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-6420158397-gov.caltech-edu.pp.ua/post/6420158397

  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-6420158397-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fdddf8bb760780',cH: 'apY_JuxYwEZhq8MpAOaAl6_8Q9lVMWSHMBhbxbcmG8M-1739209045-1.2.1.1-2utmsZ6y1GkzOsIfGtXtu7_C7oWQw6kYjXxKSsLPN7KnqLrvoZRFYunwOwDz5VYF',cUPMDTk: "\/post\/6420158397?__cf_chl_tk=xT0RrjVhqcBUHZEVdqL8IghPoak6msLmTzGw2i8czc4-1739209045-1.0.1.1-VB2DKblvj4pPXDgEeZWk4mkrU2ETDfwUCHeiUJFCEo8",cFPWv: 'g',cITimeS: '1739209045',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/6420158397?__cf_chl_f_tk=xT0RrjVhqcBUHZEVdqL8IghPoak6msLmTzGw2i8czc4-1739209045-1.0.1.1-VB2DKblvj4pPXDgEeZWk4mkrU2ETDfwUCHeiUJFCEo8",md: "j8vj0dK5BdvdnlfCpEGN7Xyq4AA_U2kmxjQx3tH2_DM-1739209045-1.2.1.1-0YG7F_oKsgCpZr.wsuMaHbruv0gerd0qsbW30w.YixPGlD6FEqfpBLbzznjBTQVlSbZfxTTjr6cKaFYWA4pYvYOPs3voY5xikvuTHciztWJ7TFN4eiMQOsNeaj6y2OLla5cMgax08LNfsiD2H1HQbKefCR.2FAT2xbTYW0A8E6nApOmHT5I0sm5ruE4rh3dF8jQxUKWGMmoQ8n60uQhxbSWPnELUmoatNoFenaceR.0F2X86E52NuZFUNecGAeux444M.Cy1TVQUBmurQNZaWqz5Z32NHRQEb5CIihJFV.AZaU9WA6WrLjH6vci_O15D0XGUci7FiyvYlACJtyy6z.lxP5n6092FdVmRoDHYD14QskDY4hr8v02QfgNpX.aqXhRY6uEjBSRQmsWykFbQot9mbKc5sc5drpm7XJLroTiGH0twPjMgiXGI8Az01oWsP3JtTtMUaE7P88oZu4Sv0CG0v2DwytZnAIi42C_4JR2hd9BU1NE9eJd2YajAyLtkyWceLdj0C8Bgf8wOsstoiDV7FX0O5HnZXlPGh_Z6cT7KaNLOvDbecprCzTwxLDKed_7UBJ886jHzJsBpn4MQRPmVHp.Ur70TVmvH6PUuhdiqZLWCadNLkHXeBAffoCikUvG43J9g8bNaWqGo0dPGYPqqe58gMhW8P6ef0GrBl83HvVJYcoyhaRfzHwuOkcI_rxtzKDlnN0wBsmzF50beQMTpPTOKHDSksr9QRXZcqZWsa79eIiHsQ_QJvvkkEPivmQ2wX7GL6LKYZSuQOJJ1uqgbmyiySRMF80BXku0d7KVP6rw9TsmHM_RW8UF0f46ZVradqoF0qfc_wQxIA2MGMXRoIfUQjE8grJp.47eovvUxXONfJkwGdFIlszN3CBVE9HFMHW3AYgGW9zXg8DfmxAy.6_5eH5_zRhztBgUvVrdcossD5MBW2.EGAkMAcibtZou6UXtekj8jsE5uc2jXqLIiZ_G9Dau6MSGVLHBT74AG5kZbtsBeNYOgSHBkjksA9_iMSzUEshekRHdpswinb5v.0IW5dqStUOCxb75x6TZ8QLOpVGsLfIr8Ote0NTDshD651VBHOQz.byAKOQhYX_8RqlTkorwRgPCAzG6p5ZziGxf6XhnJrtxRvKNJ5VlfHEdzVbFIATq_XiAeEbzZayb47laZV1fBHAAlutbs5EZ78NtNFaCSa7rCTYtEMZrkuGSzJ2TF5B8TfbQR7s4etmBKpp5M_MN5IaqAgZAhqlzymWrF2bqNgm4qZNQGb47Bcx65vXMTlwmCVgWsKcitog0V0NdHRuDXs_QuWw_vfeb7U4NLNPzNr5AlLZkEfMlno.0R2yzulkOr07YRbbNa.vS8d7esvqI0V52GzfrI.Y0Jc26QrlPWWdSqhj8ZPbcwaS9DoOKvz0Z.epzVzL5YioIRJ_ZFstE6FDLK4iJw9xPUDJrZiVQMix.3B8yugxmG_3gDLPwHIgL3uS60H3YWPUTb2x1JbHbYrmRS7sX1WPH8k_E4.MXTX7JtO1ronexd43v9gCtMsIPkMM4tGJd3eVZwkBaH1cBxqMQAuawVQEX5CK1UoXCRNS4Rr14S1ZqDHkhhDYCk.2TziK0oscxtWy48D1JuHEqRTzHNsAd5SnElej2v.ImzQSSsjzBzPPprqFCNBpdtam03sMKIHbG1NBPrW1FU_dddiZTHofFp1aNKwQ3QfzgpD.6ogDCFCElg81kingZrK7IbjEhsKyABOxgzDQ5pB_wcS5jDJB4A22GVpJBjBQpbIBRbV4GyagI.XIUFwuz2_Cw9EhTJVFuRigXTv9rzMAuaW.S8KL5RjRvs.sL3Q1CCKd.Z3TVoPxAC1772Ad_WoMikcuj7_tiiPmMNd2lO_fWFRankIXC66cjuk8L4JY6M5NyEGEcPlBJD39XamTlIGz_PD5WojP0JxhnYzeaU3Q8pSlb8A1H8UvSZDNXXmryvAUqe1Y88EZm1lRedQujuM9rg0qbhN7xqsnHkSHQLHTkdKRirLtFmkf70dtLOwPtvJntCOJrUv5PG5IRFbTIm4xDdteo8F.ntc9eOK..cM6MgrDCLKqvlRtYoanYId5y50JZPxZxi7ZMsUdroMChRTcbLm9WLIr2vk9eCWZle15bGbur.IAv1LN7wVGGg3rsgXf4nWN9.AeYs6gn1PqmqzMZR8hNeVvvR.F6po5zgyweD9_T3e.4cklyBTTFxEgURsTYNxlWhFB49hLoflpqfPkz9hldD99L5EQ",mdrd: "tYgJ.QeAnSXjsJ_xPfZSpCFx0p_EqGu2903ewSoiHjQ-1739209045-1.2.1.1-c0ztRoX0KJTvkQIr3Wv2PxvR5rA2nAFWDgTUcXpFlvGGlpLwLEeu_1vdYp4IOhbTO4lkwQEAZ5MHvfeAc2IrozMFxgn54tfkhgVHqOc3PrRpolL2kQfxBoKpwU3V2xM.lbpOsIPPp9bss2rOEZ0_9gRfeAlKDoChHrx7qDtu6gmolnVdLojIs0MypOpuN2tYL_UkGeTObGzRaqNvAQUj2tHIhq7WDugT.d82ykjGUPSvkzCRlbGv9UQE4zd7KWOiTVFlRsSUNdj_bQvXwHIyNFkZCS4PWEaM7GWZjyJlxU2JhraDdUJn0okkLFWmSkjL2KhIAOhy5UTJMAcjs9XE82MF0BKGV29l2ti6xJehdA4Vl75LIPN6wp9EDIjpRQuoRtweVnA_uKmg.WVnHWn.RdVjP4OTs_AuQqgP2qBg0wFb8UFBBcDipULeMOKYNnp.LfTWC9YOj7SkxLAk70ZljoxK1YRxXoUoFA1z6b3Re4MamEZxoSwbAT5BGHbdyhjnPIi_STSr2cjNHnRiwsJcslKMheLtMCoLSk3ETVw2Ef5ZM8zvUaLifYH720P8y77a2mWP1dRRN4dwm7wRF6sbHg5v9kjTSI3X4Yn6hipbTd0BP.tMLW3xxjK9YUyYb8innogrjqVQGYcsOmSUZszBGaGDVWLJY4E5Ni4hv47IfDJnFKm2jdrew0jr8V83BTyb2UrNVt33LeIsxhzrIjSS0oIvCurOogVeVQgaYOl7zhhmdBAW06j4DBoYY7Gz85vlRS9dSE6efSNj4Yj4Nwm9nqHdptFn.N7vDqCdWTEfJZGJgtqc2QOwlkKpVo7OSLNxE2a2dll1tspv1iPz6YfY5PovZxyZyp4EsXIA3tex3hz9s8zgtCHFoxgNRgVm6xeTPKChtIxNiMPBRnRsHc6wifhc3pwK_R11CUSAQ.gAh42NcefjCazB37p59YqbaF76NI1BJgFfDIlY3y6DpV97hBU2smYeSR7wNDIpRfKyKepQNqNCCCOvUfgUqA1cach72SJ_WDs19PBsv43yeZVreHzesvrA12WNjrwC6dB_we4p1w..qxgjGSRbQfJgDJAL7twovQ6t86ZOMAQ01IQJMAuCcaXYNbOuIoBAfPdPCTCknpIgezluYw18IAQFcsZAZpHJN11UfT.5Awtc.KjDMSTdsV4lNxIheC6reYEJJubEpWAATJUlncN5R6My0bp96bFbzwIPk74Dtq6m9Jze9a8jjtXpl_2Ts9LCaqklWKsC1LmjdBbEvsOBTjT1ZO..osylIUaQh_YAdw6yrRUDf2ARuwG.b1a6t558O8JFRrJJXwN09moh0yWNSSmGt7TPagN7IQzGdAEuSEGnNdwwBZQhEmvW_jnZRxAom.JyEKcQHovPa6OfyZY9N1DNyGLtpqKStQExnn5_UcLs1ssEV_zrzqBTZ1Or_3HAiSmv7Hf3zmcs3bq_qbE8YVtjJIIxonRB297bD2ZlN4t4Xi39nxRm02paGHq7ha4Le0cWJa8clT2TV5JL5CqZdB7Ws33bsHterCSL_A0FlGf7Qb9kaj3.QMRaK49OK6xLKgAUuv4m1MWO7WBxwgSNfbmplntrXIofCbmBV6jOQcBBnP8zJxDNyUd7CgH3n_Q0A_lGqBTdlkqQ035HT0EaZK9F3FvmU1OZ8mJR12WDcHwaECFmhv9yPsU7tyTTUr26Vqafs6kX0DH_R_KRfE_uwtW6rIScxJs5HPknk5_efk9B7LlEc5segbtfYg8iFHB9DxSLj8GHYQKzgZma5mSQELJVraf5pouc2eKOdrYDnUbx1KtosJfJ2pnkdrVwwM5TKL3uKf4"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fdddf8bb760780';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\/6420158397?__cf_chl_rt_tk=xT0RrjVhqcBUHZEVdqL8IghPoak6msLmTzGw2i8czc4-1739209045-1.0.1.1-VB2DKblvj4pPXDgEeZWk4mkrU2ETDfwUCHeiUJFCEo8" + 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