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-8476125309-gov.caltech-edu.pp.ua/post/557057910343

  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,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzMiIgaGVpZ2h0PSIzMiIgZmlsbD0ibm9uZSI+PHBhdGggZmlsbD0iI0IyMEYwMyIgZD0iTTE2IDNhMTMgMTMgMCAxIDAgMTMgMTNBMTMuMDE1IDEzLjAxNSAwIDAgMCAxNiAzbTAgMjRhMTEgMTEgMCAxIDEgMTEtMTEgMTEuMDEgMTEuMDEgMCAwIDEtMTEgMTEiLz48cGF0aCBmaWxsPSIjQjIwRjAzIiBkPSJNMTcuMDM4IDE4LjYxNUgxNC44N0wxNC41NjMgOS41aDIuNzgzem0tMS4wODQgMS40MjdxLjY2IDAgMS4wNTcuMzg4LjQwNy4zODkuNDA3Ljk5NCAwIC41OTYtLjQwNy45ODQtLjM5Ny4zOS0xLjA1Ny4zODktLjY1IDAtMS4wNTYtLjM4OS0uMzk4LS4zODktLjM5OC0uOTg0IDAtLjU5Ny4zOTgtLjk4NS40MDYtLjM5NyAxLjA1Ni0uMzk3Ii8+PC9zdmc+);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-8476125309-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '91104115acc42d14',cH: 'RcfZGBV2XVaRZssFNIUoNQqpr8gQIjQgzoocCD90sY8-1739401849-1.2.1.1-xNJMiTR0TXD1PHTRK3ezau0WIZqN.PfixhyOCVdtuX6KMN5fOdZ8wjxfSjslILa7',cUPMDTk: "\/post\/557057910343?__cf_chl_tk=hd4v9ZGoMNqMF1Om9AU6QkJq3HhVemyuhYOC5rC4dx4-1739401849-1.0.1.1-nt5Um_CuvXOagvv2vL4An7v6IthyXxH4kOHtf3hVdi4",cFPWv: 'b',cITimeS: '1739401849',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/557057910343?__cf_chl_f_tk=hd4v9ZGoMNqMF1Om9AU6QkJq3HhVemyuhYOC5rC4dx4-1739401849-1.0.1.1-nt5Um_CuvXOagvv2vL4An7v6IthyXxH4kOHtf3hVdi4",md: "NqBCMRL1IncDWi0v0gCBsx4edDk04ohFlgMvimihLh4-1739401849-1.2.1.1-maRlZmXZuFqbVxIsArT8n2ePQFUFxKO.xb2YjsC6.13WYE15Ph_BwPclHUaMJLUhGrp5RLbgJ5rB4cAyXIRHla8m5.wLi0yeAGn3iell0xukQmEJvNycv0H_RkLu84Ik9mfk_oJ0lmR45IPPA8k7Sst9eXxkNFECkKyBD.27A6pi_oaWc6aisfQGbIbWl3jdNsAyqVbIeKxtTrhpv37lQwd2HZC6SFVRkyVjbpAHi3GOGYezzwcbCdlUQZVO.vjfGHJO5oJEMQZs3KY5qlnrwwGPs6hvlOI8quPlIp3uZv..dduLrzmaObkluf8FmUof8DMpzVqg4rxXNxt.AawdYRUaPAlGyB4GX4fHfxwzgRYZdkgKzY8c4uqk6YRfrzTujrJdJNi2lws4H431.CInDrqC9WweEi3rhihcahS_3SXx2hg2mUKzzpKf4vvS3oDBPE2XuD8pRd.rAIMmeetWlfjfjIlQW6P2bqTZBgX_nAJAGsHA3x0c8L6EJKbVg_KJIv4QmuIH32_bHb9cN_k7ZCOTigUXiEFwiJBpZ45i1V8IBZA_FpfU8nZY8oVA0ewv1bOgmUxy9zAWzr4kZOc9RkeSpYR8nbmEXKaWtmwElrECTxMybfTfLhqNkrdxXJWCO8sdfVOKo.2U9FBDKum_DIl2LGH2pgxV5VRS8P9wGV2kB_azbvLt69F8BvLHqjzENCklkjIsUr4ahglJsm4zNeZL8Yiyc3ExQ8.iiYDhJAv1ptxFGVnvRlRJjm1xPw8fDlvfWLVWQtqrRrWqwyVob.5fxFLFxihFWb4bSG0PQ595CV5oGaqqiwBAIRbKi8b58BRFYN34Orp_V6junCJODc7.w7mccFLKx_14m0.EmlZpp1ZJNTshc02b622tpM3R5jnUF0Yjkag0DNYWPn2RTNrPRQL0YgbwddDNLTtBmePRwV9biQaMZsHWahMChoE3VXq5Eha.1cLSFTOIyhQkQcmU9Ne8mgC9v7o1xJ3TNQLmPKYc76qfNUSJBcWX7WffFXfY_dDtm1x3NqAtu8u_25_k79ctbZ2dc_5Z6gjfL62BvdQz1NI7khdrHhDiQeKuRP.JNxdDLAcP1FQD6U_u1qWeBhLfDhk3q_xOV1pscdKTYs_R2bVS5O9f4aJB2FoUL8M0xIipfOHkxJXcw9J7eVJPNYWfQjrCUtqoFnYrJc6efoX9Gr8wQ.lWHYymvJHjhkTuYiE.p2xB2UdNdW7K5qvflEozzCoWBokEwm3aY9t4pfzS2FW1fI9wCmaWBX3rgpebNMoWKO14Z.g6fX8VYWly9NKVmlDJG9KgQfFMLuiHNv4K_FEdW5V6oT2zpbpJU_FXJnlULn8acG1jjBhzQ.6ePRmXPqN6ozQbYYdsBDbQl6DdAKLhT3Ap9wSr42wePG4SBECg9j8WV5ArEnIXi7Qr4.trGBkPo7MWDhUa92FJqzNZq4hUfTKI.VZb7jcWzfhQX9aPz6r77FQkqP2EPLRqWx2WmgG3NtnnB9fOr0cQTb7eZMG1bu6UKJcY7ccYYFcA3pFw1FA46HqtkcbPA9X2kQpx66EoDOrDZ4Jq3FxAjQtUGf33InACVMqovHQl3ZWWWA6rt8i7tZl2861wn9ACwpGi6GdhuZ2KKMwW2vP9IAx6y3JDjpm.ZFjhGqrrMDnRkLuuFetWd2Irs28u2opDhyTxv_8bMcCkYv96zXPSQA2e8aaJTQ0_UdVl6iz8tnWWbKi2BGav_mPuQ3.QBdGTF1G2yETQ8gkXgjkYH9tZLA9i8A0vrbDXzkGnS2Xt7xyCYVaUB0kVh0PPyzG6LFPBA7SUlr43HDlZrnC80Fnx26KJfbRcNxBKo3A_frdMx8Al1AQJxsb4sdeAPYzDIE5iPUZsy7Ra15azpVsedRV3qwP7tswJFVjZY2LoXr_KjhgNP3MwWBMhrWnnmQBh5VhQaAdU9qIvY3e7egJcX.6C7_2ExDvjZiI6vHMc25rQg2bnvTyRVp2xlp7j7GSpa3K6riROEeQlcarZGzLrXOiBl_4y7O2kLwhBhC7zZpFsHlYucHpyJMDk1P7DWL6bXks7hOhTrEY1H2uTpPLDNvBbGPu5gpgAEnUC.SNE5MqZI9Dk2wII5bW4S3HK4WZtWrfzGZ7XDm5Dr.wxZf2x9DsIVL89picttW1f4FdKbtuZ1JlES_UiR4AXkHZHQjqGr7Ac8YsKiubXJz9Vyng_ZV82oUMNZMjL6jZ.zh9rA55s.6VlHzrhOQ2jfmzpT2q3jg",mdrd: "YX65Lm.RKeGKvb.7kfrlr4aueYafN7etcMT2075doQQ-1739401849-1.2.1.1-TZekRNY_AKwKYIztYSJkpwXbVybqghRt61QPteGZNx0FzCrQq4A2vl9qBPyZH6rYbGdPGrPiOChUDGxQ4lTyEbVGA1c1jF.Q9SyLx8l2RiuKVd791FO1ji6F72kYAVR3pyocvdaYILNLOxMFvm9Jvim6qsCjiwVyNWPetTEV.EFxALHtCk4la8p3HLozuE71k9lBpD1csHTr3pA5JPLy6UyJNmdHNSTPL9llkmHPEWjxe2wU3B6MMiGXDyLxLgJ316OkZzXZGsRBjBWy1xfMg9Or6rTod50HwHeZZ45N4rWImtIt3P8qcRO.KWQ29tHV8axkP_5PtxqpI8llmiai8fWw61IpZ20ipghXKJBNuisrIax6rYRu2Ub4q1D2nOVwkNMNISOzwltrFq.NjbQri94SiQC91_wrnGCteL2EMvx29Y.8teGGL4UL1IGj6v9ytDER6GMklbNDaUTA.ny.75LhZzxpBlCyoVwECMjrcpDGC1sgSJrU9BVMeeLe63jZ.wr6rx2II5TtUcRefYEk0WXfDtn4nfno0I3jVZVdFre0Mh12yg6i6DK0deU_s9gys1GnSXGQc2l.TbLvykTPVgzHiEO2ROt_avVk29lf2nk7b3MxBfZfI0qRR3CUpyShEi.DyBcJy23bKwKkSWODzukGZJlCkYm_q6gMy_Oqyayj5_A49zimckOMjqP7t8mc.7ioYvibyhYC1BzvbW93glFVtSYLDN4.2dmILuP_ik3IhiLYzpTY7Jhpkol2DgrW5p_1ewx6IY38q0EsB1gQyllDTU7zRgFCwP.hj4dX5oC3mxNqVDXDQ7UN1RsqoSjI7UjQUB6sj1Esu4Z49c_FEJTafyn.HU__PFPNLkjQPi3rsedFoJcdDk2BKSHElPwcmCRsnXPJ.Kv3aZeI9sxPo42FnbxSQ57Zf.0BYof_cizuM.CP12nok1T7tdKj6D9CsRgJTmw17WM2JOcPhniTjYBCgdmhP5KU7oe8PUdBHibUczppOr4348zZ9SOA.zDWPlXESe_TGD2azbR85mgV.cz7naKaFyyfndpEUwtPkk_5QrKrAtZPe.HXvZL30oHkUXXDlk08PfkcVm8SwCr28DfDCmWoE0cniAoXSuvpql4Vo_7JjCkfdvihtxBsdkZFJ8tY69uCMAiMR32U4YFxFoLenNBeOX81Ksi9vfaTf2RG546pbdSipn1UvEV1U9kr9YKy1PD1Uv3A6V2m7XfziXtCE6UyxiJF6f3cf6gHc.wwFAQiUDE3vNnWsN9Kv_XiFYzC_u9kHgDj0JlGeqHp7gTOsDxfHtS58eVTD3Cl9LRrdtN8c9Jk.pSd0L5OdT7zk67UtGIkHmR4ssQdZ1wgxOfanyNLgnzX8UQw_fXsIiaLuD.1oum0_V70v1DJAhsV2QAvFYKnnCKQbQygdF6uZ1TsxNZT5vMDq6tFDOp.rG1kSiH1EUpk5cCFhX5XVh2fGAJdncSA_rnUY0a98BH3hbpPZs4_JNds_yrUkoXiasQAAb__1ljFKZry7o57.px3S8uU7yI0ZWiIasU1BqCGLzEU7jyFF0munOPkqr1IiAMlzcotgccQN0HV3QfVSEc_jc2VGycrxgr6VjZ5HXE5yqtQIGOYTEH2V_t96hRCQ5AWIphNJz4ehjk78x6aUjHaA7p.mZByn0CYAtKbz.6.ns6nZCT45n43iwNZC0_IFxJhVHpc.NxJWD5lowAhSUpVqtMkbWEWkaQEtraKxR6sfs0eWWPmtCzF11hz5Gzp7xyaNfEJYS6Dk0SuBLllqKz52WRPX3x6_bauWzbx3nbB8DZ0sPioL6lgXHLUaq8VX7UpgCImN4nHyMCaYoQKO1SW"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=91104115acc42d14';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\/557057910343?__cf_chl_rt_tk=hd4v9ZGoMNqMF1Om9AU6QkJq3HhVemyuhYOC5rC4dx4-1739401849-1.0.1.1-nt5Um_CuvXOagvv2vL4An7v6IthyXxH4kOHtf3hVdi4" + 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