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-6935408721-gov.caltech-edu.pp.ua/post/249401627450

  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-6935408721-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '911042819e5657ea',cH: 'nQsVYHMrJLiBnpPFV9u3ymzWkReCqmW3pV_ZZKjYnJ0-1739401907-1.2.1.1-2.iYh16Thva59q8AavZnzhArjXykrHejQvhUgbXMk3Zwfq6qoRpXqSfpRh3W5D.9',cUPMDTk: "\/post\/249401627450?__cf_chl_tk=gVRmVJwEtlDUIp6Za0fs8pjnCXkXrl5pvjCcuKNh_Xw-1739401907-1.0.1.1-yjkRr16ZJBBBFCEIs6YLIqGfybLcpzbR9.bnJv1bOIU",cFPWv: 'b',cITimeS: '1739401907',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/249401627450?__cf_chl_f_tk=gVRmVJwEtlDUIp6Za0fs8pjnCXkXrl5pvjCcuKNh_Xw-1739401907-1.0.1.1-yjkRr16ZJBBBFCEIs6YLIqGfybLcpzbR9.bnJv1bOIU",md: "4dIFAiy7Pe.cp2mN2heGNaCRF1HLLhihz0UMqITFlTY-1739401907-1.2.1.1-E9bVkoZP5DHmk9UuIP4BiNgdaeIMN8kVF1VxQnm.4z9KVEhPVjuSMTVxkyVexg35QySeteDhs__xxs9n9JZ1SARE8coynNEAXj9l8oWQlbLADi5Czk8lVCmDeQxANjxwQ3e9MdDIgf1XEegqQ8yY1BBLR3f.tcf8NiYbo3k24BSftb6T5j4oYHFURJJmTKQkmBXj5SqDtVQ1am5NSLSihg.l0.N6l5H.VGuTgYw3RvphDZTb1nQ37rdAxW0DDmHlZ9o2diGxR_zutpICnYPXCjKY5MBJXgpOFj0OmkoNefy_Ulf4xli3kfPinU4jQ.e52BXXSd.99f7oNVLP1sxF21HEGCex_g4y5lhOHQlMhotLilWEMOT1OrAeYQUjxU.1mJqb4ZbwhTr9RWrHC5DprGnuxZwaFZ9df1m4T1tW7p1dAdvb5HiJkev_e_9XsLgZPlka6J7m4bLIYIKmTFWdYc8nh6gdIdi84j1CD_Rw500OAxfKL9pStXAJOxuTRjrytrhedDkNKEIDK5UNLE69.JHrp3f4hYKei70UE8nzkRamndNo_0XBZZQsUtH9unDk5gabMadIDN11Ln3dtWqi55KIdmj9cI0i0JHidxlFeE0MPu3F74bB5O3Qibbm.a.WgGT2Ve78w2C6QSkH.dhC8kP1wepAVfsUBLz7RVwjpUWXs_QS7Wh1dWwkuQ8g4r6xvkwi2ansqWYbeYKqlwnzAGhaeWjDOxEMQ3LYC6G2kG3uaBgtN0dF9CnUkn0cgDuSgwzy97Z0bSwMJ9_xjegBjmgY_lwSd_CxQfljNKFcnSn0gSNdSbTUwDFMep0.ewfmDU3qxfa9t1jr14Fyb2zHakpp.IT5MkpANW4.T0r47PxpIqswKQEomzE.CXg7JS1UcQmjAqgkYAgmYEvgWBLO0kmAW26di9blwITMEaHspYE3zBlhJGkAU.KvGZExqCZ2qIKLHdiIEBjJ.1n8budl1SJN81LWOqBypKn3x4rr2RyCxiKABcCMuOK2YWClhj6qHSbR_9Bi2ODMCygGSNmeExcHzkK2OUhkYO1fYIO805TO9nZW_jvYrzHLm3c4y_C9FHa_PCjPKGz64OE7gQAVJeU4AM7tGmGgFp1Cf4DPidVdTQTfT89_i8ZWKKUSoeHJjLbntdXmP59s7w3W6b6BFl3BGQG5dwuPRLr.fJ8nHFVbVfSSqJjV7jlQbpleDcz.T1YMe3zyqrabNvQrJR.Ot2H02scFI1i5VHvt3vavbrh5PJ3IiOmIlE_YV3gqwZHEdmFEfO2UsS.NuuzcDbCFZZDqgNhssTlFOJDM0ydIfAnUsCcBSJiAtpq_KDyQ_bKfIND_B8XlnFraWXPoLy3GPfiTZRRrM5Qcm5_16tfs4GcYghgbcgdNgf45I4cT8.VKmjIvhJ4xw1UGIvQTUKWStLCMrUCGrnlq7UxDk143mq4eI8TG3tr5Ma33iP5B6qJ4HkHtTlRgC8BovE2T0_vpnM5EGZlAIbJ_irH1dqd5N9D2v688WlyeLDH.MsxIchlLyIYku7UGPayNEeCsCcC4I41wNrWwGxVv9drcfOPUJxoZwdpwnM7RagWK3cNeS2RKgr9.odOLxheNVcvmgFZggQsS4Zawn_YrhUbkC39DAZOEwAg.XkCcLy3VOSNYzHzNHD5HQjPha5qJfIT5AUA9PNtlvb7wXq0G8BJHU5rPj3VYYDaJY8qHj4sZHqP0UPM0BMP.eKxQdXNib6WIoerDSalNTesYVK_Vhri9jTWO6JMz721zXJRMcvkfSPOg3c__hHCWNze7o7GNiE3oBMA3GoyEWEylQpZ5Q3PAhBUwVnFCr4nTLPIwMp9zopUJ3PDLOrLeF_YCwnl_6NMJI5SEXO9beGcM47teXd6cj0bdSHLgO_yfj1Xl8WRr4EYo.qpNBrJAC8lKjDaQRZ3zIGdyHbRUr8zYBKA0wcJnugcr8krm1SBRd4D3A72egyMxcXf40kF2xEFT3BM4kVpoRHqloaGMxqD._QrvOIF2NNkiPM.BNS8T2GrF_ot0BML1O7fsz.NBpecpQttLuYWXmibatv_.pvgE3WuY9wcZvmoRoKir0lNDHqwPZwlQCjSLyqAwA2Q47bd5XZnYKEZAS51glruQ.6IFwFyT7tDn1taOx_Inh0_in3fRXRvO27vEll16eIehs1uTiy7LDpSGV5WM0jDzcrfK9b8uJboQF9Lv5_UfUZD2LYMaQueUWCLsCs1udtZgEZLlupVgKZPSywGNSQ",mdrd: "KKjqLwYQ4Ilk2dg1stQa.GJwNtCvw6U1cbICJu7puFg-1739401907-1.2.1.1-zUrws6uDmblPnU9nELJTY4lcn7eFcGKzb_U1d4dEOqc3fXF_gy0EE.T38SLplWvzYxCM9LGgtzt0ggdlkL9v1aSmQDNMkl9fukdAuJ_0_d6r0gD_H6swu76IGuLHqNIcobWTU_J0h2iPiyYPinXFduwwmSeL3LPa9VmGb0ssUATqc198tr6le64zikXYO6QWTuFsyjB8KljKonovFsVGnaSnorkRyS00PjHaYTbwfxheP6_OLe7MCv.yKSZHVymEp1L_WN36Q2c1PQ04RxfwEPmcRxdSmyYMKOJ_DtlzsDe7DRYwOvqRO.Zu_eMHOLSl9Qt9fa4taXGdZs7ovdvcqZHCKZ9lw85zlJmRCQiCUOWZkQXsi3UXE1m7uw8ZAQRjCtsY5ia5uiyWajZd7umgo6jNjtkg68QoppLoF0Q92HTg3OswEPTRgzIlVT5I3zMTxRicXrZoQ1fWyQ83d1OWUiH1u0cGVq0AVb9NDevgpr2skdlVg24DbO.LwxVCA0BEnMPwuGAAUnAcOhn0UADiipP2I4xTV46YkDIKRis37IHmD5KajM55OLwg_4s2MHdZRM_YgbANoHrJdJeX_vhFsQi6r4lWKEp3mP6Zt4mGsT_gaPXO0k17..yCg0VQZmV87wlCZX_4TMUv.kZx06QPb5n7ThMePk6Lp_jbwe5FPNQOsrrV.ptNduTrlowSBFTBGL.BM3I6w4bZl5DtellpvmD76PCvKUrXthPC4Hujy3gssOKOnHmgtKVObjM7RgnqWnZG7tYqMEudd.DsYgTKxUi8h7pOxGTlHq3C0scIBLHGglKFcLwtxH0wVmTCT7OWYpUTlLbaqf08GPoukfHdEIKA85OYxd8I0heOKp_GjcU7gEAkcsHfNIOhn20UHYQkVZY8yj7LljxnNgxkiNcgtNe9fUX8GJ48pOXyFq.VcxsT5O2860z4npyTmCmaeyrvuJno3A8NskKMnDyiZJMoWOje0QbB_out1HFsChK1NiLfub55todmvyvjA.wb13YJEp2AWgPEtKeElkAIAhKEAA2W.GwYieiqNDGUloUUFpp3YknKlNUohD9sedIol.64zY1xpVX0qRzGXqGY2E7W0zv9QwXWl0zD2.g9ArOv8_6SGM2ysHVVemZsctJgGcFLLj.Swd3vm95mEDTgXIcuTBfCvn24YWdsam1NzpzPOJ6x6e5CDTYqHqq14_pwBgpEomszTXg0tu.bs5GNhIAKFIApiCxkkjnozxwjizfNmAJ3xj2YbgTAo2R.quTzb.FCAhmCbu1A2WKwgfpl1AvU_UYGflsGxzcKc59zhaCIhoEHOmGVRJUcqaomLI.0nZ9lgUuMIk1Bvh6RupBlqg.t0SzgMRXOr.0f_Z1Ae4LJ7jYkt7YxOhcyepJenBRkwKkLXGLRNFCbH6EwKHImYvlQ3ivLNG3.dt.HDVcF91w8WwW.tNpnThTD11qOuFnC_Q96TUXTXQ74_hPicS1sWuc3xOHEqJLwZAzodjM801Kg0GATgN7wBQIPswCTdc.pg0RrhqLpj7JD5NEg0O1022sjiEK7J8sn5.aUnVv_KWlhxqDGGei2P_PFDnvj3js4BX4ukK_LTTRgV09jgQZWPna6f9A6tzIO7i3EHiOZKNM3jtsHZLHmzMkrwsXMtzczhYlxIJV4j.KnR0yAuZ4_kPsOdSYcNqylO0nOuVpy1LO_iEl8QB.zphyigfejeIuiFdCifqQO7Ir3r8E4zrQxkHpdev0Iwo3DGMY1L.wVpLHFFpRnMHInHwPqLsrXegUmpfzlVKYAkOVJVXRVSnMhnrG.fg"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=911042819e5657ea';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\/249401627450?__cf_chl_rt_tk=gVRmVJwEtlDUIp6Za0fs8pjnCXkXrl5pvjCcuKNh_Xw-1739401907-1.0.1.1-yjkRr16ZJBBBFCEIs6YLIqGfybLcpzbR9.bnJv1bOIU" + 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