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/** |
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* Delay bootstrap: the inline script Delay JS prints once, on wp_footer. |
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* |
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* It waits for the visitor's first interaction (or the failsafe timeout), |
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* then runs the replay: every delayed script is put back, in page order, |
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* and each one hears DOMContentLoaded, readystatechange and load once, as |
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* if it had run while the page loaded (#494). |
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* |
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* This is the readable source. `npm run build` minifies it into |
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* assets/delay-bootstrap.min.js with scripts/minify-delay-bootstrap.mjs, |
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* which only minifies: it adds no wrapper, helper or strict-mode line. |
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* Minify_Filters::print_delay_bootstrap() inlines the built copy and puts |
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* the timeout in place of XSPEED_DELAY_TIMEOUT at the very end. Edit this |
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* file, rebuild, and commit both; a unit test fails when the built copy is |
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* stale. Behaviour is pinned in a real browser by |
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* tests/e2e/85-delay-js-replay-harness.spec.ts, and the choice to rename |
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* listeners rather than fire the real events again is ADR 0001. |
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* |
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* Why the replay renames listeners. It runs after the page has loaded, so |
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* DOMContentLoaded and load have already fired, and a delayed script that |
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* sets itself up in one of those listeners is never called. Dispatching the |
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* real events again would run every eager script's handlers a second time. |
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* Instead, while the replay runs, addEventListener/removeEventListener on |
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* document and window file the three lifecycle events under private xs-* |
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* names. Only code running during the replay registers there, so |
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* dispatching the private names reaches exactly the replayed scripts. The |
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* dispatched event reports the real `type`: shared handlers and jQuery's |
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* dispatcher look handlers up by it. |
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* |
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* Properties this sets on script elements (plain properties, so the |
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* minifier leaves their names alone): |
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* - _xs: one of our clones of a delayed script; |
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* - _xe: on the page, and not delayed, when the replay started; |
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* - _xf: written into the page by our document.write redirect; |
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* - _xw: where the next write from that script goes. |
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*/ |
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(function (timeout) { |
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var TRIGGERS = ['mousemove', 'keydown', 'touchstart', 'scroll', 'wheel']; |
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var PRIVATE = { |
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DOMContentLoaded: 'xs-DOMContentLoaded', |
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load: 'xs-load', |
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readystatechange: 'xs-readystatechange', |
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}; |
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|
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// The real readyState, read past any getter defined on document itself |
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// (ours during the replay, or one the page defined). |
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var nativeReadyState = Object.getOwnPropertyDescriptor(Document.prototype, 'readyState'); |
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function realReadyState() { |
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return nativeReadyState ? nativeReadyState.get.call(document) : document.readyState; |
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} |
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|
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// readyState cannot say whether DOMContentLoaded has fired: it turns |
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// 'interactive' BEFORE the defer scripts and modules run. This runs |
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// inline in the footer, before DOMContentLoaded, so a listener records |
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// the real event; Navigation Timing covers a bootstrap that ran later. |
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// The same for load. |
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var started = false; |
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var dclFired = realReadyState() === 'complete'; |
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var loadFired = dclFired; |
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var onRealDcl; |
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document.addEventListener('DOMContentLoaded', function () { |
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dclFired = true; |
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if (onRealDcl) onRealDcl(); |
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}); |
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window.addEventListener('load', function () { |
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loadFired = true; |
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}); |
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|
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// Dispatch the private copy of a lifecycle event under its real type. |
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// The dispatched load reports document as its target, as the real one |
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// does. |
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function firePrivate(target, type, bubbles) { |
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var event = new Event(PRIVATE[type], { bubbles: !!bubbles }); |
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Object.defineProperty(event, 'type', { value: type }); |
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if (type === 'load') Object.defineProperty(event, 'target', { value: document }); |
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target.dispatchEvent(event); |
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} |
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|
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function callHandler(handler, target, type) { |
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if (typeof handler !== 'function') return; |
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try { |
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handler.call(target, new Event(type)); |
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} catch (e) {} |
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} |
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|
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function typeOf(script) { |
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return (script.getAttribute('type') || '').trim().toLowerCase(); |
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} |
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|
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// Whether the browser will execute a script of this type. One it will |
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// not run (text/plain, nomodule, text/babel) fires neither load nor |
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// error, so counting it would hold the replay open. |
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function willRun(script, type) { |
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return !script.noModule && /^$|^module$|^(text|application)\/(x-)?(java|ecma|j|live)script$/.test(type); |
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} |
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|
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function start() { |
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if (started) return; |
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started = true; |
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TRIGGERS.forEach(function (name) { |
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window.removeEventListener(name, start, { passive: true, capture: true }); |
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}); |
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var nav = window.performance && performance.getEntriesByType && performance.getEntriesByType('navigation')[0]; |
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if (nav && nav.domContentLoadedEventStart > 0) dclFired = true; |
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|
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// pageLoaded: the replay starts after load, the usual case ("late"). |
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// phase: 0 until the synthetic DOMContentLoaded, then 1 until load. |
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// pending: what the current phase still waits for; it starts at 1 for |
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// the loop below. heldInlines: inline scripts still waiting behind an |
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// external. modules: inline module index -> 1 inserted, 2 running |
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// between its markers, 0 done. |
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var pageLoaded = loadFired; |
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var live = 1; |
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var wrapped = []; |
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var pending = 1; |
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var deadline; |
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var phase = 0; |
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var heldInlines = 0; |
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var modules = {}; |
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|
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// When the replay starts before the real DOMContentLoaded, wait for it |
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// before sending our own copy, so a script that registered after it |
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// still gets one. |
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if (!dclFired) { |
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pending++; |
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onRealDcl = function () { |
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onRealDcl = 0; |
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Promise.resolve().then(function () { |
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if (!phase) done(); |
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}); |
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}; |
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} |
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|
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// A readystatechange 'complete' still to come is forwarded to the |
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// private name when it happens. This is registered before our wrappers, |
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// so it goes on the real name. A handler a delayed script set on |
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// document.onreadystatechange before the real 'interactive' hears it |
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// from the browser, so the synthetic one skips it. |
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if (!pageLoaded) { |
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document.addEventListener('readystatechange', function () { |
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if (realReadyState() === 'interactive') currentRsc = document.onreadystatechange; |
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if (realReadyState() === 'complete') firePrivate(document, 'readystatechange'); |
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}); |
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} |
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|
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// Scripts already on the page keep the real event names and the native |
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// document.write for their own top-level code: a page defer script's |
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// readystatechange listener hears only the real one, and the browser |
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// ignores their writes after parsing as it always did. |
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Array.prototype.forEach.call(document.scripts, function (script) { |
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if (!script.hasAttribute('data-xs-delay')) script._xe = 1; |
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}); |
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|
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// The wrappers. What is renamed is decided on each call, by which events |
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// have really fired: DOMContentLoaded once it has, readystatechange once |
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// parsing has finished, window load once the page has loaded. A listener |
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// for an event still to come stays on the real name and hears the real |
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// event, whoever adds it; one for an event already gone gets a private |
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// copy. Renaming everything from the start was worse: eager scripts |
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// still registering had their listeners renamed, jQuery's completed() |
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// ran twice, and the Interactivity API's hydration was held until the |
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// replay ended. |
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// |
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// load is renamed on window only. The page's load never reaches a |
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// listener on document, so one there catches its descendants' loads |
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// in the capture phase (image delegation); renaming it would cut the |
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// delayed script off from every image after this. |
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// |
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// What renaming cannot tell apart: eager code in a timer or handler (no |
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// currentScript) registering during the replay gets one synthetic event |
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// where it would have got none. |
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// |
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// The wrappers look the prototype method up on every call: Sentry or |
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// zone.js, delayed too, can patch EventTarget.prototype during the |
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// replay, and listeners added after that must go through their patch. |
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// A removal takes the listener off both the real and the private name, |
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// so one added before an event fired and removed after (jQuery's |
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// completed()) is still found. |
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[document, window].forEach(function (target) { |
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var proto = Object.getPrototypeOf(target); |
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var ownAdd = target.addEventListener; |
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var ownRemove = target.removeEventListener; |
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var hadOwn = Object.prototype.hasOwnProperty.call(target, 'addEventListener'); |
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var nameFor = function (type) { |
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var current = document.currentScript; |
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var gone = |
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type === 'load' |
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? target === window && loadFired |
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: type === 'DOMContentLoaded' |
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? dclFired |
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: realReadyState() !== 'loading'; |
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return live && !(current && current._xe) && PRIVATE.hasOwnProperty(type) && gone ? PRIVATE[type] : type; |
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}; |
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var add = function (type, listener, options) { |
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return (hadOwn ? ownAdd : proto.addEventListener).call(this, nameFor(type), listener, options); |
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}; |
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target.addEventListener = add; |
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target.removeEventListener = function (type, listener, options) { |
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var remove = hadOwn ? ownRemove : proto.removeEventListener; |
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if (PRIVATE.hasOwnProperty(type)) remove.call(this, PRIVATE[type], listener, options); |
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return remove.call(this, type, listener, options); |
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}; |
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wrapped.push([target, ownAdd, ownRemove, hadOwn, add]); |
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}); |
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|
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// window.onload / document.onreadystatechange set during the replay are |
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// keyed on the real names, so they are called directly. A page handler |
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// already there is swapped for an empty one first: the old addLoadEvent |
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// chain (`var o=window.onload; window.onload=function(){o();mine();}`) |
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// would otherwise run it a second time. It has run, and the browser |
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// will not call it again. If nothing replaced the empty one, the page's |
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// handler is put back at the end, so code that calls window.onload() |
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// later (a PJAX re-init) still finds it. |
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var pageOnload = window.onload; |
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var pageRsc = document.onreadystatechange; |
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var currentOnload = pageOnload; |
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var currentRsc = pageRsc; |
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var jq = window.jQuery; |
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var ended; |
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if (pageLoaded && pageOnload) currentOnload = window.onload = function () {}; |
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if (pageLoaded && pageRsc) currentRsc = document.onreadystatechange = function () {}; |
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|
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// The replayed scripts read a fake document.readyState: 'loading' while |
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// they run, then 'interactive' for the synthetic DOMContentLoaded, then |
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// the real value once the replay ends. Left at the real value, a script |
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// that starts at once when the page is past 'loading' and also adds an |
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// unguarded DOMContentLoaded listener started twice, and a |
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// readystatechange handler waiting for 'interactive' never ran. |
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// |
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// The fake is scoped: the getter answers with it only while one of our |
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// clones runs (currentScript carries _xs), while an inline module runs |
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// between its markers (modules have no currentScript), and while our own |
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// dispatch runs (fakeDepth). Everything else reads the real value: eager |
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// code, timers, callbacks, and scripts the page or the replayed ones |
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// inject. So a delayed script that listens at top level and re-checks |
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// for 'complete' in a timer starts twice. |
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// |
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// The define is configurable and in a try: WP Rocket's first fake threw |
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// where Cloudflare Rocket Loader had locked the property (#5709), and a |
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// locked readyState keeps the old behaviour here. A getter the page |
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// defined itself (another optimizer, a polyfill) is read through and |
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// put back, not deleted. |
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var writtenPending = 0; |
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var fakeState = 'loading'; |
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var fakeDepth = 0; |
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var ownReadyState = Object.getOwnPropertyDescriptor(document, 'readyState'); |
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var faking = |
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nativeReadyState && |
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(function () { |
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try { |
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Object.defineProperty(document, 'readyState', { |
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configurable: true, |
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get: function () { |
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var current = document.currentScript; |
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if ((current && current._xs) || fakeDepth) return fakeState; |
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return ownReadyState && ownReadyState.get ? ownReadyState.get.call(document) : realReadyState(); |
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}, |
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}); |
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return 1; |
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} catch (e) {} |
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})(); |
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|
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// With readyState faked, a script may write into the page as if it were |
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// still being parsed. From an inline script that would wipe the |
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// document, so for the length of the replay document.write/writeln put |
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// the markup in after the script that wrote it, in call order. A script |
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// the parser is still running writes into the parser as always: while |
| 268 |
// the real readyState is 'loading', a caller that is not one of our |
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// clones gets the native write. With no currentScript (a timer, a |
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// callback) there is nowhere to put it, and the write is dropped rather |
| 271 |
// than wiping the page. |
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// |
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// A written <script src> runs whenever it arrives: fragment scripts are |
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// async. One written that way (an ad tag's second stage) writes through |
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// the redirect too, even while the page still parses, and the redirect |
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// stays until every written <script src> has loaded or failed, however |
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// long after the replay that is. Each of write and writeln is put back |
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// only if it is still ours: an ad loader may have installed its own. |
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var nativeWrite = [ |
| 280 |
document.write, |
| 281 |
document.writeln, |
| 282 |
Object.prototype.hasOwnProperty.call(document, 'write'), |
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]; |
| 284 |
function redirectWrite(args, end) { |
| 285 |
var current = document.currentScript; |
| 286 |
var html = Array.prototype.join.call(args, '') + end; |
| 287 |
if (!current) return; |
| 288 |
if (current._xe || (!current._xs && !current._xf && realReadyState() === 'loading')) { |
| 289 |
return (end ? nativeWrite[1] : nativeWrite[0]).apply(document, args); |
| 290 |
} |
| 291 |
if (!current.parentNode) return; |
| 292 |
if (!('_xw' in current)) current._xw = current.nextSibling; |
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try { |
| 294 |
var fragment = document.createRange().createContextualFragment(html); |
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Array.prototype.forEach.call(fragment.querySelectorAll('script'), function (script) { |
| 296 |
script._xf = 1; |
| 297 |
if (!script.src) return; |
| 298 |
writtenPending++; |
| 299 |
var settled = 0; |
| 300 |
var settle = function () { |
| 301 |
if (settled) return; |
| 302 |
settled = 1; |
| 303 |
writtenPending--; |
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if (ended && !heldInlines && !writtenPending) restoreWrite(); |
| 305 |
}; |
| 306 |
script.addEventListener('load', settle); |
| 307 |
script.addEventListener('error', settle); |
| 308 |
}); |
| 309 |
current.parentNode.insertBefore(fragment, current._xw); |
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} catch (e) {} |
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} |
| 312 |
var ourWrite = (document.write = function () { |
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redirectWrite(arguments, ''); |
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}); |
| 315 |
var ourWriteln = (document.writeln = function () { |
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redirectWrite(arguments, '\n'); |
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}); |
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function restoreWrite() { |
| 319 |
if (document.write === ourWrite) { |
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if (nativeWrite[2]) document.write = nativeWrite[0]; |
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else delete document.write; |
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} |
| 323 |
if (document.writeln === ourWriteln) { |
| 324 |
if (nativeWrite[2]) document.writeln = nativeWrite[1]; |
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else delete document.writeln; |
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} |
| 327 |
} |
| 328 |
|
| 329 |
function fireReadyStateChange() { |
| 330 |
firePrivate(document, 'readystatechange'); |
| 331 |
if (document.onreadystatechange !== currentRsc) { |
| 332 |
callHandler(document.onreadystatechange, document, 'readystatechange'); |
| 333 |
} |
| 334 |
} |
| 335 |
|
| 336 |
// jQuery keeps ONE native listener per element and type. If window load |
| 337 |
// already had jQuery handlers before the replay, that listener is on the |
| 338 |
// real name and the private dispatch cannot reach handlers appended to |
| 339 |
// the list, so those, and only those, are called directly in finish(). |
| 340 |
function jqueryLoadHandlers() { |
| 341 |
var events = jq && jq._data && jq._data(window, 'events'); |
| 342 |
return (events && events.load) || []; |
| 343 |
} |
| 344 |
var jqueryLoadCount = jqueryLoadHandlers().length; |
| 345 |
|
| 346 |
// Called once per thing the current phase waits for. Order matches a |
| 347 |
// real page: readystatechange ('interactive'), DOMContentLoaded |
| 348 |
// (bubbles document -> window, so it is not also dispatched on window), |
| 349 |
// readystatechange ('complete'), load. |
| 350 |
// |
| 351 |
// Between DOMContentLoaded and load there is a second wait. On a real |
| 352 |
// page a script inserted before load delays it, so a script that a |
| 353 |
// DOMContentLoaded handler or jQuery ready code injects (GTM's DOM Ready |
| 354 |
// trigger) always hears load. So the observer stays on, and load waits |
| 355 |
// for what it sees. A wait left over from the first phase (the deadline |
| 356 |
// cut it short) is ignored when it ends, and so are module markers. |
| 357 |
// |
| 358 |
// load also waits for jQuery's ready callbacks. On a real page ready |
| 359 |
// runs before load, so `jQuery(function(){ $(window).on('load', f) })`, |
| 360 |
// the common WordPress pattern, gets f. jQuery 3 runs ready callbacks on |
| 361 |
// timers, so a callback queued after the delayed scripts' own, then one |
| 362 |
// more timer, is when they have all run. 1s caps it (jQuery.holdReady |
| 363 |
// can hold ready indefinitely); the callback and the cap share one slot. |
| 364 |
function done() { |
| 365 |
if (pending < 1 || --pending) return; |
| 366 |
if (phase) return finish(); |
| 367 |
phase = 1; |
| 368 |
clearTimeout(deadline); |
| 369 |
for (var i in modules) if (modules[i] === 2) fakeDepth--; |
| 370 |
modules = {}; |
| 371 |
if (faking) { |
| 372 |
fakeState = 'interactive'; |
| 373 |
fakeDepth++; |
| 374 |
fireReadyStateChange(); |
| 375 |
} |
| 376 |
firePrivate(document, 'DOMContentLoaded', 1); |
| 377 |
if (faking) fakeDepth--; |
| 378 |
if (pageLoaded && !faking) fireReadyStateChange(); |
| 379 |
pending = 1; |
| 380 |
var $ = window.jQuery; |
| 381 |
var once = 0; |
| 382 |
var ready = function () { |
| 383 |
if (!once) { |
| 384 |
once = 1; |
| 385 |
done(); |
| 386 |
} |
| 387 |
}; |
| 388 |
try { |
| 389 |
if ($ && $.fn && $.fn.ready) { |
| 390 |
$(function () { |
| 391 |
setTimeout(ready, 0); |
| 392 |
}); |
| 393 |
setTimeout(ready, 1000); |
| 394 |
return; |
| 395 |
} |
| 396 |
} catch (e) {} |
| 397 |
setTimeout(ready, 0); |
| 398 |
} |
| 399 |
|
| 400 |
// Restore puts back what was there (delete our own-property shadow, or |
| 401 |
// reassign a shadow someone set before us) unless another wrapper has |
| 402 |
// since been put on top; `live` makes ours inert either way. |
| 403 |
function finish() { |
| 404 |
if (ended) return; |
| 405 |
ended = 1; |
| 406 |
if (observer) observer.disconnect(); |
| 407 |
if (faking) { |
| 408 |
if (ownReadyState) Object.defineProperty(document, 'readyState', ownReadyState); |
| 409 |
else delete document.readyState; |
| 410 |
if (pageLoaded) fireReadyStateChange(); |
| 411 |
} |
| 412 |
if (!heldInlines && !writtenPending) restoreWrite(); |
| 413 |
live = false; |
| 414 |
wrapped.forEach(function (entry) { |
| 415 |
var target = entry[0]; |
| 416 |
if (target.addEventListener !== entry[4]) return; |
| 417 |
if (entry[3]) { |
| 418 |
target.addEventListener = entry[1]; |
| 419 |
target.removeEventListener = entry[2]; |
| 420 |
} else { |
| 421 |
delete target.addEventListener; |
| 422 |
delete target.removeEventListener; |
| 423 |
} |
| 424 |
}); |
| 425 |
if (loadFired) firePrivate(window, 'load'); |
| 426 |
if (pageLoaded) { |
| 427 |
if (window.onload !== currentOnload) callHandler(window.onload, window, 'load'); |
| 428 |
if (jqueryLoadCount) { |
| 429 |
jqueryLoadHandlers() |
| 430 |
.slice(jqueryLoadCount) |
| 431 |
.forEach(function (handleObj) { |
| 432 |
try { |
| 433 |
var event = jq.Event('load'); |
| 434 |
event.currentTarget = window; |
| 435 |
event.handleObj = handleObj; |
| 436 |
event.data = handleObj.data; |
| 437 |
handleObj.handler.call(window, event); |
| 438 |
} catch (e) {} |
| 439 |
}); |
| 440 |
} |
| 441 |
} |
| 442 |
if (pageOnload && window.onload === currentOnload) window.onload = pageOnload; |
| 443 |
if (pageLoaded && pageRsc && document.onreadystatechange === currentRsc) document.onreadystatechange = pageRsc; |
| 444 |
// Marks the end, for tests and integrators. |
| 445 |
document.dispatchEvent(new Event('xspeed:replayed')); |
| 446 |
} |
| 447 |
|
| 448 |
// Wait for a script's load or error: listeners, never n.onload, which |
| 449 |
// would replace an author's copied onload attribute. They go on before |
| 450 |
// insertion, which is what starts the fetch. |
| 451 |
function wait(script, cap) { |
| 452 |
pending++; |
| 453 |
var settled = 0; |
| 454 |
var timer; |
| 455 |
var inPhase = phase; |
| 456 |
function one() { |
| 457 |
if (settled) return; |
| 458 |
settled = 1; |
| 459 |
clearTimeout(timer); |
| 460 |
if (!cap && !phase) armDeadline(); |
| 461 |
if (inPhase === phase) done(); |
| 462 |
} |
| 463 |
script.addEventListener('load', one); |
| 464 |
script.addEventListener('error', one); |
| 465 |
if (cap) timer = setTimeout(one, cap); |
| 466 |
} |
| 467 |
|
| 468 |
// A script a replayed script injects (a tag manager's payload, a widget's |
| 469 |
// real code) is waited for too, 1s each: the cap WP Rocket and WP Meteor |
| 470 |
// use, because some never fire load or error (one added through |
| 471 |
// innerHTML never runs). A script injected later than that gets no |
| 472 |
// events. Our own clones carry _xs, so they are not counted twice. |
| 473 |
function seen(script) { |
| 474 |
if (!script._xs && script.hasAttribute('src') && willRun(script, typeOf(script))) wait(script, 1000); |
| 475 |
} |
| 476 |
var observer = |
| 477 |
window.MutationObserver && |
| 478 |
new MutationObserver(function (records) { |
| 479 |
records.forEach(function (record) { |
| 480 |
Array.prototype.forEach.call(record.addedNodes, function (node) { |
| 481 |
if (node.nodeName === 'SCRIPT') seen(node); |
| 482 |
else if (node.querySelectorAll) Array.prototype.forEach.call(node.querySelectorAll('script'), seen); |
| 483 |
}); |
| 484 |
}); |
| 485 |
}); |
| 486 |
if (observer) observer.observe(document.documentElement, { childList: true, subtree: true }); |
| 487 |
|
| 488 |
// A server that never answers does not hold DOMContentLoaded past 15s |
| 489 |
// with no progress. Each replayed external that loads or fails in the |
| 490 |
// first phase restarts the 15s, so the whole wait is at most 15s per |
| 491 |
// external. A fixed 15s from the first interaction sent the events while |
| 492 |
// a slow connection was still bringing in jQuery and the builder scripts, |
| 493 |
// and those then missed them for good. An injected script has its own 1s |
| 494 |
// cap and restarts nothing: the observer also sees the page's own |
| 495 |
// scripts, and a page that keeps adding them (an ad refresh, a carousel |
| 496 |
// cloning a slide with a script in it) would hold the events forever. |
| 497 |
function armDeadline() { |
| 498 |
clearTimeout(deadline); |
| 499 |
deadline = setTimeout(function () { |
| 500 |
pending = 1; |
| 501 |
done(); |
| 502 |
}, 15000); |
| 503 |
} |
| 504 |
armDeadline(); |
| 505 |
|
| 506 |
// An inline module evaluates asynchronously but fires no load (the spec |
| 507 |
// fires it only for scripts from a URL), so its replayed text starts and |
| 508 |
// ends with a line that dispatches xs-mod with its index, and the end is |
| 509 |
// counted in pending. Its imports are hoisted, so the end runs once the |
| 510 |
// module and its whole import graph have run. An import that fails to |
| 511 |
// load fires error on the element, which also counts. |
| 512 |
// |
| 513 |
// A module that throws never reaches its end line, but its start line |
| 514 |
// ran and the throw is reported to window: an error while a module is |
| 515 |
// between its markers releases that module only. The release runs one |
| 516 |
// microtask after the error: an error thrown by another listener while |
| 517 |
// the module is still running is reported synchronously, and by the |
| 518 |
// microtask that module has reached its end line. A module paused at a |
| 519 |
// top-level await is between its markers too, so an unrelated error |
| 520 |
// during the pause releases it early; a precise rule costs more than it |
| 521 |
// saves. A dependency that throws stops the module before its start |
| 522 |
// line; the deadline covers that. A module's end is counted a microtask |
| 523 |
// later, so a script it injects is seen first. |
| 524 |
function moduleDone(index) { |
| 525 |
if (modules[index]) { |
| 526 |
if (modules[index] === 2) fakeDepth--; |
| 527 |
modules[index] = 0; |
| 528 |
Promise.resolve().then(done); |
| 529 |
} |
| 530 |
} |
| 531 |
document.addEventListener('xs-mod', function (event) { |
| 532 |
var detail = event.detail; |
| 533 |
if (detail > 0) moduleDone(detail); |
| 534 |
else if (modules[-detail] === 1) { |
| 535 |
modules[-detail] = 2; |
| 536 |
fakeDepth++; |
| 537 |
} |
| 538 |
}); |
| 539 |
window.addEventListener('error', function () { |
| 540 |
Promise.resolve().then(function () { |
| 541 |
for (var i in modules) if (modules[i] === 2) moduleDone(i); |
| 542 |
}); |
| 543 |
}); |
| 544 |
|
| 545 |
// Build the executable copy of a parked tag. index is its 1-based place |
| 546 |
// in the loop, or 0 for a copy nothing waits for. |
| 547 |
function clone(parked, index) { |
| 548 |
var script = document.createElement('script'); |
| 549 |
script._xs = 1; |
| 550 |
// A dynamically-created script is async by default, so replayed |
| 551 |
// externals would race each other; async=false restores document |
| 552 |
// order among them. |
| 553 |
script.async = false; |
| 554 |
// Nonce hiding: a connected element's nonce content attribute reads as |
| 555 |
// "", so copying it through the attribute loop would hand the clone an |
| 556 |
// empty nonce and a nonce CSP would block it. The IDL property still |
| 557 |
// carries the real value. |
| 558 |
if (parked.nonce) script.nonce = parked.nonce; |
| 559 |
Array.prototype.slice.call(parked.attributes).forEach(function (attr) { |
| 560 |
if (attr.name === 'data-xs-src') { |
| 561 |
script.setAttribute('src', attr.value); |
| 562 |
return; |
| 563 |
} |
| 564 |
if (attr.name === 'data-xs-delay') return; |
| 565 |
if (attr.name === 'nonce') return; |
| 566 |
// A parked inline tag's original type (module, mostly) rides in |
| 567 |
// data-xs-type: restore it, or a module runs as a classic script and |
| 568 |
// its imports throw (#274). |
| 569 |
if (attr.name === 'data-xs-type') { |
| 570 |
script.setAttribute('type', attr.value); |
| 571 |
return; |
| 572 |
} |
| 573 |
// type is what a script IS, so it is carried over, except our own |
| 574 |
// parking marker, which exists only to stop the browser running the |
| 575 |
// original. Dropping type wholesale made type="module" a classic |
| 576 |
// script and made a consent manager's type="text/plain" executable |
| 577 |
// again, which is a privacy failure (#274). |
| 578 |
if (attr.name === 'type' && attr.value === 'text/xspeed-delayed') return; |
| 579 |
script.setAttribute(attr.name, attr.value); |
| 580 |
}); |
| 581 |
if (!parked.hasAttribute('data-xs-src')) script.text = parked.text; |
| 582 |
var type = typeOf(script); |
| 583 |
if (index && willRun(script, type)) { |
| 584 |
if (script.hasAttribute('src')) wait(script); |
| 585 |
else if (type === 'module') { |
| 586 |
pending++; |
| 587 |
modules[index] = 1; |
| 588 |
script.text = |
| 589 |
"document.dispatchEvent(new CustomEvent('xs-mod',{detail:-" + |
| 590 |
index + |
| 591 |
'}));' + |
| 592 |
script.text + |
| 593 |
"\n;document.dispatchEvent(new CustomEvent('xs-mod',{detail:" + |
| 594 |
index + |
| 595 |
'}))'; |
| 596 |
script.addEventListener('error', function () { |
| 597 |
moduleDone(index); |
| 598 |
}); |
| 599 |
// A CSP that lists inline scripts by hash blocks the changed text, |
| 600 |
// so on an enforced violation the untouched original goes in |
| 601 |
// instead, unwaited for. Report-only violations are ignored: that |
| 602 |
// copy ran. |
| 603 |
script.addEventListener('securitypolicyviolation', function (event) { |
| 604 |
if (event.disposition === 'enforce' && event.blockedURI === 'inline' && script.parentNode) { |
| 605 |
script.parentNode.replaceChild(clone(parked), script); |
| 606 |
moduleDone(index); |
| 607 |
} |
| 608 |
}); |
| 609 |
} |
| 610 |
} |
| 611 |
return script; |
| 612 |
} |
| 613 |
|
| 614 |
// The loop. An inline script runs the moment it is inserted, so one |
| 615 |
// after a delayed external would run before that external arrived |
| 616 |
// (`jQuery(function(){...})` after a delayed jQuery threw). An inline |
| 617 |
// that follows a classic, non-async, non-defer executable external is |
| 618 |
// inserted from that external's load/error listener instead. The |
| 619 |
// async=false externals run from one ordered list, and the spec fires |
| 620 |
// each one's load right after it runs and before the next starts, so the |
| 621 |
// inline runs exactly between them; the externals are still all inserted |
| 622 |
// at once, so they download in parallel. An async or defer external and |
| 623 |
// a module hold nothing: on a real page none of them blocks the inline |
| 624 |
// after it. |
| 625 |
// |
| 626 |
// A held inline's text is unchanged, so a hash CSP still allows it. Its |
| 627 |
// hold is released a microtask after it goes in, so a script it injects |
| 628 |
// is counted first. A hold released after the deadline no longer counts |
| 629 |
// toward any wait, but the write redirect stays until the last one has |
| 630 |
// gone in. Each tag is cloned and inserted inside its own try, so one |
| 631 |
// the browser refuses costs that script only. |
| 632 |
// |
| 633 |
// A parked tag an earlier replayed script took out of the document is |
| 634 |
// skipped: with no parent, replaceChild throws, and inside a detached |
| 635 |
// subtree the clone never loads. contains(), not isConnected, which |
| 636 |
// older engines lack. |
| 637 |
var lastBlocking; |
| 638 |
document.querySelectorAll('script[data-xs-delay]').forEach(function (parked, k) { |
| 639 |
if (!document.documentElement.contains(parked)) return; |
| 640 |
if (lastBlocking && !parked.hasAttribute('data-xs-src')) { |
| 641 |
pending++; |
| 642 |
heldInlines++; |
| 643 |
var released = 0; |
| 644 |
var inPhase = phase; |
| 645 |
var release = function () { |
| 646 |
if (released) return; |
| 647 |
released = 1; |
| 648 |
heldInlines--; |
| 649 |
try { |
| 650 |
if (document.documentElement.contains(parked)) { |
| 651 |
parked.parentNode.replaceChild(clone(parked, inPhase === phase ? k + 1 : 0), parked); |
| 652 |
} |
| 653 |
} catch (e) {} |
| 654 |
if (ended && !heldInlines && !writtenPending) restoreWrite(); |
| 655 |
if (inPhase === phase) Promise.resolve().then(done); |
| 656 |
}; |
| 657 |
lastBlocking.addEventListener('load', release); |
| 658 |
lastBlocking.addEventListener('error', release); |
| 659 |
return; |
| 660 |
} |
| 661 |
try { |
| 662 |
var script = clone(parked, k + 1); |
| 663 |
parked.parentNode.replaceChild(script, parked); |
| 664 |
} catch (e) { |
| 665 |
return; |
| 666 |
} |
| 667 |
var type = typeOf(script); |
| 668 |
if ( |
| 669 |
script.hasAttribute('src') && |
| 670 |
type !== 'module' && |
| 671 |
!script.async && |
| 672 |
!script.hasAttribute('defer') && |
| 673 |
willRun(script, type) |
| 674 |
) { |
| 675 |
lastBlocking = script; |
| 676 |
} |
| 677 |
}); |
| 678 |
// An inline loader (GTM, gtag, the Meta pixel) injects during the loop, |
| 679 |
// and the observer's records for it arrive in the microtask queued |
| 680 |
// before this one. |
| 681 |
Promise.resolve().then(done); |
| 682 |
} |
| 683 |
|
| 684 |
TRIGGERS.forEach(function (name) { |
| 685 |
window.addEventListener(name, start, { passive: true, capture: true }); |
| 686 |
}); |
| 687 |
// The failsafe timer, for visitors who never interact. 0 means |
| 688 |
// interaction only. |
| 689 |
if (timeout > 0) setTimeout(start, timeout); |
| 690 |
})(XSPEED_DELAY_TIMEOUT); |
| 691 |
|
