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-5247369180-gov.caltech-edu.pp.ua/post/4580926713

  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-5247369180-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '910087ca5c447f9a',cH: 'NWSoPtuOtIE3ZMW9KIO1kpB_tdpbuDBLfwLyia2U6NE-1739236973-1.2.1.1-L4p018IdvAZeeI.56NFYsA4gWyVLQiXPSUaUdOKIm5Cg.yOOaT2T2o4FRbNV6we7',cUPMDTk: "\/post\/4580926713?__cf_chl_tk=qTt228k1cBOuutoEduj3wyAgMOxPsZ7LztUWraVuKTg-1739236973-1.0.1.1-zzT3YyPyb2WtdAkNBgn00iTRRbZvX69ZWLQYpVb44j8",cFPWv: 'g',cITimeS: '1739236973',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/4580926713?__cf_chl_f_tk=qTt228k1cBOuutoEduj3wyAgMOxPsZ7LztUWraVuKTg-1739236973-1.0.1.1-zzT3YyPyb2WtdAkNBgn00iTRRbZvX69ZWLQYpVb44j8",md: "83I8LpajYvHMA5Uuz_nVUWoD5Kx_WbZUjP8QvnhTQTw-1739236973-1.2.1.1-xExZZyVsTvBmRji3CgK.Lqw17sq.W3u5XZn3JyX4tEIaASAEM5TRWGFEdAQeoZllur153IQ2xl9RY_Tz0wYEQImNxJaSlmh3.OnJ67law25Gs3s5asZyn3texdkdICbfw45ARflEXJ0Pq2hXwAfphBx.EA7sM49LLkdFMh6wT.NIT8uYNWATHfoIqpPJCbDgKB.6sc4mv27jth2NvHXKc5hmT0EBpyW7luvi4ZlD9nV5mGJukBeoXKshWDiHhCIJORnKqwY9qSUs1MuR_UdPLproxGiAfz8pWlVQFDlYtCedt6clxMJxdlOT.bh8SmHGC9MnbbZp4DSLclfgEQx8_CDoSuwnKakBknNF.Z.nRNpF833FV71I3hKe66wowsqpie2AKavtpCXUl.xsOG7Zw3yuRONM7X1XDVIvdgDIn.D7q7brLz_QtEzywYBRfWPjmUUB1oPIn8Af3YBQH2NVu5.cuagB41Rha4euU1FMuA09FFtu5yehgTinBinR4WDkG.oHpOvg27TzwTY6KmslrxNSbMWHk2j38BqUuS3FqneRYKtDMXFCYfucdgAkuU53EXYEjiK8Ggvz_2at9sClnU6KxOXzxFj5tlUyLViTdhK3HoxQ_qdvuLUS6J8NRLvrmzWtzYbQV2UuUq2A29t3b0fnAlEYukxPFUzfrnGnqQV8Rq5AAYxKvwHyrIXQSWWZUzPePUXbdSoUeq00ePm7Jj72w1yCf.lU9W4JFA0MR0wJ0nOkQh3M4ZwYUKCQIj9MI2QRAJzqSLFRPaxtJlbusLw1NbYsfso3kEyhcb.s833b81cmbMrieT2jxOcM_GeQgFMueMdxOSepGlV1HAnoLbhj.PgDjK2vERB9XZrqWgIDgMOpBHel.BMKKFE3Zh3VK73tZueMBoxDErwJ56Pr34waHPi5GVnPJuckC8o1.SxBPoxV17OSp1m1IVoP0D_P6p2MsLKqTXltAbEDRV.kv8n2u6S64nb4.jR73dYt0dy.NX3_1fLjgDAz1Ic3wBIMrfsgdDcpb94_lMKqkO4.8WwFZl18tQW.aPe.u70QkuKWxSALB4aGPWxLnJHNER1Fjym5aurTP3Etd9afEXG_vh1dt0iAwajWKo.P2qoP3.5zqKJ1CPxc5nJgE4Sv90ZZ28Cwy_.zLpPbF3lYRVLV3Kj0u77pHjpP8xvLJji2xwiPjN2xqY8HYivWqzQMlT0wV_saL4gipgpLaSU3hdsOLd3oaDaWnnEHObF9droJBIfUu2f9EUheJNxV7SpuI6MkKilHPfWBiyLlaJcE6JkSlkl6XdKtaapf1tCnQi9wvJnqttEvOPVElY.I_6yOROAiJX5ZCyj82HIebdwb8Cd7CG1owrbYnpMPgtvhfaHZARv9t9xGvXzB60gzYz_xUwJQ1pPyb3NPbY5DFsr1quRUSAsxamdotq5ZMBYlmRdTzj8tX0EW3Z9Xou93SRwkwipz.0jHStGTpF9xcsVIvNxCncVQglmdfizdpO0eJmFJo3nG80rnveSS15HOUiNDDk62Z1ZKxEcggUYe927PU84eaaKublWP6zFKtixfTejY_8_TfqXbTq4dlrFua6AkYtoPerke7nevzvCsEsdAseHL4jMJJFW7LQiepudx1.3nbjaWlcYxq9oBECMVBP.b4zpS5PQ269yc6TjWMn6Re73aXO_EHGzW6ofbozpgm.o1L1gvKWhV9Q4XtCHgBN_k35JNciSpUhFCndX17YULBIHNvooWJx9hm86qYjH49hrF8X0yzz5HLViXzjVHF_m0Ptn_HBu5JYvW9ABt5cDcLsiUjCgu2RBbAguG3TmntCbKAXng09yqZf6w1yIujzIIgi2RpJJJwWnY1RKWIaUuEJnvAyy8NJuMGFj1GxcoaYxBCPZsaWRBw4cTkbcja.ECh58A1U7zArFzmb04v8ZbtGYvs20pcpi6d5F4xh0SqYFGW1gdVeDY17YC9s78izIEwOC5oD7LZkAprrMDpTvlaHgSRQkSE4Gvpg_EruQ9O2IL.d2azCdUVRyfZi06amHxOKwiGvtobvkNAvvTY5monQTQajSoyl1wC4JAzTbQUFP7RRAva3bhvB93yjZQow5Nn630Ap_GFjN87xVwQRVeT.QGsw6HjA1irK8do.UKl7QqymNArvBrWIMXGm2nggqZhec_FhLvfrt6dQZHkG7q_PNTOvMqwkSyYAOGUb8mJNKLq3M58Vrw.sgF71KNxv.s31G5HPeK_HVwkitREJbTBzBdhA",mdrd: "OBUg4W.Imd01NbYSOVvHzEw_qOQrRcOZY86J4ytSeQY-1739236973-1.2.1.1-Hlrpcpg9d7xZZZiighVfWioxJH524Hh45WJA1GY5cIqYlsC0WxHHgODThB9rcne6uZd2c89_.x3Y3twQ6cZ4r0bSIcLOHK9AOui0Zni3EnleG59TxJGWqya00iNKUqrQaGFYvxALIgKD9Zt3qerneUCGqcP8CZ_jOY0n4QwY5kp0BuuwCyowiuYVpUYAvQyjlttdI2KfCXBUDbyzGlHY7Loyz1FDxQLoIcGgI5cEHZPrgEowcfuIsYZlXy1yzbyftyI.PRE.eOcPEjAG4iGZWcLJNPYRom3cQQyShkELhaUg0sNMWn601j8af1U.3ppcZsDp.HOZ3MkVLgjhXWgTAhISerOVApJGhrC230Oy3cyYhZON3uKv2c0GrkH1ZO67lxpTpSyPTkrVfTeJRz6B.KOR9iCzhAeFRJq8NA_H_CNhpECY6lxAsJFf3p43Lcx7flacXRXIUyKgnv2dNqnbHiiM_au5hvdy69RFjTJ0oiFiQVFnx6Ae4OH4puOqrt8OKc3mViDWgg2GsdyPBV0z2FHOBqhyO5mSJTdJ9u_uHRVHwJ5y.xFKKZK7eUz0ezud4Id8f1r6chstKvS1n4P1Qr1U.0ezpJOyf.KS.jhXVlkJPdGr_h4T_9QiMK1HdMCDqJMQbR8vb2DZS8qzNXbUWTi1.pFdjYlvwFSQHXnUnQOjZdQvrCjlnvALkcgw8GjHchwzSWpAsM_i4ZxDw4_LvYf8Ppt6CTa4l5CGRPJqmrh7O93OjpcVjYWSwpY8moba5cKkfvVlWFhNvrnb543uiT3N6oOT0udE_pM86cnI8QTldfHacC0f.FBd45spXoV3AplRBm5EGf9xmhpAWUvdVLS8J6lqdIl27E_sKLp7NlRhjoBM9DJTOKEDXsaw6hEM6mDlXwk4pcr8X6dDKWCX4icbvCJpYhpasIgKAAI5TWRXgiXI4zeoIbzFqKPs1lJfmlvqpB3YKLilbkPNw3SkZZ6g3cswQEj47JLZd_ixio_pwiG8LlId1lUgRfCEPBZ1FLhsQCeyrdVq37_CdYE_tC6XefcWuS7jFEuY6Z3cmlcoFwNjzUAWzK285fhk33GyX0_kY3XTSSU4G_W3_VL9dIEBz3QC5NOnqydkj5Y3k3VDVk7sehmrumt3iRrKtdhPPJxpj6jmWwPn33u4fXtbKJO5cd34n.q_ZwTG6Id.czyVoVVjmS0sg3ssI8B45gn3fqki9nTADeWaVD9Y3x21ZSJ6QK7If0uIGZQZnQC96Cswjspkzysr9drX5OIpZLLUyUVuYKfIwvwYkCJR2_jTBCt3TNktOd1TQOjPID2GnRTrTb4459s516SIxdzr7oOSmoBZINXy24KhtPN9WFXOLRIuMjNwIRb8H4lNoEq8qQ9lgKj5JjC8AF7fT2uSqTgpJ97mZ_RRYoaF9LOCcA0KtKbWXuJTshKvw0JaDPuVn8Wd8VtOEgsbuFuy6YqDFOGKe8X.wUyvWMAYMYcfFOZ.vHRR_kkIlb0wf9nQJaRFFds1XfB4lsmzv.o6c1GaVPfRK.laxKF80.p8BCYT1kITdHeXWO0ns27M3NNxeu_bDFPAJ4088oCv4SSYR6Pn8aLxwjKQKdAP5FPTunQ.kyLdUO0jDziwiuoK.O5u7OoBQP_.B.6lhf.CWuJss5WCElH9ILIBeKjS_CCyZ02Gy9J8T4mHpcgDmTXNmRkfh_kmQq_1k7LXRWUdUqq0VoMg7gLW565TP4RNf6jRoB9TIeCkXmcZ55ZorxZPAZMDC1mtJETgsImKkrk8A_6x5zG7A8h_9q0zIo39ASd2wWzRyC26sIB7_wJ_QTRHyNV4gIeZIheDzjgazeluisKLC26eWDJUpc10P1M0J04kfkSCooZzmA"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=910087ca5c447f9a';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\/4580926713?__cf_chl_rt_tk=qTt228k1cBOuutoEduj3wyAgMOxPsZ7LztUWraVuKTg-1739236973-1.0.1.1-zzT3YyPyb2WtdAkNBgn00iTRRbZvX69ZWLQYpVb44j8" + 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