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: '96ab411c7fb5597f',cH: 'egSKDDNEsrAi0JC_fV69gX.MWUvSolZRovo3_A9EcXA-1754448915-1.2.1.1-XMvvtdYDyHlOkVQzTjfiUnm2pWRK6W5W1fGFWeRB4N8tN8YHF9ycAOfYCVQnOSQF',cUPMDTk:"\/u\/qmvtrhkgn\/?__cf_chl_tk=ZbUudVZYVjyN23IlnUNQxGDZDOEhOWOgyJBAAo.BJV0-1754448915-1.0.1.1-bJFHxVIQSeH9FlKd7WVct_F1L41UBY8hqu3a3jkHJbQ",cFPWv: 'b',cITimeS: '1754448915',cTplC:0,cTplV:5,cTplB: 'cf',fa:"\/u\/qmvtrhkgn\/?__cf_chl_f_tk=ZbUudVZYVjyN23IlnUNQxGDZDOEhOWOgyJBAAo.BJV0-1754448915-1.0.1.1-bJFHxVIQSeH9FlKd7WVct_F1L41UBY8hqu3a3jkHJbQ",md: '_IdFy.A1TmVC.Lb49agtI8cC4gvwt4LvWmI3eifm48M-1754448915-1.2.1.1-A_NKguTdRru6.oceS28QfctZGb7OeC0VDBvdshvD2KplujUsCc8UWCphkpwxz02cG.8C41sWYIEA392j_vfyy4PeXeKIN.0588hBgN1uanhTNDLvqBVBf0IUYJjtJdbSYWdLIZKewg5JPQCF_rOSUGU9UddJLs7xmoAJsEfKxXJLcWTzyQBXPaCtpQSH0_o8qkQ8pNbjMszPTcky0vY3tcLV1XEGHBmyNPELICYzsECu9Kd7NLHHEkQ0wuoyIxh4zSrcSly1t7sfBaz6GNpi_Y7RJZUGL6aRHSsNGyjSBvr77hp3heb_bZU75IoCKiZWhg2t5ngA0pi3ty8_IO3rk7CQz8LlanQSo7PxXTfgrYg0gCQlTHinLwHCEY.BSIcoH7fGqNqx0.m0fcLmlQ98ncrwbP7G0l0Jq.7h_1MNVmQbsGX_8bXvKMmj.nVHEjonxy5QAFdoCE7IsOnh46ctkVt3mzwOQnmVdZ.r6BGBbDhpeHWfB6MuvCL3haINpWFWyFrlEDEBFW2gYWsuoFu_vSqEj.GeuK8xGFvKHxzTF_PvdkOqzrohd2RYa772b8OR0NcbpTWjTfXBai2EGp3xaFBR6ct5MLTCCoHiRp4QTxC6tqsprssquOG_DeTy0Hgm8p1dgU25tkiDcYGTYk_Um4gqBGkO8L_yJI0O0VBZGJIE0rrwZc_nHGw8J9YLC_t0FjbIzZ3_Yb494g.vFRX9zHKjKoT5DdNvXrrhSYg3Q7xqnsCEELsdLUCSXKqd0X013OroHZllg_7_zNR.s8q.cixZOCopvmkE.Ef6hygVbF1effdJRVjcF5y1Q.5PDiBPd7xfNJqW21.icXU4618H4Klrt9zGByccvQARMY6.iJ39VxL0funuosd.qI_3q45K7jtjCFecGtuNyPLRm57bE1f8z9KAxqwZ5F9sQ8eaPIs',mdrd: '5BxuhJ7EIvw1sFJq0zqbkk9qUrRUxSqawyw64Hbj5M0-1754448915-1.2.1.1-8KIzolLD1Ze1UDp2osKNhQEDukfjkzw0NlfubJKbWchnoRIZMyJwHfIOrZsKLCddyOu.HOwzzm5gt7hpX1jRuurdHqP..Hw6mv.DNjTeDwNe5vyTs174ArGNy_sJdMMD053ljxarEUnluJfugImNMdn341NVHVSe11KqYRgOFqDv0sHw68AsyJP72a9AsBivis3hOVUypR1an.9AprEn6NhoT6YXn4Y1p2_gX78s06rGiGXi2PvWnYb3Ro9RkOKswoFqfZqhl8cEx1FD14uQDDeBqQEauF3PHEMA6hKw0a5KwnzFzJugaOxFwwWe0l2YFGOQT7YuZuR07OVk1MKw06JjtE5t_xxzfgjrcv1F2sqcVgam3bna3GIKTJMcpmg2MRYii6Cyvj0PDJRWq09ob96MkHgu0OK6aFc62ZXoi8FC5Z_LaIeYPz.P.q71kIf3ao35uM0kMwXrcg3b1sjx6PYHFjWy_NGi7U55c5Jn12pa9rCsokDTPwD4rbBr4WRs2Bhi3w99Qjvq_Ct0WoE3wx8JswrqGft0QxbYYxqRmK1greAbGQVHH8siLrijUoMLVU03sEunqa0FnjU7gTdLX3kpRzYNr6z6IcctcouuMzeMD7tKdy8aCxh3PWJs4qw.aIEouO48rtEHBHpXqZXl5ekmnGoMq4XB5dkLxNVkITb7H8_KTdYNrfUPJOPynlOYx5ZJ1AHDnQs8X.9.HqP800r6qfjFgMK8Vd261k90GL857rAgNi9Jn.RR0Xkrvz.4_DnxfUsMq4Pyn8HDHd4E2A6bQcwH_QdwrUJEBN8puisVEGL4YHjsIMuJ2JOtX6kTz_b6BAfhek9bsm1nEnGUnFKVNXZjMe26xPzbwlByUuBVTEex9Yk_o4VAD58QwdtDnEtNEMeI0.duGLxsuj4cXV_LGqxAOdGZdNp_c8TVlgh7ggav5GED2pcazjDns2GiM1j0YYsfv70f4sW9BUCy1w9Z5DAKusXTCzaDcXvtY.CyJZha4F7av5cjWL1fHFijCzxxAe2LBS3x.hBtCbhnuhd9inZaGhCpjODlOgg9ilfb78yLfUNpm0IIqyCKY6DltL3OEFa30w61Geb5o6QgJiFnsO918M4wxaov0KG0Lt.TQpNu_wc3JEPmdncnhsf4mv9Yci3CbOChTrFobE2040L7omILZKOJM90R8beklfHG_eOlVNF6g4CzY4coDyej1_i9fRYsn3zaWWzibOcPaZzWOCZVysJ.xDEiDTI7WgLPzb6WAJjQxsLMxKgjFLIz5QEhH6HOi19oK8MYkQf1u2l.1tudQ9wxzmo.mlsyUAg_tuPBs2AQj7ypyKtq_m4NJzYFOj016CNqKWy7UvIjeSTvzTlUwCpcKwJaDJQ3A_rIqBZnkj5Q5c.i1LHORG8gNzOR8LMclLldv2wk6dDPxooGuVYvq7rxoG_UgtzmgOJxzQ_Cdr8t1e1uTYr3gEzuG4dMf9YL4QHnF7Wjd0qBnyyyiJIU5PsO4wF_Jt_fB0MVvSRryZqM3YnGSNAkmMYFGyaoYohkxwEoraffahu0ZoWUKemOZCAXmqgBHXmTb_HvZrNSBKIFahVph0v8EdB5WCjnzL8CBNTMvwDrD2jYsoMBhnnp6Y2xDxFM3LQ2t614zl.zRiFmTiT_aeERtdj.j1hWPa3E4oep2it9dEOe32AruLqqFOoHwfnhuC_mjCC1cKL2H71zLZcYIacLGCvgJq.oNpWuFFJm5gMb2Z3cT0.l26J6ib7LAz7RshwvWkJGvYtAvnR61Mbz_TU78IVhUPWthr5RfJNhBrGNBG__grsrkuWokR.j.f4SSQD8JkdIXprm3_ro4nGe3XS859kX8seFI1DEbaOV_yOfGtuaKA',};var a = document.createElement('script');a.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=96ab411c7fb5597f';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\/qmvtrhkgn\/?__cf_chl_rt_tk=ZbUudVZYVjyN23IlnUNQxGDZDOEhOWOgyJBAAo.BJV0-1754448915-1.0.1.1-bJFHxVIQSeH9FlKd7WVct_F1L41UBY8hqu3a3jkHJbQ"+ 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