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-8260917354-gov.caltech-edu.pp.ua/post/517692461667

  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-8260917354-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '91fef49beed3dda5',cH: 'MtNpxfms2mUmMbCkgrtOFXxeY5LnBpWHZ9PscVHuwYU-1741904813-1.2.1.1-NFXTEHPi9kdN37q078FfL2jrNkHmP_nBNCFTE6CqeTc0YmUiR0sucmTqlFyHiu7I',cUPMDTk: "\/post\/517692461667?__cf_chl_tk=hcQYJG3RjxE_w.QS2hCal.Q.DJvtxYRprbiGNGsk9mQ-1741904813-1.0.1.1-HSiMagNnZ4tMEfvZvbeqF7Io7hSoyrfqiOkAbAQcWow",cFPWv: 'g',cITimeS: '1741904813',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/517692461667?__cf_chl_f_tk=hcQYJG3RjxE_w.QS2hCal.Q.DJvtxYRprbiGNGsk9mQ-1741904813-1.0.1.1-HSiMagNnZ4tMEfvZvbeqF7Io7hSoyrfqiOkAbAQcWow",md: "xuPmAHMq5DWDzQlRuxfnaL2nndgAZKjlrHLOZ2kRltk-1741904813-1.2.1.1-6p6n_gUGNEp.5jNIU0leWrMUNly3bSevEwK64jEzTsabOva_oLuD97tUVFip_VheHY6vWtuteVPRX7iwZo82pd..RPXgOTozrOUTzHjWkIjP2wxLl1_0gfMdfZorBvhToFCdldD71ZwbSYJYi8GW9LIc0HpVaYjUJodhORpn0CLwMSKbSsK0xiJwz26bvk_RfkB79VIoBE3j8_qY1BQgYm_ZlUk4HcGj1euoXO5FoR61aPCHwkQsN7xFLKAwSxyLCimq.Es69k1E6SNNEo7_d7dQaQqB5FQCqO.71OCCdgFKQLIMNenobp3twAuQIXswsONJszhn9q3InD_Xb_cxyBvtGfouSH0bO0FqeaAtlNxXxKU1FCSqQuAR3Hsgro_SqInpg25vTdV9y_N_.uhLWIkipphEwXwCe6BS5157YKrm.bmhNvjCIhmrBTenDC3m.I6QG5TDVUfQT0RLelsRTkeXA0YtMvVKjpCsOyKAdngRdj67nIrv9v2WNlBw0CeQgh6aozjcXlYIX6rnudxd1oQcsgjAJed1HB49x9T7rBtyogIaUx4i.SnTqgYhz5.9OTqTIcPWp7xBJ62hmR0REe6ULxo4euIQjMkFjuy_QeMoLJELiovtx0aSZaU0MUXd0VRM6V8uZyFl_NQ1W0Fgttwr_WnZwGJsSDVOdk9Y7pRgblZmRn.a2pjVtz9NsMwtgmFA1Q_x53soRMod12aXbQkin1pdlux7CD8qyZsI4gZtA7jw8VzgHkpKEzQzCJoszMBfmru_jqx2tveBev0HsV2n4n_a6JBckaElQ7nzJf3D29j11Y53sgibk2e0at7yKCTPVOxmZVkG5wRrX59T_LL41QqVEBBAUef8RjJffhs_Eui1wcRLsYkc5GbkenwqIlycZDv_BHxdFvm.3m1ewqFa6z4RwoCuJwOhNJ1dgQMOqRRmmpnOZpem6HVrGyjn3UwprlGKPuk1ZQOt17HHVQ",mdrd: "ARV_wDkOzD3ILe80YVE4KD2x_6LXbLmc6.UmA6.F8Mw-1741904813-1.2.1.1-t8nxfEQRNK2YEkd_fak09TRQ82cPQmlPkv8sRxhph0yrXdRxw1ls9StC_yd2fYFcJMl.0sCKAIvxLt9xKQCwjgex8zxevBdu_rCtTyyvhUeVDCYFU3umsoTSH6RwPA7bn98wyjUeGVzGSuuh3OfGWQe5DxcJk_Ck84XfwVXGH1iPTB.Nwn00Ysm6UItTa_dmGBICJdeCIS2CnTMdAgdEggdfx3omfKvebl5aBBkQm2MlzXHmIaxKTh8x4J5sC9HR.RSoDwC_033i9FWzf4V.1d9wYrStC59pxApgkmWfqtf40Vqw7z3RDUNlTMsmng1RPJ8D.mz31M77jYnrqjK8RO3KS9D7VWZo3SYM4cRz.5AStGil.0ZBL7EqYnq.0d2gfDVPWtAMbqsBYagXyDhInbTOmPPxMGIMJ3vcscLOOq7EbElMUInq7FQ_Zu1HLKXMDL2mGG5KOOcCP97OqOJrMag4HahKjChvWUbMqojHfCLRnwHby8PEUhJVJIZoltqRmgr81.SGAeMtmSrRwNdKaQD5SqPBvrWLfx1.Oq2GqSKvy4IPMK_WR0iwdKGbeB0AKYSTUa8NJDyzo6XcdrhnAR._bCIZq0uwGWqNR.wiao3Up_bdgYpo_aoCgRcEqPI1uOjX2hn.7rcU5S9PPvg7tT2fV2LeIlKUNdmkAwaSLsJvV7NyHtROEErl3pOBRoamJ346i3akYy7OLncDheTv9x5xJJg.FODY9jEBSV6mXI0VpKuIMfPt_VTTmw65A.6.5DP5LuTwnAaiSKnQrXIiXF6rRUaviziZqyWJN9RByCiEkEwIwMYfLEMEmDgNQPxYosCb_rQAAafdoR5tbTy_t5P67iBR_cDNrjTkvbbJjDnejsb3F2tS56IGCf0Uu7LTikzV9VmT9PdBlyMlIoqxEu8YpwBhuwvKjSlqL.NOblA14BtPMMN3FHj61ORGVxvuo8kDAmUNtDc0Ln8gsq6IDE.LBo7Wy8l0vh8xa4LIfzRwXpx8.rW2DWoLmfG.kpt2sDuM89DohUt5DuHH_3tXQElQcnxZD1GWdcvWaW49Npb2Lsby8rEaToB52.a6htg_DhLeylcM38amLGnrdpI44Nkugitstyf3YtR3jr5zYIA9XT_d214AiJtxNFBfbOyzOrDWUj3cktfm78ZKaXrA5Cvp.AkscscNT5DgaqdWeCSD5Fdg8bv7hA_fQiM.JfmWioPbLP9.rU3PqLfd4ly3bgQRQClqGL33zSNN7pAvhSG0LQUDBlS.GHL1SAnfN63_Sj7BP97cuht2Rrui.ep2m5GkjVoeuQ.OtJLepWRk0GUGNs_fM5Ayb7XqfvcWdv0JkMFeUsvubcOLou0NDi4pSua.zId7s3fojyjvlM8NnSeI98RDPQ1u9O09WmH_u7HdFQq0JbwlvEf.pyOzE0Fuiti7CyBwi3HJ4mfyKhvYf_uIZKYCBN5zusJ66T.IlfGLPy4AUDdS_0jlD8yq6QM4B8zk0zo7KhFTZ6TVSu.tZ1EJiFA5AZw2RZdY0AQ8YpCTUspchCUqDufyPkWmrljvpO_yVZKY5MAohY7OWmy76GPPoKmQzcsaUarH_5oGrRqEDuC3x5g8JDNgjsf0RdYKQzxVpRtxuxuwycYtAeUm_YtGanK.WaVqAwAC50noVGwGVlS5PxSSAcMaxMtjo0vFWhn60engU8wrJaavQHMwr8FKlz1eXpgT4IwIMx8sWAz3ATV7e1w0t5KkHUgc76CmuA28_EXEeiQAG6qsfGh1oQYo9sdSlar9L8Srg2NfCRpmg8xt0JIlnhktADd3gz2jQHVloNHU4K5sBYO3wdSV68.npkDk6NnPpihOysvSDK2p"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=91fef49beed3dda5';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\/517692461667?__cf_chl_rt_tk=hcQYJG3RjxE_w.QS2hCal.Q.DJvtxYRprbiGNGsk9mQ-1741904813-1.0.1.1-HSiMagNnZ4tMEfvZvbeqF7Io7hSoyrfqiOkAbAQcWow" + 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