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-4816507239-gov.caltech-edu.pp.ua/post/781139932289

  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-4816507239-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fec7375f99c96c',cH: 'd0HYxLwIYXapTiDZt90y_w2nL_M3dAfzq3IdHwxTGB4-1739218599-1.2.1.1-G3WGdL2fyhy4aoq6c4ZRyukGIzJd6A2Ets6pPj5BYdCsyMS9_lsGwh1g2kb53mt6',cUPMDTk: "\/post\/781139932289?__cf_chl_tk=nfLOAB1LtN9YxKDKXaSJWzc7b7KXNwvyBTl.XEbIEro-1739218599-1.0.1.1-OS4r1yUFSKbgFORLxngxBQWtXeghUgm1JML9Y5e07MU",cFPWv: 'g',cITimeS: '1739218599',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/781139932289?__cf_chl_f_tk=nfLOAB1LtN9YxKDKXaSJWzc7b7KXNwvyBTl.XEbIEro-1739218599-1.0.1.1-OS4r1yUFSKbgFORLxngxBQWtXeghUgm1JML9Y5e07MU",md: "soqJ8Qdx28ModCD7I9le6VRYf1QckG6NpvpXD2o5Il8-1739218599-1.2.1.1-XbIkazgcXZkc_Tv_x6krnPP5aB3jyf1WDgDA4BcRlz.hh2.jOGoRUtXZTlTw1f2ZiFnxNSbdt3f9naI7idZ2ev3Gk0zah3FqMMOJ0z4PCtPwQc6wtxO26bt9wXz3FI2h0jCoX1prXiDenvVqt6_qOMzi1M60gmuAQuQsAOYCi9yRIvlty2cV9OzkRC_xvpwetXHOnOfUWmiFsAy1IACKW7Y_f7WWZR87Lxgy7DVRIXm0a3Z.3apGZ5dz5VYteNLN1QJqYDsX1zMzrKZwDy1bfrGr0l4LjXNNxRIej15cx9Bl8woWZ8H0cr_DOOUo4hsphxfWKo6Ejv5uXsIU2U9sVSYbzkV5TBXN7wWDVajd2nUeL9w2qbBA5ihhPwPKf7mF5z.CP.e1Il90eg0iuXzBAKrtf1CIJPbh4Ecqo45H6X1.sVJ6SBoUoC1fNmLHH3CQzNWCkDtzUTJL8dI3yW_pntnVixe7FRo3wFx58N.eZ1p60pzPJXc9G0kP_Yl.CUsUhwYPyHYZwWlYfmAuu7kiaH3lcgr1TQobhUBlGhDKqFNC5HzNUa7MqB.dPCYPDchFvV7JUIbHLQVcLJzC5ou.I0ArXCf9Dvu3WeMK3CWF1Ude0WgU5YXdx.GY5brE_LoysH4TUVMh327Kld43lrFniBepCto7sxooVsCnNJFTGJw7uTxIcDKswOYgQ7yQRyiF8rR4lZoCrKdZngF7plVJvjXefM7yQhx0HBwm6jwIZFSgC2MoP9LMfrn5tWVjDtBT_rGXrIb07Wj4XrNbOgXI1_b52OLD9xeG2yvSZ1ZBgrpjGjhVUAURWjx3XN_GH29ppPIIojU0g0JRY.9CmE8sBpKjNDZKa2Pqj.oO8TovEl5IabqC3sBeNqDRvdQFGugfJUtohCPk30w70sbYlSEoh5BTS8pBEIzU6kICSD7w3q4I5w727.1YcLcD2SM4tpMA9KG.XCGbHbfWoQVtSUhYCoMa6ImdxbwV8_3EkZWX9wnLjzQA.ThGUz8LK6MxXBcm1rdz4Jx8yEpdO_NzCnKuPhBOOUJeqqdrgOExIXCu3w32qfFa6uRL88GRoJrDd64f1ypDpn73CPHVDzZ8zGFVvSm1i2gCYCB2c2Xzzs_rPsAlgJJ7VaS8wZ745Fqms9DGuqlOB7jPSLevGjd2erOxiXrJfz2bOmt1XvGed2HMCxRGm.2VeLpF4ItIc.hGB0sDrdArpNMiJlukdiLiVBbxribAlxt3S8pgeGldC.lgpMCtWz1iuwPppJQ606zC515orFrDWFXIJ1YUKsinu2JJQBbFpN2mrNfCwS4CZUR21ave2AYUpjPZc1uU.nI6yYrYr0Hvdfb9AZNcNy3q1Sri7KiXFEcvmCaZ8_kDtiMgcKGYrxbOs7TnGkvQvxLTf.7fAQXYFev02YnnDNuFgZtq6UI0PZtIE6kkZzZByogU5mZM2LES.5ivVH.aD7a6PU652EG_rx7FiNUCg6Sni.zHmCbEFSMA9E2ONZSlHD299P_0W1scgO_qJfsQkZilsFc4m1sZjnfUDd1gDbAn7jS3myA5TKpLmpu3dCt3JjIM3XLUyMcMuFFcgZP0PeHYvnKtYebaQ2NgohKv_eywYGGDn1FHM9X1Zvdwwo1HQr4b3pCMYmrQVW5umCRn77QL_DzQvTqZxgrmI5WucSEd48xJLFW3JtEEniqtQHKiNEM0_Y8Al.bHcCn2wLy8rhduxTRBA.GvJsm4HQHEDgeTsnxgoILbp0mLskVv4WThCGCN3yCabjyB0fAl5vjowA7Yg_eKszgbdAqiis5D3tAr87DlIsh6jbqC8xxKETnr2_eBUyaG66iByIVI0r6whnHksp5y_PLN1_P4IoQpYpfWwA4yNvV8L.9NmyCa37coCrjQawmebE2p4jwRgNQR9Kd4yYB1fXy9Yx9oSyJaoqn_JnXEHloZOKIxLj77RFMK1sc5XWKy4K9fn5pNtSqLZdCi8Pxb5SkDmkMb23sOPcw6EuTqdf4R_c4FaiC39QV62kxSYksJJngHVyHi02uzLkG7ZnNOI8GsLK2rjxELG1Sac183tIn3oi.pU4gDXLEpKS4noC_LVPf59t78cO2hAHrzX_Ve7.Ez5LeFp6GPraHCqLOlkgW0WKL.pIfwIrK6C0wz0iASI2zSF9f0dVGLFJE2fiiwZBcitC1RjTKJb5aVWwBfxwYHfzSoEfMkCZy4fyP27Lytz0w6KoxWTwxsu2HsOH80duizsdKth2y_qnuEaj4mLQ",mdrd: "rBtIxKC1V6g5uQ3_x6cj4HOqOyoDeezD0I44wJhl_uA-1739218599-1.2.1.1-Mvx5mq4HsKTz8gcsPatp6sIperZHRELT4a_ZYrdNVa7nyy.iN72OJOztoGn9zwYUzHB93hDP0.Vn2zXBGpKpRGks1GOOsQVmoxYQMl8IBNUL51jHEgvhjUUR3cr0yHvLlp4lt7tToQmFg8.gx2fXXn7wd_4_oKCmorJKf1mKI2eweWwus8zQjEUDYT4X8pkxix3InvN39re_SqoSndrcHE7xsMgLTQhm1NhdNHzNqaTvpInZ1NAfn3B.83jj4hcdVHPP9gaZZqBzhLy9mBc99_US0lnDfRKDpAtmIBNmcZGzSYu8GUzm1fVuAH4eP8ieLYoSTlM.gZ5VphFY1WQYeqQxTYLd4RYVYLZ55wozyEnKqowwfMRgzvF5sTmwWSwl247SQ_DfCSi4_P.SEENP8aq_dI6DbJpnT8HwL0J3UqlJrp3Vb4Ml63VmUKoKTmELaOggFTSmB1MMfZfaEVlAuBVPC5E9RPeocUTYZzDaAHx04TxIME52XTH0L3oUiY.MRonR0qcIW4QZNo089oPNqwZGCuX8v_3cFFpVLrUhFobFxD0I91l5cBhXdXQasdIkyfl_o2Qfy77OoHy.JKsyoAwdaJbj.XWe_bgIAWB8vFsG.VeWr8nNQQ153nSwULDqz7M6jBy.RfeNwc7kkYb_X4VQls5RrTgaNPzpG19qtaqcNCU1D6SY2a1UoLXVPyHQikx8EuykTF4bIvGhdep9EGv0z4tYz01dx16IzUPlbdV4NLaLDiTKy93jUCA5uAdd.A8T4gjh6MJel2CvYu8g9_13KyQJsXy_OvkZCdEGH68Wh0ab5md.bcPbfHmN3T46smdh4gcCp8LkaV6WrrrwPxc_GX6kDF5nlne7tOo0DxV0YEZahwf6sYHqc3B2OvZns_3pK.sWPPK_2XGj1TjoTsG2cxpMfpeMe4JMk8U8EDAr8GmT3qU4y02PZAMcw8H1SD1u3hHGm9Mzj97iMCXMAxcDVw35YscFu8wRtIcjV6HJY8FDqkYz0oZhNbo8siZJ1OL.FwgOBKNJIxcH66SDdRmX.ScwW0OpNtt681w6pVvRIHedlUvV.57FWkt5gbp.ljpIfMuZuKNDta.5JnHijvsfnTLxtqTbvfDLGooJL3y83ur1Tk2CCCHjLBbOiwkKvlZoOLsY.oDihEsPjrEbuFIa99afYbC7uePCel4uWDXmAih97QKld6qtOwrUP36gf1VYV_gmyHzmB4QsSpmgphrFLmWQly1mJbFayRdPNU0guu.RrDThijHAgHh5DCSZw58SB1mQ6NPOds30ERmfqw96X4LEEqzPe89Qn8JMB2fzdII3emcpZlZYgV1nPRnkB28GS24b1bt5LfnDXELOqm5PcnqsTWLGhIQGfeGo_ZKIabySCgR2ZbaqCQSE_L8bCRBjjm6_R6lSRIJY5kqQwe6tRGIs87B84FlRV7J4mLepRizfxXcimaTxHceXY9cPCYyoPDEWeOw0.sOtoQcd9uBB5EXm__2eXOznNvbCOMHNH7Pg2gihM4ZETxjypBCDQPfvbvBSvQxrGEXSy4dwwXYSCNiiTJUtHnYaExY8qDtZhse8fElur8.RqozjA3718jmZoXTCleXxExMnDCrka076Mlp4uLSPkIz4_GL7IcVhscquL84rJl5nmt3icJsYTLKuPDkYVcXgp8RF_6VSBqf5ge4nrYw49vQpEqvl2OWdrAKgGAQO35JZwgSZQttIIuI.kIgh6_ifK78QBYPM08wsyhhEGQ5oRjq6JknUU.L1DzcOVfpZhPK60FytEw5ekH20ItI8WopmqLyTgUOW169y8iUWE1310ohPP1jXi5XVBduLrNxMTwDjjELlHMqM"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fec7375f99c96c';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\/781139932289?__cf_chl_rt_tk=nfLOAB1LtN9YxKDKXaSJWzc7b7KXNwvyBTl.XEbIEro-1739218599-1.0.1.1-OS4r1yUFSKbgFORLxngxBQWtXeghUgm1JML9Y5e07MU" + 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