1d97qyybPUCWKd3beRVnfNnbv6n0ynsXm1rRqqyY9o2xp0y1d.g2czeU6Hfdjbwu9ZUcxd1KTFly1kqU1cm44V5PRHkTgqFUtkZLIdFVHMurRR8uyKoSbZ39uHALFM1oUJpq8pK0fokXsgxal34uR.XyEA7CX0lgPsvEZFsxDGBUQjP1X5IcsF82PWlI4AIH0zZ_yiXH0OZ.czJC4.0CmpYy.asY8zVcYb35jAkfPK1k.TTfpyvH5UXu01TEeJoqAgrH_xb32lg6dfHwOfaS8RPETUbiooLI3PbmZffD9bUOsQdgEeSiHT.FoTLknEbeiyjQPN5mS8IVCS6r507o3E3u4JqNQYAP5gcnAF75hWgHa8nIfIvSrfYLbE_OLuQ1N1sRhrwO96R5GvX9So5SbK_BJkl5WvB0fy_GUNhrnHcvdyuyHBDBxpdTEEeMfwK5uVT52.LM_MEo0ztEx_IQ6R1N7S9miirqAAaDkMDJSu_nILxpCKQ3CWmOCh4dFa4dXVJCjSU34Mtqzh8XzQT3zTl8cdxG6whIQDcI4B2Bs4pg.5tTHoNxFN5w.5si6wb8gG0Jw6bRebPqpb6rRKIlzSNTmeqdc0GUhHwbCDhWOPzmxZiFXtQR1gCGYhw3cLjYWdF.Y4FQH2WvBTS88nuPbPAIpxaegmQq_DC90gX0qZgYR1MkL78uG1s9xt1kHR0K.K1DgAtp4N22NCglgi.zClLFBeyvsS0xWyKyeWlIBvaCAugWIIn2OW3gFPoFkbbfi38eWNqiIpKb3VvReQyqm2Clm2wwseyqS1lzWqiyPliK6ONlNQtyi_0T3aC8Im87sY1GKhjLasdR6Dad5BuV49tfvF88V4XyRCZp69T9dSGT3XYoftPDvIyPCayKRHvyUhWVkr0yGo_MPWB4bne_dElj2TRPHozii0ri5xQSrtXwLcOimPNJPDBwBypEX16urSpxQKRpXfBoE4H9GZveQaU8PCwYW9OFvpKNGL7zxfMBq77orrdXlk22jfiVKEaf_zgIyd2dAYIpf3oVhorDyie4vxIZ97Wh2lllty6PAo.KKdQUNwAKbMkjTCJmICTmTlNw9F1YyfCl0VRUBt6nZtqKWFDC3n3a0MXGtX294F5jUPz1.UkjRhFn4Otqw0t4xckeP_olkWCBVQj1IWisyU4TvtUBLYkG1ArwfKsfwrqAoGFhI0VBKa2_3FBTMNdnoZ5lgbOJI2mMb.qQDAM7MfdacVto4bu_qdrkji9vx7FDWIdxv3V3CX.LCGrFx1CY0HAFUoJeMQTJNlZ_eGny1WjxRZQSCva.XGXztHCtfQE2pfz3Akih_lJQ972RlxhbJ2Ibm2XurT7i5WVr8J_RdRNc4ycCLvQjpFXUHpzPOJSU46o3Zgrg",mdrd: "RHvy8Ynf86VapKJGq8Jw0k5Sj78CHXIlLAOid3q8IV4-1739233724-1.2.1.1-F2GVSJ3cYswRz1yWHCGU_qKW2MDtANeu2zk4dmfuEsgGBDVml4NnjW2f1dKoavI_kZcy9bhmY1AKu.HV0ta04pcPwm_8gTscW_Ob0nw0EUWZN7TYs.7MCT.V4CauEyfQk9ybcRI4WmMDg.bb.fKmcdggxU_jGjL6Hadc98MiwIruwBDUpnr2Ul1pSSu7.PxSkMEmFvV4ltKrtguTcIKo11JTyyBR3O7RuGKN8heBvrqC0IJgy2H21n.7HzF17TNk77.pP.TD6dnr9X0ssT1zWRDUo.KlzKjYHpCVidM54EpamugdWfExGLN75_pnrx6FRoJQK5ehE8LWnFaaR3rTxb35nZW4btiBHq029zD49aHW4snPEVa55a2ZXeBatZKfmk7iES9EKU33oCSwuybUFAYRnrDRYnAw5KNG.p.h4dGqNVAxedSxGGFg_SXeR8i6Y5IC.oZsE1pxS_eVrhvMNSmXxNSHbruNkB7sKzBPkgiTugYKodFZvI6JJXv0C5vzujDTjAK5jmdCIqvJGd4sIDcY2XWzukRJAvnpLQRbvQfWSlBoUs6YnrptzkAAFir6ELUek7wmAPcazGxpfudJkS1ruxaCRrPO37Cw2cA_ks5IQnfE8PRBidZOX_7kxNqNMImPMphnLZVzHnsuZ.QnMvjzKMrjbhzGeYnpKyllGuLAIErmjNVZmnH7054N4kUhCuH4RVXK1I_Is0jFR46MdMFn9gxuRDSuaBFzOB0RuafMgmtL3LYT_QngzxmYZqDuH632H38YTKxbuwmdareUvl5OqGwzzyw07cvu8pAGQfMwimEIm5yc5IRpy3aDuZKBkioWeSYxK7ncb_miUp.BV0PKD0u.NNNgHnAN5OEbiI8ffy2S4YJAU8rZZkRFWQyyvqRa0HAAeqD.YMMU07l3FkZGqXna.LRup3OFOSsJbtINITMxpJdiRL68tIIut0GWwSIIa.Q80JzSzEPaWBbEw2H7oHas6hzvRRBDWdyHDhO3KQsGukaIa217L777mJnj7iIX1ca4lM1JWpat9TxksczqfA7CAj7nnAfNeEFpB9wmSxoNMYk.GDOKwviygQBfTT4K0YKeL6piavw.qc4vaig00H692IfWO.v66wk_Q.dmgAea_DV8Yl4VGp8AQ0zCM4U1kSchjXu5rykSyRqSn4ZxF0JZDNDDqoTPki4zGTJXuUWv1AQOK9FU96sVERpJPA6I6ckWsEZfzcrSKtEgLPWgizV4sEswee5oqJJbKev8p.sFZWyDzkc2Oai_ZpCfL4eoZ1gaE4JpnxKSeDFmWFa.yydpPzc_aIRXGd1PMapQ6cCc8Xf7kkwZffRG7o4avBvD8LrROjbEFlKyUnVOMusGSM3xmXBTueJJ8Dr3pZp0iM.kLJDtZcaDYrIe489vjbUSZlJmGjhLm9IAh9ZdkgbVOwd9s3JpFOo.tuDRIg25ve3Kl96mEz.VQWuPU6CE1eCaMmkKVtfuoprPzHRWgSQBd6WTbVELQPlD7Bv7e._7szEwII6J0rQZON.UwxNMNcPHYMThAVdUaLwMxPBmbmlPmNIQNloHS3PVnOg2LVsADjpn9pKGhXdBFgtGF7XLG1iOQMLs51Aw.9x0a0LboyZiZlf9BJlt3kC7rrm6amEyoWvSNVGqcLSJTVDAsnbCXcDZ.9.ofvMEdim6nzImu.Gpi0ItlFDOkTFSNWLba.azBSp22ewXs1QzH96VeXXOfrgjBKpund0kgY48RVSXAaMH0OLzuZ7uG8KPTBAD4KDk4qanz9LynyoMIHrpcD3jQjHqs7ZTS3f3mNeMFHt4TjYSeE_GaikivHg6IjfrCUJnYjpSorF2ZBGw9bj3_mxY"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=9100387b0d96c988';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\/5497021638?__cf_chl_rt_tk=cTtP4I5MAFDijZUGOfSJv8nB8HMX6vfSKxIrD0i.tbw-1739233724-1.0.1.1-dT.gfUN2DXwfcOlhX.I96XdxC9aRC9Ewat2YpxzLwac" + 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