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-1723086459-gov.caltech-edu.pp.ua/post/104588841477

  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-1723086459-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90ffca885b539c46',cH: 'Pql0TVTBS9YahlR.SreHhvk4VplaI5WRBj1v.tNAVIQ-1739229221-1.2.1.1-_KSnDdsvnzNXj4fbP2K2FBzZABn4h7Y.l5ZD98IwRqyNTe0QIbjrJ3dkHTGF0ZW2',cUPMDTk: "\/post\/104588841477?__cf_chl_tk=LRMT9chs0zBt1l2_7svQ58.TPaJYKq8IKEr6HhIPiME-1739229221-1.0.1.1-xCMiBSz0PZDogXxUYhhu4M0wxGn5xNVY4__ArO3ddpI",cFPWv: 'g',cITimeS: '1739229221',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/104588841477?__cf_chl_f_tk=LRMT9chs0zBt1l2_7svQ58.TPaJYKq8IKEr6HhIPiME-1739229221-1.0.1.1-xCMiBSz0PZDogXxUYhhu4M0wxGn5xNVY4__ArO3ddpI",md: "ioReNZDvENGL1ITXMDXLELbkr2JA_gD_bOrot9FXWKk-1739229221-1.2.1.1-vd9GIQqIfRVhZZ4iUA2ZQloBFZVu7B9i2H1ef8L292eKghwc_q.KYLxHNfOf6vN48wyOSpfhlOxN1k9WBDDbLUqf8uWGp76pO5UW7rUcyKIj.hKRBKuo74nNkxNNxaRoKH4uY56HPk.SOqeNG87mmCXMwzmUneRfkK2iEJIAYOlQ3zg56iSkW_q9k3_yvUecxC1jMgCHt58QgtT5lcZ_lcMJVPS8.tLxtLyqzACO011YF.oHARds.82qkYRDe176q67OZG6704SyPppeXBcEOH9w6VwlFPn5FQ9Rycz8nKq7TniNSPbYBpw6XmWrtgDgWk8094V4gofX5gasktcEkvInq.Gd_dAhfzqaOPPqbhiwhNygKBJ5FUy30I8CHd1rd7nkzuOsnEHmkyRJwpb9vbwBdXqI0WePc2wF75jH57kB2G2Ydi6l0pZL2jyjpyWRlUrGKdF_4XOk4MJssOq_YMA9QcjBa7stH8h4UUZRneQ7Brgd4LBDBCxdPRe29OQnms0PMtIsGQrYt_iFO9nXk799OlXrBWrWtHOUzIq2O9jd7VJby8mgIui5Vap5a2OZ.5unQBFDZR5TTyjeM5mdqxpUDgWikdjgzDboTAIXrn70tlJdozZhe0F35okX4BFMTtM0ybSGzSRZ2mgkoNjftbsyLNw5P9VquN305SiAhDcjP3vMw1UJobwBEySN5h8OVlVBBlTplaNZyv_Sc_qhMB7Yiwi5OheP.suX.JzJmQUwnnVdduT5uTmJuaaltpVLnLAfiDwA7Yv4Zi7ZdIjB_Gk3B_7UGa0FcDH3WwGKp8DLPa3pS483bHDW5eC6rnVyS_AZOMisuCZ4Y3vqbw..kwabZcOPN6_oBe7wpxfkt79z2AKghQ1VxVrYNHFqVp6Oxw_c12_QSk4BX9_hRjqmITdqR8fhyzq03lRPla0jjmou4jciJQ4p63uPOYGRXptKcCrqPiZAFIfbctaOMKgUulVcpeAYx6RKvyayfN5L31wkps3GWFhtbsrk1iw.POQkkbFCa8ckeAY9sLhP8csIsSAjMVBDkbCGI9DstdGGUEcqHP63VjtrBEV2PKO_zbrlTuKMauA8U2vLZINWC4iyoe1O35kv9yzuS3.I9kDiGV9SPRDS4LA8eYX8kI32VpN6zaA8GRFkdZyjVuLSY1G2VDAlR7Mnu4dmFsxue_UGk.HKeJVm_8D33ecwQmL46EYUhQ38XE3qsrl0It33e_w_xFLk3sJmxtRNAp.EU_fLoYvD2yYs.ePYzxaD8Av7tXUeCujjIn3CFY3cF9FbjCSwwV.rtgmS28DCnqSDuIzT.VW3JSWWKFV5RPr0iVRfvNV888GXxV8ESrb_RlLkshkShUxBm5abTfsn316KY.9wGy4l_aDqkEsyWmymMOg1HFatnuvo6mCIxl33L3uiIRMFYPbKhrkl7JOO4P46o9UDDe9OB0t_Na2gUFA88yI5MdCcXRr0jJEs07AiRy7etr83QAE1TdDVc9llmOXIFg72YEZoIzh8iiL2sRZkkM_iSOfcgFPmvMiekqIDLsyu1ctWPs2vqHl4QDTlQfu5DzFB4c24UMeKpHkBXENBgT8rQmVAU0SmphrA1IvoYGkm8JNESgfPzrBM9jv8dVjZPT1jvgV7JpGPtayMLlZUMlvtfJA28xgOGnFmDrKyPnLiNKeQsKw_IjRqUcdcPEBtie8tc.akjZl6cNR65ZET1sN8i5DpHdTDFnfL26XmT8tsRpiGKDoXdHElTdSiYADZP783f1CkuqG8ttyVp1uUmiioV498yrNwNmpJA4.AtBJvjADw2gz5_E5qeTnIqpO56i0fInaSXpw6nOSh8uOgvSubgN1bvjYnyOX7THSImZB85N77c3ZYFxC2JTrIaZscC1xSRdr1ngcX1.xAVpiQLat.o905RAOFNMVQYTFzdSg.Mq3oefU1fQuNKX.X3hPbgviZgFS.xOaDQStaA.zobHI4FJzsNR46y4wcEvuNWdI1ypoLKXlMB7YRdjf2Eu.3TpVrct2xGpJSp9niqPWMCeuvwVluOGAw4UQIIPiwpImLzBIYZUsDbMTmZI1r4hzOpJ1Rl_6eeJVu5uzMZmFdmjaGLU33uik..Z6vb8HUmCQQzmuz7xD7ZumGGnxTQx2Nen1CvzbObLZaUO.b4pRZRVjikC7VCNHoHvDNdGPXdN0BeOnpxnuvNV1dUEiBcXDVUTZN3Ab0t9EGhpZsywx_seK.jm22q.lFhImAIjoMQiZNw4LhpQ",mdrd: "j_E8Iolx6TQnZlRE46PktuLpSimmjCTFK1sSjlXmDD4-1739229221-1.2.1.1-u41DtW5KIFBuMQMjnr9P1S6rStYJavTM8hR84xastzGynlzi.m8IVOfxKRPFht._bsQFU4d57smDfZ6LuIq38nAYhS2w.Xp78oJ2oqcsX6jvcHAp5d.JQadD7mPO8qVJZsR_DSsq_tk5yylcLYfS.yJIO1IBIweO_U4OnWK7LIefP_mrAsUWVxbbatXPVsRP4ISIZFhaHbqIUVPW.T9Ia327J5ScmrtZxudzNqHAe_LHPfQ6eF.Iggm8Oz55EjKCiIkomLJEkDWPlo5nCENV3Di4OZVFoG7YVpjP2LuFranjjWGcl5c1nKzzHSIFc.TO4zUcNiaHVyebsJGXT1e5W_oecgpYfjmZ7BB8wyW2UrePejYng7w9ixob.T6Mka2O6J1KevQ7TFnWu0klMrBwxvVVTBU6PB6puVcaa_H0L4zguXz9PI2WMa1xPyiFpcT4.qkNv922deyNDhzYerKAWzFRZ.y15wxs4W3Ed.BFFLQE93Vw0KY0P5_8yhxbWYy4.3EyOMx6lz4Araa3l9Th3TkQ0kYt28bdA0RbRi0iwRHXMu6KUxq.hpEgPvKZnJ8Vlk7uzShRlkVc7xCMX_0Dr_qT5ZTqNq4u3OIQ11oihT7lDWBzxznHIjPgJkLRDWWexY4rNdBVYoOcBgUz6wmdxrETamYqAOg.NT2oKHmrg8RDDnODBjta2GPia8U__Nq.tQzHE8.hvqd3td3ZRD0KFfM1TJLw9z_eAXy.bgG58cEHvr5zi1sghOpnATtC8Ez71BoZ38Y6hx78SgktkjxKtw4sorXUYZbuUAs6ZABDK4yg9wbaIaNsoTTiuDwlQ9om0Cu_B4_cea903253gkH9SOd9UYbp433eFycKOK9kjD_Bmmo5AenshTcGdznEKvGF3v8YF6lVNbZT7DT.8QXa41UYhIWhM_vHwEVgR75ZNLUa55wuZSuRwb36_JjZ81tulfJ9jgTaU3L_mvZl4zGqDWD5.IVemL7_R.RmbLUi5k6mcvZ_cjj7XoTDEHHz1Ix_CG4sBb39m_TYBqSaE0E9lIC5qTPyEfufvgQAonMRtuYzH024672MKIARksOic4If21umyYRHk3YMUtuIU2orR..wSpeAKwVwW2vsei0mXdxZMpRiFhSSYAiJXS0zgkNGyMwTqYg5CQncr8AZnGPbd2xojg0ZX1iUmHAnLnhnjMNiE3RMr72SQNwa6WMyT8ME2_6zyFXjYIo.rCNdqoU2lJo.U2eS4BsWgwULZehogOGuqrhJgLjxeSaS7mUUKpxmp5S48OrO0hShjq2n_UJrjx02nYsUk8adA8HpCvbgjM8JzkYqP1DEnqELUlYKuQIG.aN.ESd9IRcP3iw34B7A.QI2awqLrD1g5i_bYogrCYsqsSPUd_tl9ie0RxWlEKNqBQ2H_LW2vM2LaPZ_sex5Hab8fKskuXCCYG6.jIzsRqWJ6LYXm8y..0nDMrbxCiAP8GMcVQgT9.qU0Jfs4LhYz0mtp2sfNvAGG56rdNuuaC7oE1iHJv.0LIxpjyLtbeuDUUUbtavlPGNr..eMD1CCoREYrGaOrKGG1sx70arwF7s1TBZax1lMdeZK6uJwdi48eaxuiY52.vyphIIEjSEaqYQegaYGgXTqL0YtoUpqEcrajE7CuHDmYOOlna4hcxXGqXCb4hRyMoDuGXsIM8JGtn23KOwYF2l5Qi.W8bNh4zDhu5rwoWTAiPvXtnXlU1uigi9EJ.sUUJLoJ03VnVoeLW1OMi6cfJb36iMzTjRugW143qk_ZfiLFI8ON29FZzobEKMychNrv3nxV_Rh9J5pznGTW7TrWu0g4OHp2tLfIzY"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90ffca885b539c46';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\/104588841477?__cf_chl_rt_tk=LRMT9chs0zBt1l2_7svQ58.TPaJYKq8IKEr6HhIPiME-1739229221-1.0.1.1-xCMiBSz0PZDogXxUYhhu4M0wxGn5xNVY4__ArO3ddpI" + 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