for Atom and RSS and KML
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.
<!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;padding-left:1.5rem;max-width:60rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{line-height:2.25rem;font-size:1.5rem;font-weight:500}@media (width <= 720px){.h2{line-height:1.5rem;font-size:1.25rem}}#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="360"></head><body><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: 'leetcode.com',cType: 'managed',cRay: '96d4626c2826db71',cH: 'u0CUBLz8dyevfXqPubOEDp98dBSFbrdJ9D0jacKOXfQ-1754880196-1.2.1.1-eHKM0ue2FJfPdL4HGCmNkerrPr2dq1sp4QdbJUOgG8cWjkmtSjCOUvhTuFOW5xRM',cUPMDTk:"\/u\/mfdltjtdb\/?__cf_chl_tk=3QDOiA5KZbucA.y1dFYnMQad9T3jolwnJkMeGb1d58g-1754880196-1.0.1.1-ogayS77FEP8RueT8AuvTRiZKWWM1e_e8dIgONpz7FuE",cFPWv: 'b',cITimeS: '1754880196',cTplC:0,cTplV:5,cTplB: 'cf',fa:"\/u\/mfdltjtdb\/?__cf_chl_f_tk=3QDOiA5KZbucA.y1dFYnMQad9T3jolwnJkMeGb1d58g-1754880196-1.0.1.1-ogayS77FEP8RueT8AuvTRiZKWWM1e_e8dIgONpz7FuE",md: 'hOd5yzoqR9pRfKYSZYvSGpM1kSJe_RBk3RcKrs1a6g0-1754880196-1.2.1.1-xDoTeCiLS0ITeM26UYjs_BsFMt8JA2c8tyGO6BI6RniksyGPdd9DBzXU01gW2pC73JcCS1cZnUVcdxLmaunjOOaInT3vUIpnpMvzvPV3XuC7AWiEW3gbS1VRbGdNjbPVGpwgkdzq8A47tdMxwGEOmeIq1FojogngW.xg5A_EdfZHanCjuxEt52vzGHE4i44wJsDmh5x9IeJtlKv3MgxmdKw1gEed0FDR3hKFwdF0dtk891GexgyJ6lnNOJAXQixEC.l7Pc45vrSydGuCWw51.TSiQrZS3puTHqhbMTdOW7AqVztL3py8UWc2fpFVO5kGiK6Jr40E6lmAnvod5Nba8QVWtreuCW_7Hi87ZpOHyJYT7KC5pt1eo5Cwah9e6UYuEWYttbD3dgRP3Jc5YIxHj_l8XOO1AtFPMqbnmMTZUu.dbPoBTdqhxI.ZABrA9fnkdIFECiwyaBxLJufz0Uova2Vcl4F7U3SEL4TxEp4_1tpNjzmEhkJLFhoTZfwj7eWgyEop_WYyihLxuTE77fIk7eVLKWjKiBZdZSqwehqtON6Vb2sEeX4yZmv_GHiKHHW65nrdHkKfdeG.Ebwqm5S4tpEnYEzp0IeULXazidIsB1RpLdzAgOqXdl9XSQZSzxPiJy3nJ4l8BtmMAsti50tOVL.E4Qar5vYRjZLl4dddV1teXkrIVyoFkYO5YUiajtfHPtZXQNvosCUIqDu84pc7ZgLQj_RX4spJZjpKeY9PP1zqyT7ccBuEx2hlohLbJovFRyPsoSdDmVuGPZXAYywhaEImuDqL0sOzV43iRdKN3fzR97vqdeALvxX2mUOF7TTumRZIQSFMMoCbuXafBIkcHxp7kT0GiQCif8KwIgHpoZ_Xz2dbCm7RohawlQFNyxItQO1F.vBrTwE7dj49twNAkzvqnYS7r7NLwrP8sPIlDW0',mdrd: '5JOOpRuhABe2thIcI5KTV8B3p2LuzcfCqiqoK7F2gZo-1754880196-1.2.1.1-F_h7I.CJ7w4bDhhQltwckyO9elFQH2C.d7nr.n.GEsRzMmZFic3pgpeo65SeStFD52HzVkLhFqm.YBhBi6kEyhVuLX_qNN94r9tikGuCsZAaL_U7UMRU9HtxgpNzL1ipsHWB3rahHHXnkVmqu3Z2InkYJOaYHFdHbY8X4anVX8IjhNLgMTboXN7DJ4dpD9rFVVCgtqc4OFT6WkmD1a3.XP9paN3jqEfvf1L50Qc9klVC28nKA6qeWctaqVZS9pUfF3ggNsx1BuTsG7FAKMlOOlycu2syw__1J9qOk6yfepMpeD1QBvQwmgd1m5rb5ohQHPvGw4W3wuNRKk_19uYQQwlFlKopV7zcfB7yQMDawnyN.RIDQ6BLaIVvOcBYwRDNAK5mFloMVTNoTVpb4QxJd4ie.amJveZAekYxLBDGFdoW49fHNYC8hHYTk6ycldb.CghZHNl_4omOt43rHq9VTYE.cZh0LBaHiHTdQurUQYUrgmeX2lR8bm8u3Gdu0GwkeF3W46uqGzC3M7WQ82KAzZzsVfjmWOVirPGOOod7jf0V9rccUgnIEN.1kP1SrKXrRrFyN9tmh4SILX3PE7F8NFgGSxGuIoa9uifVzGDu34JSz09_XGYsUueErLeWJnw0ici5wriwKyH5rnS5yNuUSAvYPunJuUHYgRhKCaVCiiSBQ6HfFOCmLOcvxKtIre_u1aEHNFJGNjVUJyOCWjeQfnq20UOoENMd_Q.lnCzxzWsZi9yJdIYvncGvW2kAXw1RAlCQtG7k1Gcv6Xl9eUMqLNcNpylqvkm71yTzqHiamV3ZO7K.FdL5t7WjokpFBhGhTlOLY0T_dservQ_YKaDSK3eBWylzTKKFINzW0nA4nYdvUAeCid8khf6XJxDj9qIOaTzr4YQ8HQ_Ir3k1_GKcbk4a9ccW_rKbeMpGtGhOLSUcfRjQEN36vYzKBdoev..z6DB6Z9ZM2KCHxqgphqIOKcKc9Y9FIbD0etsIUgIxgCxs9t9ToZQ_JM8cwfOj3MvTScHWfYnRIJo_.Znj_lh6pLt11EXW1.VUKJpzYNoVQE0.R.RxGYGbPduLgId6xKJ_md2tEs89ygI.dmjQVGBt8ce.Sf8V16wW6CmKuwogslIa150lVfoux5TO1jOj8tbU0_fHfQk4R7y_4LvYkLIiCXM7Jy6fsA.3o9dFmSTrrPcetf2JC7yBDuQooopAK3Wo4rpmvUqvdtPBYRN0h0RuSDkhZfamXXgWb2qHzf5LkELcmloc7J2AFwsQS3NboOHN10KNtAFh8JdiSHGGlO2xUHagq0.BOgYIz8EuRG7FpeeYNTBRCxUKJWY4.ZXV3tNeMDgR6PloUTDVI87K.plJDhP2lWVqG1MJrw9ygt._xqV8gr5PKff_i6OVy.dQ97i5DYGE29PfntRml8lFsTDtdoUEgA3Zh26GR6g3ACFKseCypAbdqH9cGI8SlpefJwbLRsTq5Qq4eCPdWO2VsqH0E1S1M.IIksjkHdXjathSaGerJjXe1vBVY6zuclFFRI5xx8BYcyQXQXQjuLA0AukI.DVPieOcQzFkK0L__WfPmvTiHZsIdzqpkjoaoeekMZ_dh4feEwjDSMksUTSoAz2N6nUdbEntZOwwD6KTUt6O.Cmo_QSQEY7LH9cx.pNfmUvx8NMXUjdKFM3nhDCNbAQIp3AqgEepVZ7VBjKywJuXnyZAC4fQSSaPReNzRKwumN7.9xdPpUUmq5axcIqm2z1HQHC2ZCdY0t4QCub.OuVR57SVDw1mv9H_cJsD_jmzQaaweiRC5HvMC8NwWywMlKrFskoQyXsj9gy4eesGxZBVJGZXYWFLYBTeUdiAMa.s.5Ds9vFl86IS2wKsIAlFggFLLjFVdAyRg.vlk8_7k_zoPTk',};var a = document.createElement('script');a.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=96d4626c2826db71';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,"\/u\/mfdltjtdb\/?__cf_chl_rt_tk=3QDOiA5KZbucA.y1dFYnMQad9T3jolwnJkMeGb1d58g-1754880196-1.0.1.1-ogayS77FEP8RueT8AuvTRiZKWWM1e_e8dIgONpz7FuE"+ window._cf_chl_opt.cOgUHash);a.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(a);}());</script></body></html>
Home · About · News · Docs · Terms