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-1529604837-gov.caltech-edu.pp.ua/post/1529604837

  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-1529604837-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fe18be5a0d3b26',cH: 'XRrnt3aOzF_jTmNiEWd2iHCXn_DXjnbpLNjRZqpfMBE-1739211453-1.2.1.1-6Rqh8Kwa9O_h_XWH4gYXqCLz3hXvVJySixAjs5Sp52oroAlqGNf64hBRfO6s_7qW',cUPMDTk: "\/post\/1529604837?__cf_chl_tk=L3FPGSwsOzkZkzWaL2HRS8Mir9ft9JkfqquF0LoPT5Q-1739211453-1.0.1.1-QSiqBXJn0e965QGzIyel2F0E9R3cWZEqADVA7cb2QMA",cFPWv: 'g',cITimeS: '1739211453',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/1529604837?__cf_chl_f_tk=L3FPGSwsOzkZkzWaL2HRS8Mir9ft9JkfqquF0LoPT5Q-1739211453-1.0.1.1-QSiqBXJn0e965QGzIyel2F0E9R3cWZEqADVA7cb2QMA",md: "E6zaDWxe1_Q6qzcdOYdPX8G0lsvjzzqHZETQnRdFhAQ-1739211453-1.2.1.1-oSgCyC5B.TMgi3pTmmMXcR9FvgIRutpg02LKk36tgPIig9CUlPbkJT_e6BPZT88BBItl2LAWlLmeL6tiDc9ArYv7dAErkMMurWgJ7GWUoIYhO9.qTep9M8G1hSSpuSQK90mGg37FaqEqnKGoc98c04uDndJFYF_jshIolaCkwWhnUogYlgHOgZwQjnbvR3W6LOoTTt40MKCt3gMABzo.HU58UzLSCpvbJUyRJ5Bqh_5uWtCjpBnRXQOhA0f8xoBefmcX89as0YhTp7QqOihSzO5auOfZ3MV91MnjmdwJix3F.Y_.wcaac0WcBGj.BlFMZFdxjgIDNmsIfpiRVw5lMbyHzHcdpVbTaJ7mcJlYd.TEoKBy2RdnFBkv481Tl4IvbqLHbfC42FhJWTm52K3qNCfVcH3.rOqeMrbFbzd38qjWTot8m79Bg8xNUJsnQKv09Bw1dVkG4.EKQs56RSmN1ZeHgR8b6N8hkV53cn8qQgNmcvOeHfzhlQqGHyN._dyu5Z1LwzilGsv4JmZK.PfEDHDQy9YB626G4QzLluPaF0XH5R8kgcM1ngd6gevSnSOENuoVqSSS1rqgLbqIkfXxliD6LOeylnYDVYDe513Bbndbr604MWDCG.tEBndIYuDiAp3pRqngkoJEbMcFpuyfI9fyLlQXFfiAP3PDBoGsuUtBCRdtG6y1C_UG5CXL8Rxd7kqD_dXiYuIq3Y_FJt1Ur.rJg82hR2Od8Qj2Bl.gNRQqkCZBhfjnvvU_zXgKwhSHkszec73UE5IkNlTNSB_yax06yAbla68Cuf8hmGJ.c_i7EmKXTdxSNzEtr3he.LochKVbw6Su39YmY1yJkWsf6TczgQamZ9f3EvBzL063g7CPgZyQj1RDLZKF7rov0FKfLJFQizE2pZ3AbnPsAqtXzos2evw7LGhzGT1FBfdsOICDBX8pB6CjMqJfOW3QgNRwioJBvuZlxTMk0XIp4eVSAuyaNop67dgbE1sowdC.kRZm9G4NFwfhiIXAhAvCcsmmip9NUjhg25LvPMqviCIDsWTCYin.7pwfCDKuu5S7HQmUhGKkdk9VolKsf83ohzB23QolThwvurrCiu.d.sNoaCbVMv3LPC4UVG8aPt0aoKqInEf.WRBzwc4OQ0gV77gYd31EqprYWnKmdsGuvT2FSrowaG_ORayVtYM6PZdVezzX_.djedutDtg_cL8EJPRyBoT9JkiUMKFXmv4v7KSZf5X76eVCQWqiogDuj1hmboN2hISxUXaVQk_HnJfL0rmXolRtCpJSM38qmzJZLDFAP7dIYR2ygVCK8XNVHLunfe8AjpkrUr43WyKRtZ2or_9TgNXQ7mC6B9r0gN4jNp74jmryUioEFcPs.OYxWYh8Vfdsv.Bbk0SBo_obzoE5V6hezBMdmalnSU4UJpazhAMTk2aBBv05Y1kxTzMMuWSyVLAgQrDe8NNNgFFOpWpJz727d97hL3jnkydIdidp.Qb2krEI88KXNKzlQoeZAujB1JQ8g7PQZNAuTx0odAQsPoud4elCLVyyGifKTzdPwg4s2EFHuudLvRzRZdSIsR4wLQl7Z19nFgU9dDMMlRt6fastTG7mb1nVVNlCLrpRYRVVdm.nXE7KqcAiv.NqgFqQEEKshQtu.H4lnSglbXY2FWR4aTrO7z_sq24clhOIqcNLiMoB2RWrsiNDoieRIc2d4OvgQKtaMHkBKpnAgWfYR209uJPYmdSj_iGvjgtoUtixjXB0XHMG0sqDn.OXR3o1he9__v8KIJF3MnxDL9Wv.ddylEl9_NBDU339B2tmgp0FRorLh3kBpTlryobNsomrrP5o2d7snjL3cTFOHL9JPk0cLpvrc0U3u35yh4BTG2Ro4DefoDKN5RCPqMYUJtXMm_1O0yWHF5dpaFRjuGwCFNx.qc.kdVC8xbhNcoaZCiB7iDUV1JUuqgCGaQgCMCUBsY_buduaNMBWra_X_dZp7hxIiFryHotDAK6Afp4LgEiSyqei6LRCOyb4JBj6YiOuqtXzJbyFSMER8h04Yj3LXma4uNnEV2w_C6DxPZTGjz97mu5mciL7HQcpmfPC7SnzqVSWdZI2vqr_2a500R3XsuXb_rQeu9xaTSDE2ExXzpE1V7WBpYeBljX39kLRZO2CKXxb_1BtRdvxRC8YDV85DPctyet808jya01vnQLluzcNNt9mzZw0Nl3t1CY2KuSoBYc_gj.9FKLMCHk.ZIdgwmaEGs7OiNvY2GcsyLCDCemgAA",mdrd: "qmP.vl4.uQy6PGUNm_hCe3ltt8BBjnPoAtOkuV8zM8k-1739211453-1.2.1.1-T1sPJjYHe3rft52DXE9e.eXCO5qC.EexjL7PvhCvuEHrSOEkDKHT0IJsmgIDM9VbClxtLd4nb4RKqoJvj8olEGNmCGavpyhctYGeVROkPNq2flXqN0FRzkx_bA5KClUjjPU_3Z3wus6ruW.Dxqhw7ZDAoy3pic0uIFpjE3qeExU878ldOiTfqcyARmaIzBF..Vo2a8iV4umd3CISq5EHnUA8DPLKqIsZMRCM2fiJrd7241eCqIORgZDHgrmxH8EFhM47K5ht8Rcw6wpXXVC_uNRmCeGyVVGV5iR_6X_YpN5.C7DCOQbKbtDPKVG9rrjYn68g.Jcq_fUBSkZtvYPSxwpbNkOrIhJguXxPlkVOXohBmsEEz6ZsciMy7XjFm264gfg6bFAteCQIeswA5kO_hofaDvcpXMJmqUTF7W89tdwXRRCuqIa2LaueRDd.4Rnw6lrA6EYkl88dkLheG5EWbO4P.xwmXfuLWTI7Vcssc9lTcQNijgiYI.xffvyeQBS8qpVS0m.QlwRTzVpJwf7eo0CrTmZPCzSkJ0bc0U_HGPMYK3OVYaDExEdksoWsFd9KhkcBI3fnSpOW6Bspg77R_6mSI5vpZhX9IGjEzurKgKksXVSiIFYNWRg8iDmHaqBPN8LC6WCeg5u8XpYdoRO7xqMwTTpJv5lePPGEgELbxqTZm022vMKa9PwIVhOwKQlZ4js5taVpJlG9lPQ0S_aA.BmfWcoddAq3BdrcWtIW27ZvA_3MndnHIquYdZRys1D42X62WlP15kdgAsLBD3vAAZ63iYoxfpFO_GWRWRei7XgaGZaplV.jDU2ZCHq.No.KD.dPPzp.KM1TbunIDmYBYYlJKFKoTCzqmzWiXfQA66DTLWSqO20QXbNLAYfR18FGrQW8UcYdN356GPAt3d3Vaov2mSRCUuZvwlUWhB0pvi4MPMlRnZuXdENDJom6jipw_x0FKLsv4jv.t6gZGBPqttvrwlsSrdSvfOzTl.CLvTuQ2n7v9243k91bjxiM7Sec8IoDfNJtiGGeLEaMM1TyeWv5cBLtlqvBG4sWuq5Skqax8P7YrG.JTnIUBEtAlGG1pgN7g8a4mrmTV5sjRGx.XO.lYG06p0nzd0c0COQrMth7Ofrx9UKJtzIWi6eOiavna8A8j0ByYsGF_uvGapYo6S.sCp3Qwlghl8qGLOw9jeOSVkn9bPNXQ83PypOSL.6wXad80IxXDEv9hJe5TUoECLv5D0gobfSR14z8u5YNLlWPLnOMHZVtFwvggLSZYZRnV2xqUx_NQhbOllkhxweF44YsS7DatTKJVEb0uQ7cP68t_9vSHkOdVcjd0Wcwj0eWsXB49LZ0IrcBLp4Oqr1Ydtc2jYvFJ1UDPF92VMS7uNxrOJeoZEMAfuBQlEpKY9i6pyMMEDcNbfE4qZbIirZ318UfqqStqitFSEivcPZhInP1ZCHWMsVlEMVz9xAqyC37kcMf4REn2R9r6P5OK1iAJgO5MSQjsKY94fQMJR_4mvwTHFgY7c5bRaqEPbjEAvB0PJOtDpL3QbEuSN14h_gg3Q6OsYZtafkDp70Q7MrDj7d4.9Np3ZfaPTwyN9.N4yQICrTidcClPFwlew_AyymayW3.hYOrVakIv3eHxb8Uk8kcVJv7pf0S4.Odud..mrX7NwJNP7UkhLkaBalSvcY74yA6IlwnFd.t8rQ3IAx8.es3vA245AVA6zTF.noO7KTLHvl249TD9EClTQbk3ksnVUEuk_PcbrGlrGKHbyvsGNv8Snzf45RYNdJYia2_XiGLm9iGSki0Fig2RzumqN5fr7z.CctTDizJZqbQ1scipwhjwvjVS38tzP.FHXxCuvyc"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fe18be5a0d3b26';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\/1529604837?__cf_chl_rt_tk=L3FPGSwsOzkZkzWaL2HRS8Mir9ft9JkfqquF0LoPT5Q-1739211453-1.0.1.1-QSiqBXJn0e965QGzIyel2F0E9R3cWZEqADVA7cb2QMA" + 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