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://stube.cc/category/classroom/

  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}button,html{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}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}body a{color:#fff}body a:hover{color:#ee730a;text-decoration:underline}body .lds-ring div{border-color:#999 transparent transparent}body .font-red{color:#b20f03}body .big-button,body .pow-button{background-color:#4693ff;color:#1d1d1d}body #challenge-success-text{background-image:url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzMiIgaGVpZ2h0PSIzMiIgZmlsbD0ibm9uZSIgdmlld0JveD0iMCAwIDI2IDI2Ij48cGF0aCBmaWxsPSIjZDlkOWQ5IiBkPSJNMTMgMGExMyAxMyAwIDEgMCAwIDI2IDEzIDEzIDAgMCAwIDAtMjZtMCAyNGExMSAxMSAwIDEgMSAwLTIyIDExIDExIDAgMCAxIDAgMjIiLz48cGF0aCBmaWxsPSIjZDlkOWQ5IiBkPSJtMTAuOTU1IDE2LjA1NS0zLjk1LTQuMTI1LTEuNDQ1IDEuMzg1IDUuMzcgNS42MSA5LjQ5NS05LjYtMS40Mi0xLjQwNXoiLz48L3N2Zz4=)}body #challenge-error-text{background-image:url(data:image/svg+xml;base64,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)}}body{display:flex;flex-direction:column;min-height:100vh}body.no-js .loading-spinner{visibility:hidden}body.no-js .challenge-running{display:none}body.dark{background-color:#222;color:#d9d9d9}body.dark a{color:#fff}body.dark a:hover{color:#ee730a;text-decoration:underline}body.dark .lds-ring div{border-color:#999 transparent transparent}body.dark .font-red{color:#b20f03}body.dark .big-button,body.dark .pow-button{background-color:#4693ff;color:#1d1d1d}body.dark #challenge-success-text{background-image:url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzMiIgaGVpZ2h0PSIzMiIgZmlsbD0ibm9uZSIgdmlld0JveD0iMCAwIDI2IDI2Ij48cGF0aCBmaWxsPSIjZDlkOWQ5IiBkPSJNMTMgMGExMyAxMyAwIDEgMCAwIDI2IDEzIDEzIDAgMCAwIDAtMjZtMCAyNGExMSAxMSAwIDEgMSAwLTIyIDExIDExIDAgMCAxIDAgMjIiLz48cGF0aCBmaWxsPSIjZDlkOWQ5IiBkPSJtMTAuOTU1IDE2LjA1NS0zLjk1LTQuMTI1LTEuNDQ1IDEuMzg1IDUuMzcgNS42MSA5LjQ5NS05LjYtMS40Mi0xLjQwNXoiLz48L3N2Zz4=)}body.dark #challenge-error-text{background-image:url(data:image/svg+xml;base64,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)}body.light{background-color:transparent;color:#313131}body.light a{color:#0051c3}body.light a:hover{color:#ee730a;text-decoration:underline}body.light .lds-ring div{border-color:#595959 transparent transparent}body.light .font-red{color:#fc574a}body.light .big-button,body.light .pow-button{background-color:#003681;border-color:#003681;color:#fff}body.light #challenge-success-text{background-image:url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzMiIgaGVpZ2h0PSIzMiIgZmlsbD0ibm9uZSIgdmlld0JveD0iMCAwIDI2IDI2Ij48cGF0aCBmaWxsPSIjMzEzMTMxIiBkPSJNMTMgMGExMyAxMyAwIDEgMCAwIDI2IDEzIDEzIDAgMCAwIDAtMjZtMCAyNGExMSAxMSAwIDEgMSAwLTIyIDExIDExIDAgMCAxIDAgMjIiLz48cGF0aCBmaWxsPSIjMzEzMTMxIiBkPSJtMTAuOTU1IDE2LjA1NS0zLjk1LTQuMTI1LTEuNDQ1IDEuMzg1IDUuMzcgNS42MSA5LjQ5NS05LjYtMS40Mi0xLjQwNXoiLz48L3N2Zz4=)}body.light #challenge-error-text{background-image:url(data:image/svg+xml;base64,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)}a{background-color:transparent;color:#0051c3;text-decoration:none;transition:color .15s ease}a:hover{color:#ee730a;text-decoration:underline}.main-content{margin:8rem auto;max-width:60rem;width:100%}.heading-favicon{height:2rem;margin-right:.5rem;width:2rem}@media (width <= 720px){.main-content{margin-top:4rem}.heading-favicon{height:1.5rem;width:1.5rem}}.footer,.main-content{padding-left:1.5rem;padding-right:1.5rem}.main-wrapper{align-items:center;display:flex;flex:1;flex-direction:column}.font-red{color:#b20f03}.spacer{margin:2rem 0}.h1{font-size:2.5rem;font-weight:500;line-height:3.75rem}.h2{font-weight:500}.core-msg,.h2{font-size:1.5rem;line-height:2.25rem}.body-text,.core-msg{font-weight:400}.body-text{font-size:1rem;line-height:1.25rem}@media (width <= 720px){.h1{font-size:1.5rem;line-height:1.75rem}.h2{font-size:1.25rem}.core-msg,.h2{line-height:1.5rem}.core-msg{font-size:1rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);padding-left:34px}#challenge-error-text,#challenge-success-text{background-repeat:no-repeat;background-size:contain}#challenge-success-text{background-image:url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzMiIgaGVpZ2h0PSIzMiIgZmlsbD0ibm9uZSIgdmlld0JveD0iMCAwIDI2IDI2Ij48cGF0aCBmaWxsPSIjMzEzMTMxIiBkPSJNMTMgMGExMyAxMyAwIDEgMCAwIDI2IDEzIDEzIDAgMCAwIDAtMjZtMCAyNGExMSAxMSAwIDEgMSAwLTIyIDExIDExIDAgMCAxIDAgMjIiLz48cGF0aCBmaWxsPSIjMzEzMTMxIiBkPSJtMTAuOTU1IDE2LjA1NS0zLjk1LTQuMTI1LTEuNDQ1IDEuMzg1IDUuMzcgNS42MSA5LjQ5NS05LjYtMS40Mi0xLjQwNXoiLz48L3N2Zz4=);padding-left:42px}.text-center{text-align:center}.big-button{border:.063rem solid #0051c3;border-radius:.313rem;font-size:.875rem;line-height:1.313rem;padding:.375rem 1rem;transition-duration:.2s;transition-property:background-color,border-color,color;transition-timing-function:ease}.big-button:hover{cursor:pointer}.captcha-prompt:not(.hidden){display:flex}@media (width <= 720px){.captcha-prompt:not(.hidden){flex-wrap:wrap;justify-content:center}}.pow-button{background-color:#0051c3;color:#fff;margin:2rem 0}.pow-button:hover{background-color:#003681;border-color:#003681;color:#fff}.footer{font-size:.75rem;line-height:1.125rem;margin:0 auto;max-width:60rem;width:100%}.footer-inner{border-top:1px solid #d9d9d9;padding-bottom:1rem;padding-top:1rem}.clearfix:after{clear:both;content:"";display:table}.clearfix .column{float:left;padding-right:1.5rem;width:50%}.diagnostic-wrapper{margin-bottom:.5rem}.footer .ray-id{text-align:center}.footer .ray-id code{font-family:monaco,courier,monospace}.core-msg,.zone-name-title{overflow-wrap:break-word}@media (width <= 720px){.diagnostic-wrapper{display:flex;flex-wrap:wrap;justify-content:center}.clearfix:after{clear:none;content:none;display:initial;text-align:center}.column{padding-bottom:2rem}.clearfix .column{float:none;padding:0;width:auto;word-break:keep-all}.zone-name-title{margin-bottom:1rem}}.loading-spinner{height:76.391px}.lds-ring{display:inline-block;position:relative}.lds-ring,.lds-ring div{height:1.875rem;width:1.875rem}.lds-ring div{animation:lds-ring 1.2s cubic-bezier(.5,0,.5,1) infinite;border:.3rem solid transparent;border-radius:50%;border-top-color:#313131;box-sizing:border-box;display:block;position:absolute}.lds-ring div:first-child{animation-delay:-.45s}.lds-ring div:nth-child(2){animation-delay:-.3s}.lds-ring div:nth-child(3){animation-delay:-.15s}@keyframes lds-ring{0%{transform:rotate(0)}to{transform:rotate(1turn)}}@media screen and (-ms-high-contrast:active),screen and (-ms-high-contrast:none){.main-wrapper,body{display:block}}.rtl .heading-favicon{margin-left:.5rem;margin-right:0}.rtl #challenge-success-text{background-position:100%;padding-left:0;padding-right:42px}.rtl #challenge-error-text{background-position:100%;padding-left:0;padding-right:34px}</style><meta http-equiv="refresh" content="375"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div id="challenge-error-title"><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "stube.cc",cType: 'managed',cNounce: '84724',cRay: '879aec8cacdd20c3',cHash: '17897ddc7fd5547',cUPMDTk: "\/category\/classroom\/?__cf_chl_tk=Vy4.hTbH7rjCdxvtvInBbvEKNPSJ4G1WRHosNHyib8o-1714012361-0.0.1.1-1535",cFPWv: 'b',cTTimeMs: '1000',cMTimeMs: '375000',cTplV: 5,cTplB: 'cf',cK: "visitor-time",fa: "\/category\/classroom\/?__cf_chl_f_tk=Vy4.hTbH7rjCdxvtvInBbvEKNPSJ4G1WRHosNHyib8o-1714012361-0.0.1.1-1535",md: "UQ4cdftAuqNMalKUy6yuUqqyP3Z3Y3Kn.6TiDE5YWlo-1714012361-1.1.1.1-HVMRqbEsUfxjdrlJjWw3mgNpJmDnlDZUOv_0wo71dKjtVrzeBYaeGNgDg.1c27h4djL7377wC4DWdRhd1E8wBH66Vl0_51kQ1V6iy8DNyES4srmpjlrsKuMMbT6jhvIHjjNTROvDvIeY5cbhB5x4NaE.NLb7_WdBb3UlNIDql7wdalP.vbP8_2kK7ecevHyXXdurVTHpsodweaqpka.2sSsBv9Wc3LUpFtvFvZ4LACZ2Vb01fKzleN0hVVZgHTsrNgcjhNdr6d0FfSyNDNndXUpXfGfeA.pazTotH91y2BomURXcxGQxIikzHfvL1EQ0BCbzgGwHKmOB8THgHgOrIIpd7JT0XS7C7FfUqDJFkSqOOsomCrHn8lGvCZEYGD2xZJGsYEv.JPlJIZyY1LRLvqJ5Syn2W2szdn14ZU7l_1.F8BZWNaCEuMYSSB_S70eXQmWuIM6EXScmol8isEO8XJp1CtEHAcXxGNbCQmagVwurmK2pCnx.PBll262LpyNCMFcLno6S9fNgzddt5E8j7usmvcqR4JseeEVAVkinX4mFqiASuKGBY2eytj1HzvX6qZKLmINLfRbbHUW66Mcr9S0WmEzw2xZGvpZioUBDGUMppx9bGgft0qqj_iuJHJ.vfZEsPy2pBZ1j_L0tTPW3Kwsto1HPS0npbC1mZEShE_KBDLTpUhEwNSl70QsoWkcLtSHS7qNC5JQE33XwY8wTmHvTS4ZIbSOitjxS.yrRs_SLTU87PCXb0mNqnvUITZUaR0kV3VeNpbJbTVbkqMD5.US7gMEh.w_bRA96bxAiDHXJycIwn07H05hzSFVxDgfWWPQ5EmU2wacIi39ekZQvwBKaMJDkMae22xa1FDgKwTLWq47iQJAxACIsKeXTZsJzIxvGHL6yB9lR525L4khwD2.QXn9f_dUn3PCr1wA40IkFgDOjwRtASsWRgg34ZeoJg1an7W.Py9Z8p7ZI3MvUICLWCnO1kpWmPUURWKw5KqHa5v2APLkpw_mWuugqd2KCPIiKzbTmap_QjzKxvfN.EeM6tP4ZQf_29cY3_d.u49ZOU_sbzjxXCCaCvi6pMVCD.p8M7wKa1OHVV46dbd.6mM4AvFTrsmrQUg_OLd76giZ1gUuVzveROE7XmiTFBn4uTF2BcPxntH361rRGOULIZLp.lWNy50vIy3MVxTcUOghvVXNJALLxbozXb0kbiP8y92QnHDO.8mAAJX7kKAXKAHTbOIPDX.RB5vj7g.7iFTN_NOjAZVg.yXWyPfxdvFNpgGF3mmuU5_E8vKcZFAM_RIDK3tupc.ZfE6LwcPELVVzwnQ4qz5EJR1nQxqVs0p_iA6wYsXoKJj8P0kTHG05hOPaFTrJiR.ISqw6K59Jhi5bJn.rllRKIAmjwUJ9_EqEzOWOgUsLI7.K8fRIb5nmUdxg4Ln2Rc16GlUqDjoeKdkYcbFFFNxGWRDrTM7yJgBG4",mdrd: "LXILRBSIOeg3E2p.EfupSulZFdRnVIWUIcjghTdu1kI-1714012361-1.1.1.1-EE.xqwlaG4y1zSO_BDPeCSQ5l14UNj5Z4XEN4tn4UINLuvFBbutvSW0q0c91iM.Ha6BkyswhVBMEqiQ1lTdNQJAQ9nOJPjHHohasuszRiyJclTu7l_mBTHfusBaKKN6wxyoR8_V8eEnVEVX1nSlpVBM2AHrcWS.p7cbv3dCRQPN1PI0LFOYNfLhoelv7UqT71HoITxjl8B9B.w8wtQ7R3K76sS24lARQQKBOsBU5AVlXMulsRqVSVPkTJDfr9fAU4Z.Hv9yJpMY8Gqia0KBs5j0tmn6vlx4Cat33r7ns5Tq.8FVQ9PfaAlg2BHgEptOeKqxifGig0CBYBWv3DZsZHweIEhXc3Qlj0aXvbBgAxvVMr10yminH37Qqg4lNgOt966h8277InzbHmzuS2SUYw8tYiHSur0byOJvWSnJOIoofvvGx_teDVw29NzCGg1_2SGXGx8Z6d2i.EAxOQjYuioJp.3HsSCfKDkjfXSdWNA3UQGcgzTreYsGcY7Bv.i5lEhHr0nNWM.LDBL6ajiuYofv4KI9C26nwJGgXYNzf059eQNsqxf88_9MoTRGclNfB7HRTBdWqHk2mB9hTMZVfqfc7w6ZxI3dPIV650.P6O4jIzBognX5efSoD4aGIiFDgj3yZECxpttY_v724iKMf95QYzXjKNECx6XBgZ_Vd2e0XltePGCVKnFpSXrJ4uHLwEufG0Lpk9h04NcvZ7Yviq9R03QeCUxXpbUTmeJsDy_8sLlm2U.DEMzGp.2bqaVAyYF7SClyPUeFC9NR7JjkR9FVXzQPepYv7WRggCXp8GVL_eE19IoBkL0Bwdz5ABWDNHQMukqRLulUqVLdV1SNS6CpkxgmwHY_UMSGQX3h72GF1aKC2qsMVab56qUsVGhX5MPIDfwoxXH2HrvuyFAIZwCnTnvYiqvAyg5ATXouzBhkXRnjzOoPMx7qVF1UJzDk.yMxyYVwrYqctfPDvMu1wkfPrt6JpsfkgL7MOZfTsTNyY9octyyPmTtgUVtOc.kpqIw30bO1Z.yDSYzsjYptLSrJ1mgdp9gfPc.KxoIq1H5wCbtveVD4V8w.Gd0tKGsRY2DFxtX05RgRROoGg9WoNnFs0d7XVtfiodqro79_XlLhoOhhIUtx5BLHVpKEr53AL9o.zj24AbGfuQcldYl_mZZBXD6wVu9cNH_iKccr3BTzvbD7NLKDa1yl87pCvjWqLiK6Q_rEZcaPyqyD1VqffmCrDj0An55.UKuzSOl8zMkazcOb4uTxT7tkvIr1Ilxx53Odc4.RQs.eeE_ZMyVwALJLlfj9tfG8VkzdXhFWW6Xejd7Gv2XSXmh21bP6ijWIoR4xoCxi6tlzNpDuLUqk2bDm79VQ65V7Ap5NNKB9IWyF0q.BdkxrbY3Zjp42YD.l4A7xI.m4FEi..3664mbh8OnHrDHkS4ctKI_OypL50cmQ07_6bpFR1pFiojwbg6MKBfaXsQ2gwo0awjFqrvVRixKHuV8n0pFnwnRy.GMe8digTWVO1zC3LLK8OkSpTT7Zd1S_zkO8COtmW81qwA4wWu23cgGgmkOVZfNJ8PxsO8RNx6.N.ULcN4lyTQi9xue3oW7DdDaHTCdTr6vZHWcRhASFnKNGe9Z3GnFdc_pTGSdo6cYO8MVZJEUjABFpJaeuT",cRq: {ru: 'aHR0cHM6Ly9zdHViZS5jYy9jYXRlZ29yeS9jbGFzc3Jvb20v',ra: 'RmVlZFZhbGlkYXRvci8xLjM=',rm: 'R0VU',d: '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',t: 'MTcxNDAxMjM2MS43MTEwMDA=',cT: Math.floor(Date.now() / 1000),m: 'YO7XZ0kzkFQXbsYke7F9EoilGemgBzMZLvNc+br3JXI=',i1: '+2i8viU7vpda0QOOE5fzfQ==',i2: '2stDogdChY3dIR94h/5n+Q==',zh: 'PZjOlOx23779UgNziaiKFTds1spRVRgabvAEDwf0y/A=',uh: 'aV9K/tYaR5/iytF1XfLJ1LGhXMj+Bc3gpNZsWPkwN98=',hh: 'ybYcoE5uZfswDYpCNMy+S2drqnPYR/vEA0JZeGuCf5w=',}};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=879aec8cacdd20c3';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, "\/category\/classroom\/?__cf_chl_rt_tk=Vy4.hTbH7rjCdxvtvInBbvEKNPSJ4G1WRHosNHyib8o-1714012361-0.0.1.1-1535" + 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