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-1530279468-gov.caltech-edu.pp.ua/post/529511284056

  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-1530279468-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fd5c02dccdd63c',cH: 'mZJjdUWMi46DjN0MvSHUlLQKs_0QB4wEMlf_kET8FLU-1739203722-1.2.1.1-udDfc_3XBnJS_oq0pxZUplSGKjebjTO0hMmbU1rvrJhPnjKj1XXJREt1g625RJr0',cUPMDTk: "\/post\/529511284056?__cf_chl_tk=SZ0G8myTt3JUP5WzM48No._TcHubNdbOckl9HFygtNE-1739203722-1.0.1.1-TQfk9PSCRLQ4P7JKPkGmuyPWQqKEKZi4PJeNpDDFweQ",cFPWv: 'g',cITimeS: '1739203722',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/529511284056?__cf_chl_f_tk=SZ0G8myTt3JUP5WzM48No._TcHubNdbOckl9HFygtNE-1739203722-1.0.1.1-TQfk9PSCRLQ4P7JKPkGmuyPWQqKEKZi4PJeNpDDFweQ",md: "5aZw6I5d6VHbiypnslbu4MtZrCn7_RXBTA5etuooaNg-1739203722-1.2.1.1-KTGjT.yvFe0hjw_G9ENO8b5QVBwgRiAq18HY2CZpsTgko0twyZXGdVKzYF01fI.DlYsdzukJpniIsR0snhpUjdUelG1OP9Nb9IbN0l.PwOkMHURkcxTsVoMNPWn13QFUPllILBlkzi3k5S_.6g10_PiLUHYv9nkImyZ0gFi_iXlXO4eM1XKSs26suePYVF9PBh.W01J0VkIlkLIn3wRzv2h8dgoXVnqcp1FK6OyKFKSEgBhqUivkzH7jGtx3YMAy879zb.mqxFY9LoPT14SSacfyehSNo77gfucKa4J10xjgePRGp3.6nvFzeN.esLzZ_Z8ZE3RW7QOXPcdAVJtHepiaolSbqR.LYcUQgzjVywRwWYpzkOM2CjmE40TddsRAinyvHFQPR3dJRv7wZ1uJXPRgmOpB_Xskf3z.dTA8w_pxHOYnv.Be.8YNrlF8c5iezC0jgCOjD0XVCGft4MQUefOHo4O70Bq4I5uZMxOpSNMiOnXmPRNLg.qiEMl5wsqFOSrr0vYLBuHeeIqz9HjCQutUWZrU9AJjRRmYDFZTAECSzU_WMuvr.Ri6kX_Lui83M_3ZSKk.yMxq10mCppfzT8lcc4wP7GndqK37_m1tYvMQg7tgD6.hwNIHbu9dLuXaNqZgQap1P3QbpQXbabGmigKJfvT0_z5BR2G_yjRWiQzzr2S9myiXTJxwiiLSg4gMEAkJrp8bOgVe2289TVuWrZILm9DG.IM7scAqeaIeIq_s4czTtmLnB87MSZGuYE7WvhWZgqXt_p1EavNJNor4cs0rB7ksgCZKQq9H0mIjOMvoincHynBM5B6wPORMsEL6ZWlXQNY57cHIoMH_ujk.j2KK1SUS5Cc_x21Lmgd_MW20Jei6EXJeMaSgD8a_D8fO01JVuoqY9fn3FRBxn5lagwcizopFUVsVJj80Md8HSp2rKu4fPRZolpbnOzIPmkf6eQ_hItX0jUGxA5bpNe6tGprIVWkd9HX7y0BXNVfwsgi7O2gJQ_6ouxCMDvMlccoGmynfHZOXKKM2Kr1R9os5dtZoe7kezGC6.YCi1i4V5iDKBUa0tcA5Gw4x.oeFeNYWvO3zW7AbUy.AsEKNJnLUUlmmK7rSx4IL.zVMMIWzKYyTpRSQXNqxsb0B9C_Zz9vVPnPPlxjvJxr02yI2Le5Z7q3L0zsQi2vMBsj2drFWQvKOV46.r4KKVmykywt9pJtdCOACvoR25.wSmVn.yCJEMU1SSkVSUob7ksDPGGsdxE5KP1PnkaWmr_HhwxDhNEN8CuxamTx1bS7aoSqk7kB5eVJgFqIJ_d3msn2K9gUkPnSHIRfOku09OHAPeFwzYPoqyCRjbYlenEWbxwJoLYhZeU6jbhtI5g6j05TvFDPWxvAnBiqBuavEM_JxKg4xqyVw835bL5uX.K2x7j80qgKxXz6HmOryPpIufUKcCufE21XmOM9mTCzHVQEaYO53.i.dEPzN.YzSGE9OR4l_Rd0voht_Hyw6OgAVp8HZNKkuSQDpKNYLxS35Zxkb3gX09a.g99GIBp2RfS3JiqZb2Lq3boCeKe6sICpuzB8nJ0WCrCd.QaL5h3W9rMZC1sp.SKFW7xP4h5..JC9Du8iULYRbrbb9QBSl5XVn2UFMUaGjyBpfTR7zPh42ZhnO5vhl.8AcK1NX8Wd1vQRCywKooHnyvi2bvzpEoamXdhjCw1Ymwkc4ossrjtnKYo9NZUlKP2VOt.NDeU8tBMx_ddknMG1.Z62tP97Z_hrQ7uRpvdfiaB1ctiTFGzlxZnlemLQ.SI6Vw9btpEg7DNUWUTkgN_I6Dl0cxh3khVtBLwHzbSH7WfWuKYIU0eeh5bRRz3_rACvyypqLu3V.g_GE4vHUcTQFCySZWPBUvARTgXv7ns9WzzFF_4avTBqBzQKq6NETJU3.lo.xJUcQ2OXFlrL43f1z3C.fmnz_Ja_YgADwESe8QKzfJrVtitrIcnzd7gNo6bxdwxC9O1KLebYVuqpiO0z9OEuxlVxr_T.H4vdONM3_ni2UI60eBtQ2JmFuSMyYMy9L52dJCgQALqk49RiUIW5vaS65QUuWT4ECA_D_j_N0M6lVjlXdCbjWykgVbPhPRH.HCH7yZ9v7un62EhxIlmHSodjZexowzAeJsNf7n8DZZrUMBRskArnofBoYFPzdPk4Polk98JdQnRLuPRGeDcTnycQqK6f3wyfSy1J42F1OBVhn9iyPSWXAcljvOqnaEmR55Sedpo3Qjmf4iCZ8fklZTA",mdrd: "loutf2ha6FzatwUAr2LfxUny9ohCrWc_uswPrRPxZEg-1739203722-1.2.1.1-9f0GJOCex1koyWXYpNdiXuQWluj5eZkipweqtuOuYjayX9gV159z8lnc8wi01G8.HI1gJ3VULmxFSf9vxavGsCshPnKLSi.lrSYw86baSLOfKdmJKTJ_eL.O9GWtENuFRlNiHx7FMaBVFYAVYwsUBZP1ar2lHJJ4G.i6p8ggdXpyPQUqiB7cpmil__zAQwh0UlXTG9rm8FMqs2zWfAjj63oa3cxVPs74z_XA3eeEtWtVfhNFRX1xJQ8O_XoQ8si9XdhOsP37erGCK3MiSlI9Ja1WZpNnervFWH5Kv9L5JTNhZInYojHooHRf6xXrqa0WrOx..rUqerxRxSiUA.NpzCWO9SUKwbnCEPtUsC4CY8K0zYfDUtPIgaq3FXrosMGuOlgjRQaAjY8.zAUHh.KyKw0xtV_OyvcOJvHvXJwkitGNbv7p.L5a.FkkyOBXf6aA8FkKfloiLManv.4A6LgRVrd5YGJWSwe8t8N10EcC8ihiMrMRZBr83gKNGgYbNhevgqx8VE4HXMfVVEiqNFZgjqNjVvFMzlvz37zhg7ivE8nSNl1cNhDhYS2LS9G3Ib4KpnTTt1YTfZT3QT6DrrGV6Gf4.HLOMhhH_h046.3kwYNlpMRJNQ3E8qPxOxQA240xM2D3bUDBJynWiJy_HFNBX5KE7MQsam4qgDFe17ckqgFgtWHAcafhqPPfHLTpGBpfiVWiuwYJJhPT90PZh01MeT6r5LvmLVnPKAndFLtVSEqCxnVOyRrGwazcSPf7.nQU2.75F7nSNqkkSH1NQ2Zb.plVZiO41Zn748plgT6uL2N417dwl9SruuJJNhJIzCE6evx2R5YljZidVXtABWgJp56OKQM3m2t654gPj1ssA0.aVqyJ8SKtfTe4T248IIsd_ct6tYjzIR6vsAYZCzhXE3AspXw4XkHUCfGn_7IihHy_e8sip0_nDzbBcsLBK72LER9MqBEMfYVOqGSvZnwuo3pwTYlODVlK46Ph6I0MIkAiNaIpHN0bxOYafr27Xfc1rXZsSS738ql4KLJJUSCCBMEKgq4JfuB0z3vG9vyd1CofQzMIR5Z7nuepXJHjHUMkQqosw94ieuwjCc8WwFfgW463v7tX1cXngrC_LM7LfSCmr4VmUbgA2jYNKAxwkfA2TD8fhDz9Lvjn8wT.IpK8QlF9qgnfj0V8uwr2NW5TykyF_kwsSgPMtLvi8v2MjxpJ51SZR8ObblUiNqrEzxF4hBWNCI7.jpcz2aO_M.3HfEtCRr7Re2wBwrZ3JaXlYqCDNlt6rV3zvFIVvkdwx1EU1xmfwR5cHaB25wq.cg8iZM0uJFYOXU_PL1D.DPzScIomJwB0WQOy.uRmSqqcaD5emj2Lymjr6wt2Wv_0CklozAKami4MZldH5BaCKYS6zwdnvepsGI80fdhPcOhAyCnrTH55TvKZQFxjxtKOIxApGbVTM73WMTRzSKrEHwwegjLZTqXtIDYWc6jFNwBdeEftvCp46XlWUHo.FkeMzknPi1ygBpwym4uNSkG8kzJcOX2Upfx0MZeHvQaAeumB66ifWRaazkpuJRmBV83HYFnhkw5CRLdnwtpS3bgP7TOC54ozEoYOei6rNsBrO3dgJa1dUT_kAUEkazZXFDqL.svadrisRfNpJToL1.kb5gDRK187nXeGNwPGKLFaQ4qHMJu2qjCvflQR0Rq4K0.0FsoBSTdnnW2RYmlFNYmyUpIyncfJFLDYrNWT0T_9Op85F94tHZtwsc48WaC7UnVPj2vMWBsM1W1Xth_TeU0J30t_hTwkDq2F75dqXoPIUmbB4KUrJLeqMpvesfOovwZIre4IeNGZHDuADf_IrZErDEcvDoji"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fd5c02dccdd63c';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\/529511284056?__cf_chl_rt_tk=SZ0G8myTt3JUP5WzM48No._TcHubNdbOckl9HFygtNE-1739203722-1.0.1.1-TQfk9PSCRLQ4P7JKPkGmuyPWQqKEKZi4PJeNpDDFweQ" + 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