javascript:(async () => {     const rawUrl =         location.origin +         location.pathname +         location.search;      const canonicalUrl = cleanUrl(         document.querySelector('link[rel="canonical"]')?.href ||         rawUrl     );      const bytes = new TextEncoder().encode(canonicalUrl);     const digest = await crypto.subtle.digest("SHA-256", bytes);      const hash = [...new Uint8Array(digest)]         .map(b => b.toString(16).padStart(2, "0"))         .join("");      const params = new URLSearchParams({         rawUrl,         canonicalUrl     });      const PW_BASE_URL = "https://cx22.localhost/cygnus_x1/labs/KSN-01/";      const url =         `${PW_BASE_URL}api/${hash}.json?${params}`;      const response = await fetch(url);      if (!response.ok) {         if (response.status === 404) return;         throw new Error(`PW: ${response.status}`);     }      const annotations = await response.json();      for (const { selector, href } of annotations) {         const range = resolveTextQuoteSelector(selector);          if (range) {             applyLink(range, href);         }     }     function resolveTextQuoteSelector(selector) {         if (selector?.type !== "TextQuoteSelector" || !selector.exact) {             return null;         }          const nodes = [];         const walker = document.createTreeWalker(             document.body,             NodeFilter.SHOW_TEXT,             {                 acceptNode(node) {                     const parent = node.parentElement;                      if (!parent) return NodeFilter.FILTER_REJECT;                      if (["SCRIPT", "STYLE", "NOSCRIPT", "TEXTAREA"].includes(parent.tagName)) {                         return NodeFilter.FILTER_REJECT;                     }                      return NodeFilter.FILTER_ACCEPT;                 }             }         );          while (walker.nextNode()) {             nodes.push(walker.currentNode);         }          const text = nodes.map(node => node.nodeValue).join("");          const {             exact,             prefix = "",             suffix = ""         } = selector;          let offset = 0;          while ((offset = text.indexOf(exact, offset)) !== -1) {             const before = text.slice(                 Math.max(0, offset - prefix.length),                 offset             );              const after = text.slice(                 offset + exact.length,                 offset + exact.length + suffix.length             );              const prefixMatches = !prefix || before.endsWith(prefix);             const suffixMatches = !suffix || after.startsWith(suffix);              if (prefixMatches && suffixMatches) {                 const start = offset;                 const end = offset + exact.length;                  let position = 0;                 let startNode, startOffset;                 let endNode, endOffset;                  for (const node of nodes) {                     const next = position + node.nodeValue.length;                      if (!startNode && start >= position && start <= next) {                         startNode = node;                         startOffset = start - position;                     }                      if (end >= position && end <= next) {                         endNode = node;                         endOffset = end - position;                         break;                     }                      position = next;                 }                  if (startNode && endNode) {                     const range = document.createRange();                     range.setStart(startNode, startOffset);                     range.setEnd(endNode, endOffset);                     return range;                 }             }              offset++;         }          return null;     }      function applyLink(range, href) {         // Don't create nested links.         if (             range.startContainer.parentElement?.closest("a") ||             range.endContainer.parentElement?.closest("a") ||             range.cloneContents().querySelector?.("a")         ) {             return;         }          const a = document.createElement("a");         a.href = href;         a.target = "_blank";         a.dataset.pw = "link";          a.appendChild(range.extractContents());         range.insertNode(a);     }     function cleanUrl(url) {         const u = new URL(url);          // Fragments are not part of page identity.         u.hash = "";          // Remove common tracking parameters.         for (const key of [...u.searchParams.keys()]) {             if (                 key.startsWith("utm_") ||                 ["fbclid", "gclid", "dclid", "msclkid"].includes(key)             ) {                 u.searchParams.delete(key);             }         }          // Deterministic ordering.         u.searchParams.sort();          return u.toString();     } })();