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-0613245897-gov.caltech-edu.pp.ua/post/389798660754

  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-0613245897-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fcc8305ca1c94a',cH: 'tHeN9EmGrwkL.ASxXWM3nPmeWqU.I8oW4.EZNDSAgAM-1739197667-1.2.1.1-jnh2_j.02XNxtJC14j66Bf4KbbqSjFdp8BV25ww12X78_QUQCgCQJoC42WVuZzLA',cUPMDTk: "\/post\/389798660754?__cf_chl_tk=w.j_X4IKLTQV10PNJnVMzeQXOsHnSX66.M4ZcwNbQGA-1739197667-1.0.1.1-coIOdYxAe9X02MKMvK51QQi5W4bKXDCnleIMno5WMl4",cFPWv: 'g',cITimeS: '1739197667',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/389798660754?__cf_chl_f_tk=w.j_X4IKLTQV10PNJnVMzeQXOsHnSX66.M4ZcwNbQGA-1739197667-1.0.1.1-coIOdYxAe9X02MKMvK51QQi5W4bKXDCnleIMno5WMl4",md: "usD_4OC1r.bzvAwjgU99RJ4G19rhIZ4BYHGnr3aJRQ0-1739197667-1.2.1.1-GJ4f.hSBN.9R8xr7c3_zPwhx8PDcHaVm8bl2.htf_L85WNMj0hlUKMs7yxCjN_bpn45smfUDfI9dhiVpzTv9vy3janbhZuIP3ktP39QqYbJCLg40AXwerEd67ADmgB6kPy8SW3C5W5UBmX979_yPAQFh1bGKQ3jvHJVYiUotzLH.dA3I8JY72YVhM5c9NbrUCl61LgdTQ2LNamNDcl.5_oR_2UBTLtWJ3w.lqEdN1VnIPv_wQUmUgSObpey23_BGIN9alS1o03Vsog8faFZd7K4304y12zHbTMs_cRGiMvetudDBqqxjviH81jsRmz21pOfcRmzZA2vOA0ahVMZC1eCR5NdQqYWPC07ggck_Ad_o0BEgq4k_TmrzlSfUS1mwAVkXX4_YJK3LbbL_2b7VBPnwXAMI64PzNh5pY4T5I0vROjE7w_5.9JUl9oHHC7FTo4gfMv.z37YXdG9lIshCndvWRx17j2kw.iukHOuIbjGxzTNioLcCDhp2BnzWEV.rjBVV5eSVVU9N58aRNad5oVuFCKX7vLKjzLdDy9wubHR2G1Yz8T7NM5sgLATd_sVJljhPpZI4es4l74gThPE6IsjnjR__MVms7SK1..xnCBRmUNAA0i9eNeVvEhR.CJZz6xc91ws.Obucpxo3yeBSM4mcO8fBa72fJbeCLb8uFVB6b9OVatUopMG8CLWoha0zXII0yXyYSmkoWEqbSGnnZ8N3ZR5TnUQySrXqJF3B4qgf3xw_BrwIB2pn0EgsamFhfm67hncoCWg26xhY5cLC1Wa7fm8esCaZ4YzaADx713QvmAUvY_D.IWjtmlxhA_v8if_I63StiUGMvaGw7SfptPGX03RR_ZGImJSgDu.CyJzhK30pZoRxXSFepiwn_Sdlwy55pmbBmUk9Zj.LaXKbjuM6VK83PvUjeXsnm0XFKqt71FXddl7NJG12WlfyyP.ZOIB9p0HhOkUyLLQDQp8LTlVnAa3m8qmvkd51m4yEB3ajrkPOJjAjKrqESysIiLfIT6v3PpYq8H9iDLQSp4JWghhdwktvPWu6Rhx12orH7TUhlMub8ftaPxXME6Pd5NYkcT0QjyFTb.91sJZU_jNIlS7xH04iYCaxlY9ufSUaw23DUuL.SB3T9E38aC_ks2JG7nuk1YDCSGQHmlokcpqz2o3uQV2X_W8LRZtT43ADZ8azpmFicpuu4OYgwIcQ5JiHowHF25f6I9vUpxNAbvW5hLnHv8ye4cP01VskemUXk2x3VSS6kCcKlb1OkhD_lR3XJIu3BmJWJUfvE2qKD2uw__BsXmDIA6qwvZhI1b3NAkneKjU3eDZwfbrWvMGo6P38pKu8CUbBeoHiI7CsFtQD7dChzVtlFlocZ1p7GEtTRQQmXPpDThBMpGmnGAad6UDgAr9ylterB_wAaYadMpzzmMUkZMQlWHHi6eUbDoHiHbH2i1V97t.fJPTfYrMNt7JAiQjDs4u8_MlVSLWMoAT8SSRpFgGREMGvWZ12w2FxSe5jnmgeowAZ8sNNtAvWZO1nmmlCeJq3DRcKE66up_V75kmID4fNCn9qWSXoOZTuvKEINtYoUX0YJ2.nZY9LQ2lQJDMtsXH7nnhYiVMwO0E9B5.sow7hCvaZUHCzBlzeCsTp4UD3uhIiHAj2Ef.1lV8umDY37nwUWcfKBRANkcNevOtutNvfmoJB.OqFPKNusUk3XfHVEGIuinJ1KP199I8W7qbw6d7FVpt74RD0Y2NBesY2Anqn1ruukL7zM_T2sqeErc_u6m9CL5EsciaAcnjDru.ulqJyD_lXryYABTsuKXBvaBf_OD8DHpHJBMwIMXxct.72wqDb2kAOHJCx943.Kmx8BX__JqSRunmsfjer3MkbinuxnliK07HM6KBSEGsrapRtNIQHXxvvpERirxHDanslRLXIANYCp4gNjtCdHgXXquH2Xe2FvzJb9j.R1iudqq929y7pmW_zZ1m9hn6Af0z8FSQQDrQzSSgw8yB7HKKDtN9LXdRqM7YfdBxFaUGyad3NYawmO3jRuPPgq7qyD_IUSBPNCphDolkb5CdoIVHPNV6nbl8Y.HXx4rwwhmEw2YDzvrYyrZflOMtfggHkOV4Q.3ATtZea0L.KSVF_qIKoBV9nk04qwb_bbgxu3JBAkHNkgr0x1g44SLnnno8gWNS2FO5AcglZzTnK.1lL_LmhWXfaFNeQgm.twO.YEyVoLWYxmnsiV01.lFwlP32i1.xlM5u8dBab7W7gfOA4mg",mdrd: "bIkIa4nMqLo4QOCHWy49JJyopY3Fn0hnfeZfMeXHxUc-1739197667-1.2.1.1-3Z1okacI4l8RCjj2H6gXNvexsXjz_2M0IR4VpBmk6P_AzlYHb5ZaV_eCpO3YPMrxNU2GbgOv9M4ilg_8qrYGk5dyGR2SCvqpP_sDfIjdhQnINMDs8YocwXDCV8t02BKzGfJUxBHkrOxffOTHH32FFCMnSVkJE75uQK1hD98P3aYq_i7MqkFcbaO0HHD82X_Tjosjb5Fr5fQabDxJZabZzI4X0fk1oE7ZngQXiXv7TyG.8NlwD6YO17NVRrqK7o_zTew_CZzvim1dsDiaS2f2DKsE9y9juwP3_UhsECnyzjk6QX_jRNi1HD8_ku0qfOk2emugVTPgLT8OXF3zA.birjQaGdqfXbbVNu3DjZFmI4Tk8fmOMmBEG6cTS05q4qQhaZB19a0_YONpDweBXdY3Vs3etqOILL3Qm1Z6sBgRhALZhyOnQoVuYn5LjTC1lYMK2XnyZ6Ntk1cHpVYesJnGa53CSSpFQKQfJPHzmuEba.6cmcWYOmEp_8G5.7ltNspE5RAQXCyYcG1scP8xktlMFYYrxeVmwdknbTsdl5YivMbjIyAqVLqI7B45s4yrt9uTGw8OKMRUNUDYFZ1iWMeX_63ZRwMw5HOPQsUCfj5gE8HdWs3_39Je6g2reiR.pnYWPbk3TF2v2ZtiXYanNDyRn9y_pdwn2oYNjse2jOqMS_d3sveXD7XwZcHNmJPfLc8W2zFby_gYFOTOvto5Wfq51Yk6eLH7xtRkWMxN9_wRUiA4tWlj0Eea2nlVbvze5sZoDUNxctbRHpkyhEsXbk4ORllIxqDAI7sZ7gb18nAGGLT1sdZLWppw9pWZZEXuxnYrnBquzLNRKhc59OSFn1QcESVzd23VCI8SpXNS4TvQqAKmA0t_qrBYxRle2rntKC8wIZ4MispiYNUqRrRvVFFzmhbxPovKBZ6iRzbEFWmOqT.wmaZtRcGfqeiol7w4zXnb0No4ruUzUXTun_x3GzbBhpKNQcXDuB.ZFMrfn4OAneg3rbaVMZ9IqKrKbj9Sr7sdn0WkOQXqAZVfwePco202siO0w8D7tTS1SXMLlZ486q.01IZDRwhI51OI1l7JboqxDogUQ5QmCzFx0DIjvJOynwig1xC0EpYtXVZGTjE0yInhGoTs609OUH0Qp45vOgBRH_ws8LTMeSE6PrYVeZcuiq3fLGtlyG5pcYMiqLUqIkV14sTfUZRM93BMg8VUtznCg9qnV_wRIocVfGkIdwUc4G0hZw7sght1jXxcs5.LnLrG7tkVMdFY1wJRfxku915LZRZTOj6qF7WbVCeYmHMGTwsszZ.d6A1q7fzXqTFUyDIEKu48CygQH3NspX7HYJ6Ounm4mzZoNGBGTuoK8VWiyELHTh1hJTzGuEPT3Cu5Dk2JgGxQt1etywD2hihtEieMeGmOV.ib3lsNLvB1UyF4A9fJmFMmgqKowzlmMXQyu8C72wTyvSyFxrd9dH48nIvGr0wgmNUMSieoXQjgS1S8bq9X66q7dKoXKwY0Yx2ea_jgfHeZgSyep_ZmkZJ2ZtUQk7MBVBje4eLlEZIu5x7jGvGo9jdtzC6cfmum7xV1_N53EPSC6Y1SwMhl71j1i6sFtJcDeFAt2rHwbehnVBLyybftvLP.HlpPZPLHQjzqt0mipVe5cvLasxlGvV1lLzJLmMKskieuZqwQR62huf3Wpt1XjMuc_7APETaKCJ2yZk7vgt5z8YWRrND4PQjD8NJvmxT4uvnZXCgXA9rlRBkmFfrXJtamVq63z589X4ggRtcm_a7S9cX9wvMUxg1IF6M5yv_VTfyP1b0mlyLGRqTSO2zOrWbaVom.gc1LLRlTa9UwSsquXvhPopz0bOl_7E9l"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fcc8305ca1c94a';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\/389798660754?__cf_chl_rt_tk=w.j_X4IKLTQV10PNJnVMzeQXOsHnSX66.M4ZcwNbQGA-1739197667-1.0.1.1-coIOdYxAe9X02MKMvK51QQi5W4bKXDCnleIMno5WMl4" + 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