has been fully parsed (something follows it), // or once the whole document has been parsed. function pageHasAppeared() { var main = document.getElementById('main-content'); return document.readyState !== 'loading' || !!(main && main.nextElementSibling); } function show() { styleEl = document.createElement('style'); styleEl.textContent = style; document.head.appendChild(styleEl); var wrapper = document.createElement('div'); wrapper.innerHTML = loaderHTML; loader = wrapper.firstChild; document.documentElement.appendChild(loader); } function hide() { if (done) return; done = true; var el = loader; var css = styleEl; var cleanup = function () { if (el && el.parentNode) el.parentNode.removeChild(el); if (css && css.parentNode) css.parentNode.removeChild(css); }; // Before the logo has faded in the cover is plain white: drop it at once, no fade. if (Date.now() - startedAt < SHOW_DELAY_MS) return cleanup(); el.classList.add('fade-out'); setTimeout(cleanup, FADE_MS); } // Cover the page from the very first paint (no header-then-loader flash). show(); // requestAnimationFrame runs right before each paint, so the cover is removed in the // same frame the page content becomes available. (function check() { if (done) return; if (pageHasAppeared() || Date.now() - startedAt >= MAX_VISIBLE_MS) return hide(); requestAnimationFrame(check); })(); // Backup for the cap: requestAnimationFrame is paused in background tabs. setTimeout(hide, MAX_VISIBLE_MS); document.addEventListener('DOMContentLoaded', hide, { once: true }); // Back/forward cache restores skip DOMContentLoaded. window.addEventListener('pageshow', hide, { once: true }); })();

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