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-1073859624-gov.caltech-edu.pp.ua/post/3458719620

  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-1073859624-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '910aaf211de45afe',cH: 'vSw71jnhxAWBqd7XAuZchVYFrgzpHttUbojORWVU_Rw-1739343442-1.2.1.1-1dqrnQmjSbV97dZGqW1QPQXFynm8lBnZlj.c.GSHSWCp7ezVX6UWTFYkvP.wniZ_',cUPMDTk: "\/post\/3458719620?__cf_chl_tk=VTBmyAnKPOSGdxM_hrNWHj39gUPuB7p_M3ftswl.cV4-1739343442-1.0.1.1-YHtglRDc0O5_1f6iRBVi85YU6.v6ck3EOqu7Sq7vzAw",cFPWv: 'g',cITimeS: '1739343442',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/3458719620?__cf_chl_f_tk=VTBmyAnKPOSGdxM_hrNWHj39gUPuB7p_M3ftswl.cV4-1739343442-1.0.1.1-YHtglRDc0O5_1f6iRBVi85YU6.v6ck3EOqu7Sq7vzAw",md: "UVIhGMwK6TRBjPmiCUQu0Vw5ptKK5IUAyfLaoqSzVQg-1739343442-1.2.1.1-UgIbRkKu0cZzRavT4Q0samN56gyPtgfWCyowlG6htLhYeh9DiZggF2Ko_oB49pKLWLtko_7BBrqtzLgqT94onMZGXJnX0oycbGyf9d68ohfJ_5I5_CeMvUnKcjjJgdEt9es6wUtLoVUogZbn_D045f7tex8jXYxD8mjVqgeK92y03r_uwygBGx4dz9S0oyJhK9araTljwGCY3ddgESgT3VnL2nsdThZ61lH_cJ3W_TZ_ZmjaKqH0VNmqqTt.yTkKyBZ5clqKDQ0F89N_Mkdbmf9wb7xpbj1I7HlHpzGfP.Nb3_5kC4p3I9tWo5NKJx0sbSC2iygYCezk7RfYQzuXNlUoNdnBe.MjOEFTteopaX3Fh9XUeDMQMT3jXusojbUi67e71v3RO0Zm5OBUC_kY0i5Ctlr3Kpdbi2qPg55_ZT5Giuil_AiNts1pvKd8SjpWp0vCF2rUNAgtwXbfZZVjtzMgsu4sh_Eeww_2_xFNkl7J8q3eyLdGwR2y3YLn24pF6ozJXFvQLrjkHGk42DUVhSWSsipeS984eF.oVnI3wssHVFtZpUZP7jyhPl.kCBGPZEtaYPwt0nz91HPfnZGqXZPKoMIJaSUs.O5OtAw2pm_dLiM7AfYYSKbPYdYdpTDOQFukcsBFofnbtiYnDD5pnB4KOJNdkB7vSkQSPffoqQgA5r_iZjFmlRn3qK1uHQx8xt.BdGZzqvgKpiuJSm37A7d4oltLieley_BV18AfVpPNkEuMq4.VRYKtB80MjG75qRkeWqgnVLVbI506KFYpHKlE4SrqvalPhWBBCQocoC6SntqvsfndR2zHtv6eFlZ0HhINTpd.SEYzs.hvlU.LuUIpEVR1J0ZmfMGDz93xc80OUC9EnQ5cgbm7tqxlO1eCRZY88RZ8kZfeIGnKPqFDbsSMqC21mb3SzSnHSDQmsMCbZ4tg8W4W1BUGegYKXNXSl3i5kyvto7v5BQkUj_gD2qt29Q3lJJzC4DxyvUn2BWmv6JtpSrH8ILm0NhEYh71LN54BxGaoQcrRGmv8qu.6nXGjwURfaBkA8H6mg02Ql0fOAhSDVkRzWZ0wXkxnEQpyMJPzfsYHewQR2pieeaYG_xiY3wc3XiJZvVr43ONHqI1cYSNZAz3qCXsg4uuZ6q1rafmDyEX4rfOEfgTEK7W32zoYhSQN3GPsKib2FUqKYyyC4SgyFORHkNW2.Sj8R6ADhRkB9Bxiza6uYOqmCFWJ6I6d2Zc_AWqKRxo6Hz0.ttiZR_2GdQ6J9vx9y0BeoW8XoAXPtJQYMPBQtPWPkV..R1oyG_qj4wLHf1dx4Q0PxkUHAzFkVmUwVvqc21emintM7XE8ArsVCVsqrOdTM97N3AejF60sml8ysQD63XzSfJY2wgtExg39wlJTLpHrBurx.YaVCi3Ae1MxkzuwhsQwFVkC_xrnE_loWsrBSvy73l07F9CXqlgORVcGQE7m6G4TUdlsrI4Waz5qAfi7rTmhAvqMOEITAbqlSc7gNOh4RBRugd6z18reoVYGLvkeqJvp90d4uYdIDscJyl5JA2lQROSEe3jF9RYM8_50Oa0JIU35LzU.dDorHe.ZvSaCqbb5JTyF.f034MUjxuQ8xx1e9hf3ZAelqph_Asj1fFdb0EV4XXsyCbTds0vDnPXnIQtxCVlZrT79sx9AzpBW3cWUv17bQ2RvbAxe5O_J4fjf6EAqG8c3ISY0eO2wgBisICRYJqbragbUSzHs0Ef3IZY77yxz1l45t4FOrAMKoHnQtYyLUSQSE4f8hhMGm5NwzmW6cE9W.2h.iyg9I6crCb_Z.9JqT0M0OGSpvcH5J3dGb2u_fiMTlIpTg758JgRAjt1FDPmAuhiMlfNbyqnqFBEzWMaa_UqhuToup4DmrXMKK2u00aoOy6wnpgVpzupkfMYTz9ls2CqHSQWojtEThagis3RSkzbqqgiUXHaBZG1SYgh3Z1aMPCJHbI46TxzQZ_XrNgAj3zVYNlpdfLGgsMfez8.51v.BoGzsgqPU_2GDKv3ZGPRMXfzXmUsi6zXMJJhyY1dH3Q4AHO92glJTpwyWYPHBwhiobiUJhLRsijtROf_Cmef5dET4FrQ0zlcCHlATSWnBz_1645SgruA6uEZMK07DUPhE8shEPRV0cKIImpJsERihXE1MAxCl8in8kj_TZp_A9I5XSKM3qL_gf9KWOdfRfACAm2dJLX6VejprnPnvOuXi6p7xSyeQmwPP3dToRmnLu0aar4I1UVKYUle0kQ",mdrd: "_nzMpKrGZl58FkEtoFLmz8T1p4kRW2UnuSrqTKSn.sw-1739343442-1.2.1.1-Jn9Ij7ujLbgZmB6eMBCMAtlBbF3eMEeqrbD6EPp9BzVIOCRykBoV2x6xTt0pt6q4jCnDW1bIDWrojx0NUUua9o23MM0tQg0YsjxcIZs78gf8y6Cp7uWn6mrG.NjfIU6ivCxkpVeDKH.f3zhmqdsWr74TxDozCa9oPFCnheSfqxJrKqs3PnlubzNAB1WmefYo84X1Eivz5BYQ0TUfGCbyl_R4ibawsY39KqebJSOSt5LLn7kSHhlpD1KWgo7TUAW2DNBijacivQC5dkFep4olw4GGQnr55wvIOuBiPjcUz08UIek5ig7Clt1Q7xkSTDw15XLq9Pc7oAOrHaOqXYCoqnSGpvJfCXawO1kycEvHeNdE1NdRc00XlR0kvPGTKN8bQAaRUxDm7a94Puc5AEWR8s9tnKoZYwitrjd1T44oYUUKlzuFIfRfMM53sL3RPBwYHriMnsZ9JOOfzR5Q.lYRs69C93I59mpRKTuiTZCjpZj5Aq7FX.mS_w3Aq7ewljCb34BdbFFcsZoxmxvW4whmOelndjABoLuRWG9ePqgyt6vg_Lmwr359XYcUahPz2fCWxPZ7UU3LqCXvxWmfz6G7qIkceeBkyxTGwPl6EQ8GygOxNsMjWiYu4McQcv.K9FkK1nNK7l8nepmimORrNhuAYhgaIthCGJ73lcn9Brn9.fEYhYBpWTmdZEqd_2csp001nVIvlgz4oETIOfC8YH2OurVI7IldhWdRiklB4ZbsnUDYBiiWrijfR8WejWau6YL1weanenAjGjZombWQgwnR5Tt71o3_x5mITo9XwDcsShZ.sO_HIJvl10Vt9BUj.1PGhEinrtxU3zk29d8f3mTB4ghkmQKI7Vn8vDlY92R4y6jMg9oKsEDyIKzgwYc917.3QHyyO6GUmSzMrRvg6RdSEGmClyjjfkyu2xtCOxY9M7EworiWFaaJcL.Qb.SyaXNzEIK9lcGxoTcqDgIxvb10NdIAV2AzWC9P44cdGIa9iM_7EFNJwB_4hKFjenbWivUT8HCwcVGLbgznr105pt1WnOVdydIVDbtcg1nEWbnMgeOZ7Bf2oZe55g_Ux3PcVRIfkN.Lwv7aI_2NUeH74978CjYIQdGNcZCAh2bmaiPvPCh3oO2_zwkXPMyYqNGZEcxZGDBoTkEs.c5hvpVup9cpNhJI2pAvCvJ7KUM_ZyLylafQJg1lhpfcHQngKmUtYijyiFfTqSJPzpWyCa1vSSBF5piarhICd7zUn9zmunftkdKPmBbL7U6a4MFytRGu3DAaKR3t.gN1OAqjrRYjvMW.jViwCr7KwMd.053e59Eopf.IRpUCvy91o5xuuTnUPN1Dp6mlHrNVYpu2RLMrPbFkAcDzZ7.nbP8h7EXkQ9G4nR5lod78snqL0AlXhSlQTb6_m8EwaPvCNdwt96tEuUuGhecS8FEnv9odFPgYs2Eb_JHXbHiLIBoAlBh6v_geIV2dSrhvH9BOL42KgOQC.kL8Ayc7UNyX.R0T8HyNmCHXW8X160gGd6rhHLSPJV_PmK6HQBDFGH7_PK3ztbevMfTXDLVGYFE2s9gfDV91.X_Sw5FAj5U6mxc6rgk21ebWe678Pr8x7nstD8wu3ZJoPnXMPt27oT18QHKlVuIgVHmR_j3ryRrnGkFwdXmiRA92R9NYsRP814c5TU7XbSiOs6kguRnc_z4XmGAaR7aoJYfceq49eD7qnf0Cwh5CPRU5cv42iqTCKloWK14Tsj6t0dPyTe598aRMjpJ859ytOnWPOfaAYG3UTo3hzHzcoFHCIp8EGt.agiq9dZZUiKcL8JJqz.HQXT3CZEDE_mGH18AXo8xGBxka7UTDqem0BvWNvwvh"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=910aaf211de45afe';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\/3458719620?__cf_chl_rt_tk=VTBmyAnKPOSGdxM_hrNWHj39gUPuB7p_M3ftswl.cV4-1739343442-1.0.1.1-YHtglRDc0O5_1f6iRBVi85YU6.v6ck3EOqu7Sq7vzAw" + 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