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-5927640381-gov.caltech-edu.pp.ua/post/339992205436

  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-5927640381-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90ff3e4abac9c95b',cH: 'HfuBQemShEZAm7MttgsWHigTWDVx3s76e_SCPz7ekQM-1739223476-1.2.1.1-OV0GlnDJBzyewhWBn5Jg34YBVtJCyXF6KVm4ZBFEYNCBBpzHgN36EzCGqFb.DoYH',cUPMDTk: "\/post\/339992205436?__cf_chl_tk=t0TGbNLumrRgLmWbgIpHPbxVYQOxi86B0T.V7ufoXTo-1739223476-1.0.1.1-ZJnZre5ZTwNTg0NHUQO9W0sZr017dedhZfalStuD0ik",cFPWv: 'g',cITimeS: '1739223476',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/339992205436?__cf_chl_f_tk=t0TGbNLumrRgLmWbgIpHPbxVYQOxi86B0T.V7ufoXTo-1739223476-1.0.1.1-ZJnZre5ZTwNTg0NHUQO9W0sZr017dedhZfalStuD0ik",md: "r09AFRCk2QeKmr92KyhQtEbgf429W5bpQ9KC6xhrphE-1739223476-1.2.1.1-gFDN0tqhLINuNSoLr2fruI8mPmWEnoXKSbVcGsWX88D.i78DMjFnCAvjFDZl7YFhLhy8wAxW3R70Z_E09jFBLMf33uhSwTvsozP_GYBEHqru7Q99nn5PhTkb_xp49dtJEqjIlL5kfRi6FHa1UYQuc8uh0VfA2_kpdwjSjAoK11RiwejMMjOLXECav.9_BK9CbbrveLW8WP94T9tpMZhP.Zuu_R6i33FgQRwsYwF7LMkrjZldCXFONWmf6SXxCtL3YvC6AswVvMCE8WtOmqnG7Xnutg5oUmZMvJ9ZjLQ_kNlqjgG3WqPDCYcm9WefD_s1YjvqkjqsI9TxW9LjG54kv2blL4UqmSfiPt3VZ519vdvFBZes.Ua3X3a8H50887YsG1XBuCV7ssAO3c07t9MCEVSAspQM.GmneTBhRwk9zlDWfSEzE4YdHFFoLnEaOeZOvYJxqde9iH_PgACnJV3iY0Hz1TCLjE1uG8c7gSPdHRvv4flpoZBhOqXGFIuZ1HpGSs_3vU7w6zqBlc098kEundqc7Pe0UHOX_s66TrzEosLM3NjwK.hHKJeJqCvsT3jNmqpqPPKK2vPSjdDfLIj4UQmK1kKsYa1kL2v4i5mYkd.jqod20F48nHTk.8X69jZWuzCjBybc_BZsUm6CMjGSUJlQb6qUt5VFj523OUeDc4yyD9D9fB.ve9H3dZqOZvn17Po3grqJBu9kwtPGcmNljcyfS4GCxZjLBjKnMPNlSeIxMyWSM0S9kYulz0nmKDg2fLoL34Lc3.V2ZC4t2A330A2tEpEE.31ZtehqufT9P6QlqLFPT7HgU.rNmmMPFZiSQ1aQRvKcFZIpWZKOvg09EoRqmBCf4NGtPMhSY_8KWOpnXokBU1tYxDLrd0zS7_cJp1c8ZjliKcWhZiUhcFWBl2e6y.h5k0IZPOJTNajLI4T.JSvSNdUnotuHXOpIfKT_U4FnABKAP.DEVRHRnK5BNpS2nWprmC66MD3D.c0kAcrlGiRGDZg2Zmn_nkSgEJ9IWUB2ubAqFDbBlD.hYV41bGE5zdEHXzjFyJiDnYBLwCP20PmyjPzAxVHKsDdqmXRtgN_id5lmsF4KE6389EKtCrSWRqgcnvhtCSfAnRUV8PecKmd4lFBJ56U6c6.pUsmjv6l9cdLYyRrRdBI3Z0vNB8xTbC8tQDVkfekNHuPZdFPzKDpfQA9gq9SW8cqznaq5UAdmgn_hEoXUeHTUt3oR_aWZScmRfcf5gwkeMpiKjQIG_3nlUVgJCERo6fx8GGrLqOon7JfsF3qK6S.OEPDf.FBOoBfYb3VJDTohApPgcxABFNELRWvHpchByeris0N.IT.9KrjfZr9mf8RdQTFUtdEMj6VyuueYH1ASkgcFbOZ6H_ybEdAoIq1KR7oRuLQ0aonjadx_iyEWNF6vF.6jWtODT8.9McLoWhDGsVZ2Oxq5knUCrxL8NWF_OuQ3D6bhBsfMcA2783i4L6kGxLEbsRljDVA7usFQVZ12gy_6wqKBhDCLgcTigHCeg7M96P4.Kz7MVLP3Lkv7wO_duVan8HvqIKUSAPYh_eYGM6hKgLIOu1rV9ez6f8fUej9ufgEcBJ_lVisYcKQQHmxQQ1sOizvRdbjIZS8YTZv07X.xlRVqUfiJ5Rlae.u5M6QlIYRPjvABxdGASbvz5DVJPvD3SyHMbop2ZAQQsNIhaTog8WZsW7PLGZN.Awt5gM3akVhvbyfxwyJHd4_KM7alb8nA6AC1xcQa0.lOZWq6QiwAYAZ3kbugEvbr3.Wl2rwnVTcx4C.hATX2JzPItGzFc5YTFiJZenb59O2MDzzMChpUAPor5t3mc6.vGeQPrm1pornBaSGXmuPCkxfBuU6M2Erkd5ER1Rsq17YJ_G4BOTLt5TolHBAGbJNPKOimjNxdA_lN.PlRyuWgKgB5oQDxd_wyTiSHIPV.3zVQkZrypurHrZEHXQ9IMSDyNX0yfaewt03DUy5RVcv5AeOYoyO_7hrXFXfcZ4Vtf9v8rsd9dBCH0d.T90B9Hz164ioyYk_BMHduXwUQC2aUTd17fYO9a87PMrr5DCPomVJzV0GDBShRMK7PUiuVpeui8f8UzlyQsh78L.dXVot8wDLp21u3qWMtE0OZ.xcZs_DMxy_0QeNB5zNp_F4aJ_Kj6ASGRljaVC4oeO8Juv5TLxYe0PNHlRnj.AAKBhzB2cf.LgcdbSH_FOIENVv02vK..DbO2uZKsnruBeCPPzf5mydlChdMmDXGNQ",mdrd: "JCTwXuGWl.9PJY_NOmQuCvcImcsyJbk0a_KsX1gPsho-1739223476-1.2.1.1-mdBUtapR4.X2X0LxS.rEip.CVOAXe3_QFKGrhguPoQjdZ56hq1aEB94uYpgFEdIFLuhvus1Re_yVqCFfvCF5U0VAs3w.z._cxwLyg1fY3nuxtUhpEJR1EWsQXycFwYdQTVadc6pFT9IbmQzKrskuMAojYX5xyzDqzHercGgxgPvpFdSS2AlryLSDbS7FbDFw4uGUKviM622hLCNlzBVyhVYiN5_FI_4731gqvoUYPhkC5HThuW2zn1lDvh.72ZV8IEj6Fif9do4b5oN.tAr1KvPn_XIb4jK.Ob.o8GF.6hTnqnPs3lkylWNNzfOxQYbl9WXfrT.PfXV9C6NP7PMJ.3aLXR1gYuMXRZLmvHH._hxAn03fClQEmwY0S8RzOinTPZRPoxIOZ4DpYctz8wq6yAYR5G8pqdDVajxF8DiZ8rrU1V2BegRy1J0e4Pb22f.MgpLlVSzBKND.T0e3WCqHAzodNPyozRMPaRkFYJl.VbqOGAknj.V28zYLlmVeOqDDb9ANXn0ptcVwc1OuzDu4dXVNwJ7ZUWq0bqYRM2oC2aafOyi2W0wtm7Q5yLSGfw4PUEvyQpu2QgGcyn34ApY7RO1zpyBihHTu1lT596eL8qrqhvQMlcmwmE00Me4MyYK8l54JzT_V.iCGocWx2OhPV0C0r3D5VjEuVQEUROA5EI3TLEuSQW8cQAUoATKl2nH7PzC0ErRbnaAuVqg_JgzFd6pPkj0FbIAyDTrAgp9WjtOygf.NvHSVI.pbvnXCDdcbVSkv1DwufNVEkmi6cdCrIOOgL9rw8f71yEoWJ_MqhRB3sCKAhKsAZ4z_RWJRpGNMhkIi52OFh4JK0J8n.KA_5VTP5Zn9MW0btw8LUqyF_wAaRbqGBOy1q7r7Cx90i7FPcCLvKB9u9nD6UFrRzBKGT5.OoFknkEru6FlZ8eMPPNodl1e5n5f1VzaMqCPL1e7d8i5mHrALAOopse7VvkJ5UsEKltmazSEiVlS9RJU3vB31jhs2HnbcBL.z99OElh6qKLVhkGg4Sj.wHFsv8IfO.h2SlUOFXSJLfowoS8bw6usn99ku5prgmyVRN0Yk9stnJumsMNM2Esl03HGPIs.6Qg7iypi77kZkNt9B9ADBf8swFsRKZB2jSYzPoFUIGNMy.5gIa1NiUl0yeJfRAMypLnPOxf12c9hjnKGyHcca54q3SnTkD0Iwx9h2W.1SPgJaWPa.8tHFUFBbSobQQsT.QLE7rV_h5FldY_ftCoDq6sitSapdIOxOj3EmznMAz7dzwRlrVOzsrE93du_bvRh3ki10J3VcOfoU2T_FGcuFt4ZdjDYlw7PN65WT1JTj_J7NdJxL1QjcPCxkJq_zP5yizXxn4Qcu_d7R4atGfhs1MqMEscJLXGlv3ymFbE_nnnUrnWJt9uyPfonmXaU7xAO3nZ11Y8CCXvOjxc9FOWnBn_gvQmpjOh9pInkFa5KX8mGTcmYBCKOxPF6sjnbFU2LZD5qenqoNODh9akIKLwbfWzrYAwJbNhHhGkP.9CjDpVxffm_v5nEmxkwgDJ4eFSHoR8se.6TPe.x8K0NmMZzNGp4rW9_pY5NrpD2Ph1iBmzr2dMRRNl1KpdNwSzMvZzQem4XAZbIUX2I2w6yB3vRetfCVFbFQOw7XTjjgrxOK3Yf4PRjqHyuTzGFYIwHWySPcp4UIVebx.hlSdD3tkRerO0FYmdNr6fDdN.R3yFz.Epl796K3So9WV5bcACqjzjaoDfPdi4OX4mD6PqdhWxCdnVa1_UOkSBddpWjo95T69Zqpymo.plZf.sQbUIvtS5quhu6obnCDwAHGIkPIRmIxxCR_5tVH9WykEO5o.3W.Z1Cf"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90ff3e4abac9c95b';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\/339992205436?__cf_chl_rt_tk=t0TGbNLumrRgLmWbgIpHPbxVYQOxi86B0T.V7ufoXTo-1739223476-1.0.1.1-ZJnZre5ZTwNTg0NHUQO9W0sZr017dedhZfalStuD0ik" + 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