diff --git a/cps/static/js/libs/epub-cfi-resolver.js b/cps/static/js/libs/epub-cfi-resolver.js
new file mode 100644
index 00000000..20f4da9c
--- /dev/null
+++ b/cps/static/js/libs/epub-cfi-resolver.js
@@ -0,0 +1,1062 @@
+'use strict';
+// https://github.com/fread-ink/epub-cfi-resolver
+// If using node.js
+if(typeof Node === 'undefined') {
+  var ELEMENT_NODE = 1;
+  var TEXT_NODE = 3;
+  var CDATA_SECTION_NODE = 4;
+} else { // In the browser
+  var ELEMENT_NODE = Node.ELEMENT_NODE;
+  var TEXT_NODE = Node.TEXT_NODE;
+  var CDATA_SECTION_NODE = Node.CDATA_SECTION_NODE;
+}
+
+function cfiEscape(str) {
+  return str.replace(/[\[\]\^,();]/g, "^$&");
+}
+
+// Get indices of all matches of regExp in str
+// if `add` is non-null, add it to the matched indices
+function matchAll(str, regExp, add) {
+  add = add || 0;
+  var matches = [];
+  var offset = 0;
+  var m;
+  do {
+    m = str.match(regExp);
+    if(!m) break
+    matches.push(m.index + add);
+    offset += m.index + m.length;
+    str = str.slice(m.index + m.length);
+  } while(offset < str.length);
+
+  return matches;
+}
+
+// Get the number in a that has the smallest diff to n
+function closest(a, n) {
+  var minDiff;
+  var closest;
+  var i, diff;
+  for(i=0; i < a.length; i++) {
+    diff = Math.abs(a[i] - n);
+    if(!i || diff < minDiff) {
+      diff = minDiff;
+      closest = a[i];
+    }
+  }
+  return closest;
+}
+
+// Given a set of nodes that are all children
+// and a reference to one of those nodes
+// calculate the count/index of the node
+// according to the CFI spec.
+// Also re-calculate offset if supplied and relevant
+function calcSiblingCount(nodes, n, offset) {
+  var count = 0;
+  var lastWasElement;
+  var prevOffset = 0;
+  var firstNode = true;
+  var i, node;
+  for(i=0; i < nodes.length; i++) {
+    node = nodes[i];
+    if(node.nodeType === ELEMENT_NODE) {
+      if(lastWasElement || firstNode) {
+        count += 2;
+        firstNode = false;
+      } else {
+        count++;
+      }
+      
+      if(n === node) {
+        if(node.tagName.toLowerCase() === 'img') {
+          return {count, offset};
+        } else {
+          return {count};
+        }
+      }
+      prevOffset = 0;
+      lastWasElement = true;
+    } else if (node.nodeType === TEXT_NODE ||
+               node.nodeType === CDATA_SECTION_NODE) {
+      if(lastWasElement || firstNode) {
+        count++;
+        firstNode = false;
+      }
+      
+      if(n === node) {
+        return {count, offset: offset + prevOffset};
+      }
+
+      prevOffset += node.textContent.length;
+      lastWasElement = false;
+    } else {
+      continue;
+    }
+  }
+  throw new Error("The specified node was not found in the array of siblings");
+}
+
+function compareTemporal(a, b) {
+  const isA = (typeof a === 'number');
+  const isB = (typeof b === 'number');
+
+  if(!isA && !isB) return 0;
+  if(!isA && isB) return -1;
+  if(isA && !isB) return 1;
+  
+  return (a || 0.0) - (b || 0.0);
+}
+
+function compareSpatial(a, b) {
+  if(!a && !b) return 0;
+  if(!a && b) return -1;
+  if(a && !b) return 1;
+
+  var diff = (a.y || 0) - (b.y || 0);
+  if(diff) return diff;
+
+  return (a.x || 0) - (b.x || 0);
+}
+
+class CFI {
+
+  constructor(str, opts) {
+    this.opts = Object.assign({
+      // If CFI is a Simple Range, pretend it isn't
+      // by parsing only the start of the range
+      flattenRange: false,
+      // Strip temporal, spatial, offset and textLocationAssertion
+      // from places where they don't make sense
+      stricter: true
+    }, opts || {});
+    
+    this.cfi = str;
+    const isCFI = new RegExp(/^epubcfi\((.*)\)$/);
+    
+    str = str.trim();
+    var m = str.match(isCFI);
+    if(!m) throw new Error("Not a valid CFI");
+    if(m.length < 2) return; // Empty CFI
+
+    str = m[1];
+    this.parts = [];
+
+    var parsed, offset, newDoc;
+    var subParts = [];
+    var sawComma = 0;
+    while(str.length) {
+      ({parsed, offset, newDoc} = this.parse(str));
+      if(!parsed || offset === null) throw new Error("Parsing failed");
+      if(sawComma && newDoc) throw new Error("CFI is a range that spans multiple documents. This is not allowed");
+      
+      subParts.push(parsed);
+
+      // Handle end of string
+      if(newDoc || str.length - offset <= 0) {
+        // Handle end if this was a range
+        if(sawComma === 2) {
+          this.to = subParts;
+        } else { // not a range
+          this.parts.push(subParts);
+        }
+        subParts = [];
+      }
+      
+      str = str.slice(offset);
+      
+      // Handle Simple Ranges
+      if(str[0] === ',') {
+        if(sawComma === 0) {
+          if(subParts.length) {
+            this.parts.push(subParts);
+          }
+          subParts = [];
+        } else if(sawComma === 1) {
+          if(subParts.length) {
+            this.from = subParts;
+          }
+          subParts = [];
+        }
+        str = str.slice(1);
+        sawComma++;
+      }
+    }
+    if(this.from && this.from.length) {
+      if(this.opts.flattenRange || !this.to || !this.to.length) {
+        this.parts = this.parts.concat(this.from);
+        delete this.from;
+        delete this.to;
+      } else {
+        this.isRange = true;
+      }
+    }
+    if(this.opts.stricter) {
+      this.removeIllegalOpts();
+    }
+  }
+
+  removeIllegalOpts(parts) {
+    if(!parts) {
+      if(this.from) {
+        this.removeIllegalOpts(this.from);
+        if(!this.to) return;
+        parts = this.to;
+      } else {
+        parts = this.parts;
+      }
+    }
+
+    var i, j, part, subpart;
+    for(i=0; i < parts.length; i++) {
+      part = parts[i];
+      for(j=0; j < part.length - 1; j++) {
+        subpart = part[j];
+        delete subpart.temporal;
+        delete subpart.spatial;
+        delete subpart.offset;
+        delete subpart.textLocationAssertion;
+      }
+    }
+  }
+
+  static generatePart(node, offset, extra) {
+    
+    var cfi = '';
+    var o;
+
+    // The leading path of CFI corresponding to the 'spine' element must be relative 
+    // to the ancestor 'package' element. If this is a spine child element, we need
+    // to stop traversing when we reach the 'package' node.  
+    var isSpineElement = node.parentNode.nodeName === 'spine' ? true : false;
+
+    while(node.parentNode) {
+      o = calcSiblingCount(node.parentNode.childNodes, node, offset);
+      if(!cfi && o.offset) cfi = ':'+o.offset;
+      
+      cfi = '/'+o.count+((node.id) ? '['+cfiEscape(node.id)+']' : '') + cfi;
+      
+      node = node.parentNode;
+
+      if(isSpineElement && node.nodeName === 'package'){
+        break;
+      }
+    }
+    
+    return cfi;
+  }
+  
+  static generate(node, offset, extra) {
+    var cfi;
+    
+    if(node instanceof Array) {
+      var strs = [];
+      for(let o of node) {
+        strs.push(this.generatePart(o.node, o.offset));
+      }
+      cfi = strs.join('!');
+    } else {
+      cfi = this.generatePart(node, offset, extra);
+    }
+
+    if(extra) cfi += extra;
+    
+    return 'epubcfi('+cfi+')';
+  }
+
+  static toParsed(cfi) {
+    if(typeof cfi === 'string') cfi = new this(cfi);
+    if(cfi.isRange) {
+      return cfi.getFrom();
+    } else {
+      return cfi.get();
+    }
+  }
+
+
+  // Takes two CFI paths and compares them
+  static comparePath(a, b) {
+    const max = Math.max(a.length, b.length);
+    
+    var i, cA, cB, diff;
+    for(i=0; i < max; i++) {
+      cA = a[i];
+      cB = b[i];
+      if(!cA) return -1;
+      if(!cB) return 1;
+
+      diff = this.compareParts(cA, cB);
+      if(diff) return diff;
+    }
+    return 0;
+  }
+
+  // Sort an array of CFI objects
+  static sort(a) {
+    a.sort((a, b) => {
+      return this.compare(a, b)
+    });
+  }
+  
+  // Takes two CFI objects and compares them.
+  static compare(a, b) {
+    var oA = a.get();
+    var oB = b.get();
+    if(a.isRange || b.isRange) {
+      if(a.isRange && b.isRange) {
+        var diff = this.comparePath(oA.from, oB.from);
+        if(diff) return diff;
+        return this.comparePath(oA.to, oB.to);
+      }
+      if(a.isRange) oA = oA.from;
+      if(b.isRange) oB = oB.from;
+
+      return this.comparePath(oA, oB);
+      
+    } else { // neither a nor b is a range
+      
+      return this.comparePath(oA, oB);
+    }
+  }
+  
+  // Takes two parsed path parts (assuming path is split on '!') and compares them.
+  static compareParts(a, b) {
+    const max = Math.max(a.length, b.length);
+    
+    var i, cA, cB, diff;
+    for(i=0; i < max; i++) {
+      cA = a[i];
+      cB = b[i];
+      if(!cA) return -1;
+      if(!cB) return 1;
+      
+      diff = cA.nodeIndex - cB.nodeIndex;
+      if(diff) return diff;
+
+      // The paths must be equal if the "before the first node" syntax is used
+      // and this must be the last subpart (assuming a valid CFI)
+      if(cA.nodeIndex === 0) {
+        return 0;
+      }
+      
+      // Don't bother comparing offsets, temporals or spatials
+      // unless we're on the last element, since they're not
+      // supposed to be on elements other than the last
+      if(i < max - 1) continue;
+      
+      // Only compare spatials or temporals for element nodes
+      if(cA.nodeIndex % 2 === 0) {
+        
+        diff = compareTemporal(cA.temporal, cB.temporal);
+        if(diff) return diff;
+        
+        diff = compareSpatial(cA.spatial, cB.spatial);
+        if(diff) return diff;
+        
+      }
+
+      diff = (cA.offset || 0) - (cB.offset || 0);
+      if(diff) return diff;
+    }
+    return 0;
+  }
+  
+  decodeEntities(dom, str) {
+    try {
+      const el = dom.createElement('textarea');
+      el.innerHTML = str;
+      return el.valueOf();
+    } catch(err) {
+      // TODO fall back to simpler decode?
+      // e.g. regex match for stuff like &#160; and &nbsp;
+      return str;
+    }
+  }
+  
+  // decode HTML/XML entities and compute length
+  trueLength(dom, str) {
+      let x=this.decodeEntities(dom, str);
+    return x.length;
+  }
+  
+  getFrom() {
+    if(!this.isRange) throw new Error("Trying to get beginning of non-range CFI");
+    if(!this.from) {
+      return this.deepClone(this.parts);
+    }
+    const parts = this.deepClone(this.parts);
+    parts[parts.length-1] = parts[parts.length-1].concat(this.from);
+    return parts;
+  }
+
+  getTo()  {
+    if(!this.isRange) throw new Error("Trying to get end of non-range CFI");
+    const parts = this.deepClone(this.parts);
+    parts[parts.length-1] = parts[parts.length-1].concat(this.to);
+    return parts
+  }
+  
+  get() {
+    if(this.isRange) {
+      return {
+        from: this.getFrom(),
+        to: this.getTo(),
+        isRange: true
+      };
+    }
+    return this.deepClone(this.parts);
+  }
+  
+  parseSideBias(o, loc) {
+    if(!loc) return;
+    const m = loc.trim().match(/^(.*);s=([ba])$/);
+    if(!m || m.length < 3) {
+      if(typeof o.textLocationAssertion === 'object') {
+        o.textLocationAssertion.post = loc;
+      } else {
+        o.textLocationAssertion = loc;
+      }
+      return;
+    }
+    if(m[1]) {
+      if(typeof o.textLocationAssertion === 'object') {
+        o.textLocationAssertion.post = m[1];
+      } else {
+        o.textLocationAssertion = m[1];
+      }
+    }
+    
+    if(m[2] === 'a') {
+      o.sideBias = 'after';
+    } else {
+      o.sideBias = 'before';
+    }
+  }
+  
+  parseSpatialRange(range) {
+    if(!range) return undefined;
+    const m = range.trim().match(/^([\d\.]+):([\d\.]+)$/);
+    if(!m || m.length < 3) return undefined;
+    const o = {
+      x: parseInt(m[1]),
+      y: parseInt(m[2]),
+    };
+    if(typeof o.x !== 'number' || typeof o.y !== 'number') {
+      return undefined;
+    }
+    return o;
+  }
+  
+  parse(cfi) {
+    var o = {};
+    const isNumber = new RegExp(/[\d]/);
+    var f;
+    var state;
+    var prevState;
+    var cur, escape;
+    var seenColon = false;
+    var seenSlash = false;
+    var i;
+    for(i=0; i <= cfi.length; i++) {
+      if(i < cfi.length) {
+        cur = cfi[i];
+      } else {
+        cur = '';
+      }
+      if(cur === '^' && !escape) {
+        escape = true;
+        continue;
+      }
+
+      if(state === '/') {
+        if(cur.match(isNumber)) {
+          if(!f) {
+            f = cur;
+          } else {
+            f += cur;
+          }
+          escape = false;
+          continue;
+        } else {
+          if(f) {
+            o.nodeIndex = parseInt(f);
+            f = null;
+          }
+          prevState = state;
+          state = null;
+        }
+      }
+      
+      if(state === ':') {
+        if(cur.match(isNumber)) {
+          if(!f) {
+            f = cur;
+          } else {
+            f += cur;
+          }
+          escape = false;
+          continue;
+        } else {
+          if(f) {
+            o.offset = parseInt(f);
+            f = null;
+          }
+          prevState = state;
+          state = null;
+        }
+      }
+
+      if(state === '@') {
+        let done = false;
+        if(cur.match(isNumber) || cur === '.' || cur === ':') {
+          if(cur === ':') {
+            if(!seenColon) {
+              seenColon = true;
+            } else {
+              done = true;
+            }
+          }
+        } else {
+          done = true;
+        }
+        if(!done) {
+          if(!f) {
+            f = cur;
+          } else {
+            f += cur;
+          }
+          escape = false;
+          continue;
+        } else {
+          prevState = state;
+          state = null;
+          if(f && seenColon) o.spatial = this.parseSpatialRange(f);
+          f = null;
+        }
+      }
+      
+      if(state === '~' ) {
+        if(cur.match(isNumber) || cur === '.') {
+          if(!f) {
+            f = cur;
+          } else {
+            f += cur;
+          }
+          escape = false;
+          continue;
+        } else {
+          if(f) {
+            o.temporal = parseFloat(f);
+          }
+          prevState = state;
+          state = null;
+          f = null;
+        }
+      }
+      
+      if(!state) {
+        if(cur === '!') {
+          i++;
+          state = cur;
+          break;
+        }
+
+        if(cur === ',') {
+          break;
+        }
+        
+        if(cur === '/') {
+          if(seenSlash) {
+            break;
+          } else {
+            seenSlash = true;
+            prevState = state;
+            state = cur;
+            escape = false;
+            continue;
+          }
+        }
+        
+        if(cur === ':' || cur === '~' || cur === '@') {
+          if(this.opts.stricter) {
+            // We've already had a temporal or spatial indicator
+            // and offset does not make sense and the same time
+            if(cur === ':' && (typeof o.temporal !== 'undefined' || typeof o.spatial !== 'undefined')) {
+              break;
+            }
+            // We've already had an offset
+            // and temporal or spatial do not make sense at the same time
+            if((cur === '~' || cur === '@') && (typeof o.offset !== 'undefined')) {
+              break;
+            }
+          }
+          prevState = state;
+          state = cur;
+          escape = false;
+          seenColon = false; // only relevant for '@'
+          continue;
+        }        
+
+        if(cur === '[' && !escape && prevState === ':') {
+          prevState = state;
+          state = '[';
+          escape = false;
+          continue;
+        }
+
+        if(cur === '[' && !escape && prevState === '/') {
+          prevState = state;
+          state = 'nodeID';
+          escape = false;
+          continue;
+        }
+      }
+
+
+      if(state === '[') {
+        if(cur === ']' && !escape) {
+          prevState = state;
+          state = null;
+          this.parseSideBias(o, f);
+          f = null;
+        } else if(cur === ',' && !escape) {
+          o.textLocationAssertion = {};
+          if(f) {
+            o.textLocationAssertion.pre = f;
+          }
+          f = null;
+        } else {
+          if(!f) {
+            f = cur;
+          } else {
+            f += cur;
+          }
+        }
+        escape = false;
+        continue;
+      }
+
+      if(state === 'nodeID') {
+        if(cur === ']' && !escape) {
+          prevState = state;
+          state = null;
+          o.nodeID = f;
+          f = null;
+        } else {
+          if(!f) {
+            f = cur;
+          } else {
+            f += cur;
+          }
+        }
+        escape = false;
+        continue;
+      }
+      
+      escape = false;
+    }
+    
+    if(!o.nodeIndex && o.nodeIndex !== 0) throw new Error("Missing child node index in CFI");
+    
+    return {parsed: o, offset: i, newDoc: (state === '!')};
+  }
+
+  // The CFI counts child nodes differently from the DOM
+  // Retrive the child of parentNode at the specified index
+  // according to the CFI standard way of counting
+  getChildNodeByCFIIndex(dom, parentNode, index, offset) {
+    const children = parentNode.childNodes;
+    if(!children.length) return {node: parentNode, offset: 0};
+
+    // index is pointing to the virtual node before the first node
+    // as defined in the CFI spec
+    if(index <= 0) {
+      return {node: children[0], relativeToNode: 'before', offset: 0}
+    }
+      
+    var cfiCount = 0;
+    var lastChild;
+    var i, child;
+    for(i=0; i < children.length; i++) {
+      child = children[i];
+      switch(child.nodeType) {
+      case ELEMENT_NODE:
+
+        // If the previous node was also an element node
+        // then we have to pretend there was a text node in between
+        // the current and previous nodes (according to the CFI spec)
+        // so we increment cfiCount by two
+        if(cfiCount % 2 === 0) {
+          cfiCount += 2;
+          if(cfiCount >= index) {
+            if(child.tagName.toLowerCase() === 'img' && offset) {
+              return {node: child, offset}
+            }
+            return {node: child, offset: 0}
+          }
+        } else { // Previous node was a text node
+          cfiCount += 1;
+          if(cfiCount === index) {
+            if(child.tagName.toLowerCase() === 'img' && offset) {
+              return {node: child, offset}
+            }
+              
+            return {node: child, offset: 0}
+
+            // This happens when offset into the previous text node was greater
+            // than the number of characters in that text node
+            // So we return a position at the end of the previous text node
+          } else if(cfiCount > index) {
+            if(!lastChild) {
+              return {node: parentNode, offset: 0};
+            }
+            return {node: lastChild, offset: this.trueLength(dom, lastChild.textContent)};
+          }
+        }
+        lastChild = child;
+        break;
+      case TEXT_NODE:
+      case CDATA_SECTION_NODE:
+        // If this is the first node or the previous node was an element node
+        if(cfiCount === 0 || cfiCount % 2 === 0) {
+          cfiCount += 1;
+        } else {
+          // If previous node was a text node then they should be combined
+          // so we count them as one, meaning we don't increment the count
+        }
+
+        if(cfiCount === index) {
+          // If offset is greater than the length of the current text node
+          // then we assume that the next node will also be a text node
+          // and that we'll be combining them with the current node
+          let trueLength = this.trueLength(dom, child.textContent);
+
+          if(offset >= trueLength) {
+            offset -= trueLength;
+          } else {
+            return {node: child, offset: offset}
+          }
+        }
+        lastChild = child;
+        break;
+      default:
+        continue
+      }
+    }
+
+    // index is pointing to the virtual node after the last child
+    // as defined in the CFI spec
+    if(index > cfiCount) {
+      var o = {relativeToNode: 'after', offset: 0};
+      if(!lastChild) {
+        o.node = parentNode;
+      } else {
+        o.node = lastChild;
+      }
+      if(this.isTextNode(o.node)) {
+        o.offset = this.trueLength(dom, o.node.textContent.length);
+      }
+      return o;
+    }  
+  }
+
+  isTextNode(node) {
+    if(!node) return false;
+    if(node.nodeType === TEXT_NODE || node.nodeType === CDATA_SECTION_NODE) {
+      return true;
+    }
+    return false;
+  }
+
+  // Use a Text Location Assertion to correct and offset
+  correctOffset(dom, node, offset, assertion) {
+    var curNode = node;
+
+    if(typeof assertion === 'string') {
+      var matchStr = this.decodeEntities(dom, assertion);
+    } else {
+      assertion.pre = this.decodeEntities(dom, assertion.pre);
+      assertion.post = this.decodeEntities(dom, assertion.post);
+      var matchStr = assertion.pre + '.' + assertion.post;
+    }
+
+    if(!(this.isTextNode(node))) {
+      return {node, offset: 0};
+    }
+    
+    while(this.isTextNode(curNode.previousSibling)) {
+      curNode = curNode.previousSibling;
+    }
+
+    const startNode = curNode;
+    var str;
+    const nodeLengths = [];
+    var txt = '';
+    var i = 0;
+    while(this.isTextNode(curNode)) {
+
+      str = this.decodeEntities(dom, curNode.textContent);
+      nodeLengths[i] = str.length;
+      txt += str;
+      
+      if(!curNode.nextSibling) break;
+      curNode = curNode.nextSibling;
+      i++;
+    }
+
+    // Find all matches to the Text Location Assertion
+    const matchOffset = (assertion.pre) ? assertion.pre.length : 0;
+    const m = matchAll(txt, new RegExp(matchStr), matchOffset);
+    if(!m.length) return {node, offset};
+    
+    // Get the match that has the closest offset to the existing offset
+    var newOffset = closest(m, offset);
+    
+    if(curNode === node && newOffset === offset) {
+      return {node, offset};
+    }
+
+    i = 0;
+    curNode = startNode;
+    while(newOffset >= nodeLengths[i]) {
+
+      newOffset -= nodeLengths[i];
+      if(newOffset < 0) return {node, offset}
+
+      if(!curNode.nextSibling || i+1 >= nodeOffsets.length) return {node, offset}
+      i++;
+      curNode = curNode.nextSibling;
+    }
+
+    return {node: curNode, offset: newOffset};
+  }
+  
+  resolveNode(index, subparts, dom, opts) {
+    opts = Object.assign({}, opts || {});
+    if(!dom) throw new Error("Missing DOM argument");
+    
+    // Traverse backwards until a subpart with a valid ID is found
+    // or the first subpart is reached
+    var startNode;
+    if(index === 0) {
+      startNode = dom.querySelector('package');
+    }
+    
+    if(!startNode) {
+      for(let n of dom.childNodes) {
+        if(n.nodeType === ELEMENT_NODE) {
+          startNode = n;
+          break;
+        }
+      }
+    }
+    if(!startNode) throw new Error("Document incompatible with CFIs");
+
+    var node = startNode;
+    var startFrom = 0;
+    var i, subpart;
+    for(i=subparts.length-1; i >=0; i--) {
+      subpart = subparts[i];
+      if(!opts.ignoreIDs && subpart.nodeID && (node = dom.getElementById(subpart.nodeID))) {
+        startFrom = i + 1;
+        break;
+      }
+    }
+
+    if(!node) {
+      node = startNode;
+    }
+    
+    var o = {node, offset: 0};
+    
+    var nodeIndex;
+    for(i=startFrom; i < subparts.length; i++) {
+      subpart = subparts[i];
+
+      o = this.getChildNodeByCFIIndex(dom, o.node, subpart.nodeIndex, subpart.offset);
+
+      if(subpart.textLocationAssertion) {
+        o = this.correctOffset(dom, o.node, subpart.offset, subpart.textLocationAssertion);
+      }
+    }
+    
+    return o;
+  }
+  
+  // Each part of a CFI (as separated by '!')
+  // references a separate HTML/XHTML/XML document.
+  // This function takes an index specifying the part
+  // of the CFI and the appropriate Document or XMLDocument
+  // that is referenced by the specified part of the CFI
+  // and returns the URI for the document referenced by
+  // the next part of the CFI
+  // If the opt `ignoreIDs` is true then IDs
+  // will not be used while resolving
+  resolveURI(index, dom, opts) {
+    opts = opts || {};
+    if(index < 0 || index > this.parts.length - 2) {
+      throw new Error("index is out of bounds");
+    }
+
+    const subparts = this.parts[index];
+    if(!subparts) throw new Error("Missing CFI part for index: " + index);
+    
+    var o = this.resolveNode(index, subparts, dom, opts);
+    var node = o.node;
+
+    const tagName = node.tagName.toLowerCase();
+    if(tagName === 'itemref'
+       && node.parentNode.tagName.toLowerCase() === 'spine') {
+
+      const idref = node.getAttribute('idref');
+      if(!idref) throw new Error("Referenced node had not 'idref' attribute");
+      node = dom.getElementById(idref);
+      if(!node) throw new Error("Specified node is missing from manifest");
+      const href = node.getAttribute('href');
+      if(!href) throw new Error("Manifest item is missing href attribute");
+      
+      return href;
+    }
+
+    if(tagName === 'iframe' || tagName === 'embed') {
+      const src = node.getAttribute('src');
+      if(!src) throw new Error(tagName + " element is missing 'src' attribute");
+      return src;
+    }
+
+    if(tagName === 'object') {
+      const data = node.getAttribute('data');
+      if(!data) throw new Error(tagName + " element is missing 'data' attribute");
+      return data;
+    }
+
+    if(tagName === 'image'|| tagName === 'use') {
+      const href = node.getAttribute('xlink:href');
+      if(!href) throw new Error(tagName + " element is missing 'xlink:href' attribute");
+      return href;
+    }
+
+    throw new Error("No URI found");
+  }
+
+  deepClone(o) {
+    return JSON.parse(JSON.stringify(o));
+  }
+
+  resolveLocation(dom, parts) {
+    const index = parts.length - 1;
+    const subparts = parts[index];
+    if(!subparts) throw new Error("Missing CFI part for index: " + index);
+    var o = this.resolveNode(index, subparts, dom);
+    
+    var lastpart = this.deepClone(subparts[subparts.length - 1]);
+    
+    delete lastpart.nodeIndex;
+    if(!lastpart.offset) delete o.offset;
+    
+    Object.assign(lastpart, o);
+    
+    return lastpart;    
+  }
+  
+  // Takes the Document or XMLDocument for the final
+  // document referenced by the CFI
+  // and returns the node and offset into that node
+  resolveLast(dom, opts) {
+    opts = Object.assign({
+      range: false
+    }, opts || {});
+    
+    if(!this.isRange) {
+      return this.resolveLocation(dom, this.parts);
+    }
+
+    if(opts.range) {
+      const range = dom.createRange();
+      const from = this.getFrom();
+      if(from.relativeToNode === 'before') {
+        range.setStartBefore(from.node, from.offset)
+      } else if(from.relativeToNode === 'after') {
+        range.setStartAfter(from.node, from.offset)
+      } else {
+        range.setStart(from.node, from.offset);
+      }
+
+      const to = this.getTo();
+      if(to.relativeToNode === 'before') {
+        range.setEndBefore(to.node, to.offset)
+      } else if(to.relativeToNode === 'after') {
+        range.setEndAfter(to.node, to.offset)
+      } else {
+        range.setEnd(to.node, to.offset);
+      }
+
+      return range;
+    }
+    
+    return {
+      from: this.resolveLocation(dom, this.getFrom()),
+      to: this.resolveLocation(dom, this.getTo()),
+      isRange: true
+    };
+  }
+
+  async fetchAndParse(uri) {
+    return new Promise((resolv, reject) => {
+      
+      const xhr = new XMLHttpRequest;
+      
+      xhr.open('GET', uri);
+      xhr.responseType = 'document';
+      
+      xhr.onload = function() {
+        if(xhr.readyState === xhr.DONE) {
+          if(xhr.status < 200 || xhr.status >= 300) {
+            reject(new Error("Failed to get: " + uri));
+            return;
+          }
+          resolv(xhr.responseXML);
+        }
+      }
+      xhr.onerror = function() {
+        reject(new Error("Failed to get: " + uri));
+      }
+      
+      xhr.send();
+    });
+  }
+  
+  async resolve(uriOrDoc, fetchCB, opts) {
+    if(typeof fetchCB !== 'function') {
+      opts = fetchCB;
+      fetchCB = null
+    }
+    if(!fetchCB) {
+      if(typeof XMLHttpRequest === 'undefined') {
+        throw new Error("XMLHttpRequest not available. You must supply a function as the second argument.");
+      }
+      fetchCB = this.fetchAndParse;
+    }
+    
+    var uri, doc;
+    if(typeof uriOrDoc === 'string') {
+      uri = uriOrDoc;
+    } else {
+      doc = uriOrDoc;
+    }
+    var i, part, uri;
+    for(i=0; i < this.parts.length - 1; i++) {
+      if(uri) doc = await fetchCB(uri);
+      uri = this.resolveURI(i, doc, opts);
+    }
+
+    if(uri) doc = await fetchCB(uri);
+    return this.resolveLast(doc, opts);
+  }
+  
+}
+
+//module.exports = CFI;
+
+
diff --git a/cps/static/js/libs/pako.min.js b/cps/static/js/libs/pako.min.js
new file mode 100644
index 00000000..2535eafc
--- /dev/null
+++ b/cps/static/js/libs/pako.min.js
@@ -0,0 +1,2 @@
+/*! pako 2.1.0 https://github.com/nodeca/pako @license (MIT AND Zlib) */
+!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e((t="undefined"!=typeof globalThis?globalThis:t||self).pako={})}(this,(function(t){"use strict";function e(t){let e=t.length;for(;--e>=0;)t[e]=0}const a=256,i=286,n=30,s=15,r=new Uint8Array([0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0]),o=new Uint8Array([0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13]),l=new Uint8Array([0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7]),h=new Uint8Array([16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15]),d=new Array(576);e(d);const _=new Array(60);e(_);const f=new Array(512);e(f);const c=new Array(256);e(c);const u=new Array(29);e(u);const w=new Array(n);function m(t,e,a,i,n){this.static_tree=t,this.extra_bits=e,this.extra_base=a,this.elems=i,this.max_length=n,this.has_stree=t&&t.length}let b,g,p;function k(t,e){this.dyn_tree=t,this.max_code=0,this.stat_desc=e}e(w);const v=t=>t<256?f[t]:f[256+(t>>>7)],y=(t,e)=>{t.pending_buf[t.pending++]=255&e,t.pending_buf[t.pending++]=e>>>8&255},x=(t,e,a)=>{t.bi_valid>16-a?(t.bi_buf|=e<<t.bi_valid&65535,y(t,t.bi_buf),t.bi_buf=e>>16-t.bi_valid,t.bi_valid+=a-16):(t.bi_buf|=e<<t.bi_valid&65535,t.bi_valid+=a)},z=(t,e,a)=>{x(t,a[2*e],a[2*e+1])},A=(t,e)=>{let a=0;do{a|=1&t,t>>>=1,a<<=1}while(--e>0);return a>>>1},E=(t,e,a)=>{const i=new Array(16);let n,r,o=0;for(n=1;n<=s;n++)o=o+a[n-1]<<1,i[n]=o;for(r=0;r<=e;r++){let e=t[2*r+1];0!==e&&(t[2*r]=A(i[e]++,e))}},R=t=>{let e;for(e=0;e<i;e++)t.dyn_ltree[2*e]=0;for(e=0;e<n;e++)t.dyn_dtree[2*e]=0;for(e=0;e<19;e++)t.bl_tree[2*e]=0;t.dyn_ltree[512]=1,t.opt_len=t.static_len=0,t.sym_next=t.matches=0},Z=t=>{t.bi_valid>8?y(t,t.bi_buf):t.bi_valid>0&&(t.pending_buf[t.pending++]=t.bi_buf),t.bi_buf=0,t.bi_valid=0},U=(t,e,a,i)=>{const n=2*e,s=2*a;return t[n]<t[s]||t[n]===t[s]&&i[e]<=i[a]},S=(t,e,a)=>{const i=t.heap[a];let 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dictionary",1:"stream end",0:"","-1":"file error","-2":"stream error","-3":"data error","-4":"insufficient memory","-5":"buffer error","-6":"incompatible version"},K={Z_NO_FLUSH:0,Z_PARTIAL_FLUSH:1,Z_SYNC_FLUSH:2,Z_FULL_FLUSH:3,Z_FINISH:4,Z_BLOCK:5,Z_TREES:6,Z_OK:0,Z_STREAM_END:1,Z_NEED_DICT:2,Z_ERRNO:-1,Z_STREAM_ERROR:-2,Z_DATA_ERROR:-3,Z_MEM_ERROR:-4,Z_BUF_ERROR:-5,Z_NO_COMPRESSION:0,Z_BEST_SPEED:1,Z_BEST_COMPRESSION:9,Z_DEFAULT_COMPRESSION:-1,Z_FILTERED:1,Z_HUFFMAN_ONLY:2,Z_RLE:3,Z_FIXED:4,Z_DEFAULT_STRATEGY:0,Z_BINARY:0,Z_TEXT:1,Z_UNKNOWN:2,Z_DEFLATED:8};const{_tr_init:P,_tr_stored_block:Y,_tr_flush_block:G,_tr_tally:X,_tr_align:W}=B,{Z_NO_FLUSH:q,Z_PARTIAL_FLUSH:J,Z_FULL_FLUSH:Q,Z_FINISH:V,Z_BLOCK:$,Z_OK:tt,Z_STREAM_END:et,Z_STREAM_ERROR:at,Z_DATA_ERROR:it,Z_BUF_ERROR:nt,Z_DEFAULT_COMPRESSION:st,Z_FILTERED:rt,Z_HUFFMAN_ONLY:ot,Z_RLE:lt,Z_FIXED:ht,Z_DEFAULT_STRATEGY:dt,Z_UNKNOWN:_t,Z_DEFLATED:ft}=K,ct=258,ut=262,wt=42,mt=113,bt=666,gt=(t,e)=>(t.msg=j[e],e),pt=t=>2*t-(t>4?9:0),kt=t=>{let e=t.length;for(;--e>=0;)t[e]=0},vt=t=>{let e,a,i,n=t.w_size;e=t.hash_size,i=e;do{a=t.head[--i],t.head[i]=a>=n?a-n:0}while(--e);e=n,i=e;do{a=t.prev[--i],t.prev[i]=a>=n?a-n:0}while(--e)};let yt=(t,e,a)=>(e<<t.hash_shift^a)&t.hash_mask;const xt=t=>{const e=t.state;let a=e.pending;a>t.avail_out&&(a=t.avail_out),0!==a&&(t.output.set(e.pending_buf.subarray(e.pending_out,e.pending_out+a),t.next_out),t.next_out+=a,e.pending_out+=a,t.total_out+=a,t.avail_out-=a,e.pending-=a,0===e.pending&&(e.pending_out=0))},zt=(t,e)=>{G(t,t.block_start>=0?t.block_start:-1,t.strstart-t.block_start,e),t.block_start=t.strstart,xt(t.strm)},At=(t,e)=>{t.pending_buf[t.pending++]=e},Et=(t,e)=>{t.pending_buf[t.pending++]=e>>>8&255,t.pending_buf[t.pending++]=255&e},Rt=(t,e,a,i)=>{let n=t.avail_in;return n>i&&(n=i),0===n?0:(t.avail_in-=n,e.set(t.input.subarray(t.next_in,t.next_in+n),a),1===t.state.wrap?t.adler=C(t.adler,e,n,a):2===t.state.wrap&&(t.adler=H(t.adler,e,n,a)),t.next_in+=n,t.total_in+=n,n)},Zt=(t,e)=>{let a,i,n=t.max_chain_length,s=t.strstart,r=t.prev_length,o=t.nice_match;const l=t.strstart>t.w_size-ut?t.strstart-(t.w_size-ut):0,h=t.window,d=t.w_mask,_=t.prev,f=t.strstart+ct;let c=h[s+r-1],u=h[s+r];t.prev_length>=t.good_match&&(n>>=2),o>t.lookahead&&(o=t.lookahead);do{if(a=e,h[a+r]===u&&h[a+r-1]===c&&h[a]===h[s]&&h[++a]===h[s+1]){s+=2,a++;do{}while(h[++s]===h[++a]&&h[++s]===h[++a]&&h[++s]===h[++a]&&h[++s]===h[++a]&&h[++s]===h[++a]&&h[++s]===h[++a]&&h[++s]===h[++a]&&h[++s]===h[++a]&&s<f);if(i=ct-(f-s),s=f-ct,i>r){if(t.match_start=e,r=i,i>=o)break;c=h[s+r-1],u=h[s+r]}}}while((e=_[e&d])>l&&0!=--n);return r<=t.lookahead?r:t.lookahead},Ut=t=>{const e=t.w_size;let a,i,n;do{if(i=t.window_size-t.lookahead-t.strstart,t.strstart>=e+(e-ut)&&(t.window.set(t.window.subarray(e,e+e-i),0),t.match_start-=e,t.strstart-=e,t.block_start-=e,t.insert>t.strstart&&(t.insert=t.strstart),vt(t),i+=e),0===t.strm.avail_in)break;if(a=Rt(t.strm,t.window,t.strstart+t.lookahead,i),t.lookahead+=a,t.lookahead+t.insert>=3)for(n=t.strstart-t.insert,t.ins_h=t.window[n],t.ins_h=yt(t,t.ins_h,t.window[n+1]);t.insert&&(t.ins_h=yt(t,t.ins_h,t.window[n+3-1]),t.prev[n&t.w_mask]=t.head[t.ins_h],t.head[t.ins_h]=n,n++,t.insert--,!(t.lookahead+t.insert<3)););}while(t.lookahead<ut&&0!==t.strm.avail_in)},St=(t,e)=>{let a,i,n,s=t.pending_buf_size-5>t.w_size?t.w_size:t.pending_buf_size-5,r=0,o=t.strm.avail_in;do{if(a=65535,n=t.bi_valid+42>>3,t.strm.avail_out<n)break;if(n=t.strm.avail_out-n,i=t.strstart-t.block_start,a>i+t.strm.avail_in&&(a=i+t.strm.avail_in),a>n&&(a=n),a<s&&(0===a&&e!==V||e===q||a!==i+t.strm.avail_in))break;r=e===V&&a===i+t.strm.avail_in?1:0,Y(t,0,0,r),t.pending_buf[t.pending-4]=a,t.pending_buf[t.pending-3]=a>>8,t.pending_buf[t.pending-2]=~a,t.pending_buf[t.pending-1]=~a>>8,xt(t.strm),i&&(i>a&&(i=a),t.strm.output.set(t.window.subarray(t.block_start,t.block_start+i),t.strm.next_out),t.strm.next_out+=i,t.strm.avail_out-=i,t.strm.total_out+=i,t.block_start+=i,a-=i),a&&(Rt(t.strm,t.strm.output,t.strm.next_out,a),t.strm.next_out+=a,t.strm.avail_out-=a,t.strm.total_out+=a)}while(0===r);return o-=t.strm.avail_in,o&&(o>=t.w_size?(t.matches=2,t.window.set(t.strm.input.subarray(t.strm.next_in-t.w_size,t.strm.next_in),0),t.strstart=t.w_size,t.insert=t.strstart):(t.window_size-t.strstart<=o&&(t.strstart-=t.w_size,t.window.set(t.window.subarray(t.w_size,t.w_size+t.strstart),0),t.matches<2&&t.matches++,t.insert>t.strstart&&(t.insert=t.strstart)),t.window.set(t.strm.input.subarray(t.strm.next_in-o,t.strm.next_in),t.strstart),t.strstart+=o,t.insert+=o>t.w_size-t.insert?t.w_size-t.insert:o),t.block_start=t.strstart),t.high_water<t.strstart&&(t.high_water=t.strstart),r?4:e!==q&&e!==V&&0===t.strm.avail_in&&t.strstart===t.block_start?2:(n=t.window_size-t.strstart,t.strm.avail_in>n&&t.block_start>=t.w_size&&(t.block_start-=t.w_size,t.strstart-=t.w_size,t.window.set(t.window.subarray(t.w_size,t.w_size+t.strstart),0),t.matches<2&&t.matches++,n+=t.w_size,t.insert>t.strstart&&(t.insert=t.strstart)),n>t.strm.avail_in&&(n=t.strm.avail_in),n&&(Rt(t.strm,t.window,t.strstart,n),t.strstart+=n,t.insert+=n>t.w_size-t.insert?t.w_size-t.insert:n),t.high_water<t.strstart&&(t.high_water=t.strstart),n=t.bi_valid+42>>3,n=t.pending_buf_size-n>65535?65535:t.pending_buf_size-n,s=n>t.w_size?t.w_size:n,i=t.strstart-t.block_start,(i>=s||(i||e===V)&&e!==q&&0===t.strm.avail_in&&i<=n)&&(a=i>n?n:i,r=e===V&&0===t.strm.avail_in&&a===i?1:0,Y(t,t.block_start,a,r),t.block_start+=a,xt(t.strm)),r?3:1)},Dt=(t,e)=>{let a,i;for(;;){if(t.lookahead<ut){if(Ut(t),t.lookahead<ut&&e===q)return 1;if(0===t.lookahead)break}if(a=0,t.lookahead>=3&&(t.ins_h=yt(t,t.ins_h,t.window[t.strstart+3-1]),a=t.prev[t.strstart&t.w_mask]=t.head[t.ins_h],t.head[t.ins_h]=t.strstart),0!==a&&t.strstart-a<=t.w_size-ut&&(t.match_length=Zt(t,a)),t.match_length>=3)if(i=X(t,t.strstart-t.match_start,t.match_length-3),t.lookahead-=t.match_length,t.match_length<=t.max_lazy_match&&t.lookahead>=3){t.match_length--;do{t.strstart++,t.ins_h=yt(t,t.ins_h,t.window[t.strstart+3-1]),a=t.prev[t.strstart&t.w_mask]=t.head[t.ins_h],t.head[t.ins_h]=t.strstart}while(0!=--t.match_length);t.strstart++}else t.strstart+=t.match_length,t.match_length=0,t.ins_h=t.window[t.strstart],t.ins_h=yt(t,t.ins_h,t.window[t.strstart+1]);else i=X(t,0,t.window[t.strstart]),t.lookahead--,t.strstart++;if(i&&(zt(t,!1),0===t.strm.avail_out))return 1}return t.insert=t.strstart<2?t.strstart:2,e===V?(zt(t,!0),0===t.strm.avail_out?3:4):t.sym_next&&(zt(t,!1),0===t.strm.avail_out)?1:2},Tt=(t,e)=>{let a,i,n;for(;;){if(t.lookahead<ut){if(Ut(t),t.lookahead<ut&&e===q)return 1;if(0===t.lookahead)break}if(a=0,t.lookahead>=3&&(t.ins_h=yt(t,t.ins_h,t.window[t.strstart+3-1]),a=t.prev[t.strstart&t.w_mask]=t.head[t.ins_h],t.head[t.ins_h]=t.strstart),t.prev_length=t.match_length,t.prev_match=t.match_start,t.match_length=2,0!==a&&t.prev_length<t.max_lazy_match&&t.strstart-a<=t.w_size-ut&&(t.match_length=Zt(t,a),t.match_length<=5&&(t.strategy===rt||3===t.match_length&&t.strstart-t.match_start>4096)&&(t.match_length=2)),t.prev_length>=3&&t.match_length<=t.prev_length){n=t.strstart+t.lookahead-3,i=X(t,t.strstart-1-t.prev_match,t.prev_length-3),t.lookahead-=t.prev_length-1,t.prev_length-=2;do{++t.strstart<=n&&(t.ins_h=yt(t,t.ins_h,t.window[t.strstart+3-1]),a=t.prev[t.strstart&t.w_mask]=t.head[t.ins_h],t.head[t.ins_h]=t.strstart)}while(0!=--t.prev_length);if(t.match_available=0,t.match_length=2,t.strstart++,i&&(zt(t,!1),0===t.strm.avail_out))return 1}else if(t.match_available){if(i=X(t,0,t.window[t.strstart-1]),i&&zt(t,!1),t.strstart++,t.lookahead--,0===t.strm.avail_out)return 1}else t.match_available=1,t.strstart++,t.lookahead--}return t.match_available&&(i=X(t,0,t.window[t.strstart-1]),t.match_available=0),t.insert=t.strstart<2?t.strstart:2,e===V?(zt(t,!0),0===t.strm.avail_out?3:4):t.sym_next&&(zt(t,!1),0===t.strm.avail_out)?1:2};function Ot(t,e,a,i,n){this.good_length=t,this.max_lazy=e,this.nice_length=a,this.max_chain=i,this.func=n}const It=[new Ot(0,0,0,0,St),new Ot(4,4,8,4,Dt),new Ot(4,5,16,8,Dt),new Ot(4,6,32,32,Dt),new Ot(4,4,16,16,Tt),new Ot(8,16,32,32,Tt),new Ot(8,16,128,128,Tt),new Ot(8,32,128,256,Tt),new Ot(32,128,258,1024,Tt),new Ot(32,258,258,4096,Tt)];function Ft(){this.strm=null,this.status=0,this.pending_buf=null,this.pending_buf_size=0,this.pending_out=0,this.pending=0,this.wrap=0,this.gzhead=null,this.gzindex=0,this.method=ft,this.last_flush=-1,this.w_size=0,this.w_bits=0,this.w_mask=0,this.window=null,this.window_size=0,this.prev=null,this.head=null,this.ins_h=0,this.hash_size=0,this.hash_bits=0,this.hash_mask=0,this.hash_shift=0,this.block_start=0,this.match_length=0,this.prev_match=0,this.match_available=0,this.strstart=0,this.match_start=0,this.lookahead=0,this.prev_length=0,this.max_chain_length=0,this.max_lazy_match=0,this.level=0,this.strategy=0,this.good_match=0,this.nice_match=0,this.dyn_ltree=new Uint16Array(1146),this.dyn_dtree=new Uint16Array(122),this.bl_tree=new Uint16Array(78),kt(this.dyn_ltree),kt(this.dyn_dtree),kt(this.bl_tree),this.l_desc=null,this.d_desc=null,this.bl_desc=null,this.bl_count=new Uint16Array(16),this.heap=new Uint16Array(573),kt(this.heap),this.heap_len=0,this.heap_max=0,this.depth=new Uint16Array(573),kt(this.depth),this.sym_buf=0,this.lit_bufsize=0,this.sym_next=0,this.sym_end=0,this.opt_len=0,this.static_len=0,this.matches=0,this.insert=0,this.bi_buf=0,this.bi_valid=0}const Lt=t=>{if(!t)return 1;const e=t.state;return!e||e.strm!==t||e.status!==wt&&57!==e.status&&69!==e.status&&73!==e.status&&91!==e.status&&103!==e.status&&e.status!==mt&&e.status!==bt?1:0},Nt=t=>{if(Lt(t))return gt(t,at);t.total_in=t.total_out=0,t.data_type=_t;const e=t.state;return e.pending=0,e.pending_out=0,e.wrap<0&&(e.wrap=-e.wrap),e.status=2===e.wrap?57:e.wrap?wt:mt,t.adler=2===e.wrap?0:1,e.last_flush=-2,P(e),tt},Bt=t=>{const e=Nt(t);var a;return e===tt&&((a=t.state).window_size=2*a.w_size,kt(a.head),a.max_lazy_match=It[a.level].max_lazy,a.good_match=It[a.level].good_length,a.nice_match=It[a.level].nice_length,a.max_chain_length=It[a.level].max_chain,a.strstart=0,a.block_start=0,a.lookahead=0,a.insert=0,a.match_length=a.prev_length=2,a.match_available=0,a.ins_h=0),e},Ct=(t,e,a,i,n,s)=>{if(!t)return at;let r=1;if(e===st&&(e=6),i<0?(r=0,i=-i):i>15&&(r=2,i-=16),n<1||n>9||a!==ft||i<8||i>15||e<0||e>9||s<0||s>ht||8===i&&1!==r)return gt(t,at);8===i&&(i=9);const o=new Ft;return t.state=o,o.strm=t,o.status=wt,o.wrap=r,o.gzhead=null,o.w_bits=i,o.w_size=1<<o.w_bits,o.w_mask=o.w_size-1,o.hash_bits=n+7,o.hash_size=1<<o.hash_bits,o.hash_mask=o.hash_size-1,o.hash_shift=~~((o.hash_bits+3-1)/3),o.window=new Uint8Array(2*o.w_size),o.head=new Uint16Array(o.hash_size),o.prev=new Uint16Array(o.w_size),o.lit_bufsize=1<<n+6,o.pending_buf_size=4*o.lit_bufsize,o.pending_buf=new Uint8Array(o.pending_buf_size),o.sym_buf=o.lit_bufsize,o.sym_end=3*(o.lit_bufsize-1),o.level=e,o.strategy=s,o.method=a,Bt(t)};var Mt={deflateInit:(t,e)=>Ct(t,e,ft,15,8,dt),deflateInit2:Ct,deflateReset:Bt,deflateResetKeep:Nt,deflateSetHeader:(t,e)=>Lt(t)||2!==t.state.wrap?at:(t.state.gzhead=e,tt),deflate:(t,e)=>{if(Lt(t)||e>$||e<0)return t?gt(t,at):at;const a=t.state;if(!t.output||0!==t.avail_in&&!t.input||a.status===bt&&e!==V)return gt(t,0===t.avail_out?nt:at);const i=a.last_flush;if(a.last_flush=e,0!==a.pending){if(xt(t),0===t.avail_out)return a.last_flush=-1,tt}else if(0===t.avail_in&&pt(e)<=pt(i)&&e!==V)return gt(t,nt);if(a.status===bt&&0!==t.avail_in)return gt(t,nt);if(a.status===wt&&0===a.wrap&&(a.status=mt),a.status===wt){let e=ft+(a.w_bits-8<<4)<<8,i=-1;if(i=a.strategy>=ot||a.level<2?0:a.level<6?1:6===a.level?2:3,e|=i<<6,0!==a.strstart&&(e|=32),e+=31-e%31,Et(a,e),0!==a.strstart&&(Et(a,t.adler>>>16),Et(a,65535&t.adler)),t.adler=1,a.status=mt,xt(t),0!==a.pending)return a.last_flush=-1,tt}if(57===a.status)if(t.adler=0,At(a,31),At(a,139),At(a,8),a.gzhead)At(a,(a.gzhead.text?1:0)+(a.gzhead.hcrc?2:0)+(a.gzhead.extra?4:0)+(a.gzhead.name?8:0)+(a.gzhead.comment?16:0)),At(a,255&a.gzhead.time),At(a,a.gzhead.time>>8&255),At(a,a.gzhead.time>>16&255),At(a,a.gzhead.time>>24&255),At(a,9===a.level?2:a.strategy>=ot||a.level<2?4:0),At(a,255&a.gzhead.os),a.gzhead.extra&&a.gzhead.extra.length&&(At(a,255&a.gzhead.extra.length),At(a,a.gzhead.extra.length>>8&255)),a.gzhead.hcrc&&(t.adler=H(t.adler,a.pending_buf,a.pending,0)),a.gzindex=0,a.status=69;else if(At(a,0),At(a,0),At(a,0),At(a,0),At(a,0),At(a,9===a.level?2:a.strategy>=ot||a.level<2?4:0),At(a,3),a.status=mt,xt(t),0!==a.pending)return a.last_flush=-1,tt;if(69===a.status){if(a.gzhead.extra){let e=a.pending,i=(65535&a.gzhead.extra.length)-a.gzindex;for(;a.pending+i>a.pending_buf_size;){let n=a.pending_buf_size-a.pending;if(a.pending_buf.set(a.gzhead.extra.subarray(a.gzindex,a.gzindex+n),a.pending),a.pending=a.pending_buf_size,a.gzhead.hcrc&&a.pending>e&&(t.adler=H(t.adler,a.pending_buf,a.pending-e,e)),a.gzindex+=n,xt(t),0!==a.pending)return a.last_flush=-1,tt;e=0,i-=n}let n=new Uint8Array(a.gzhead.extra);a.pending_buf.set(n.subarray(a.gzindex,a.gzindex+i),a.pending),a.pending+=i,a.gzhead.hcrc&&a.pending>e&&(t.adler=H(t.adler,a.pending_buf,a.pending-e,e)),a.gzindex=0}a.status=73}if(73===a.status){if(a.gzhead.name){let e,i=a.pending;do{if(a.pending===a.pending_buf_size){if(a.gzhead.hcrc&&a.pending>i&&(t.adler=H(t.adler,a.pending_buf,a.pending-i,i)),xt(t),0!==a.pending)return a.last_flush=-1,tt;i=0}e=a.gzindex<a.gzhead.name.length?255&a.gzhead.name.charCodeAt(a.gzindex++):0,At(a,e)}while(0!==e);a.gzhead.hcrc&&a.pending>i&&(t.adler=H(t.adler,a.pending_buf,a.pending-i,i)),a.gzindex=0}a.status=91}if(91===a.status){if(a.gzhead.comment){let e,i=a.pending;do{if(a.pending===a.pending_buf_size){if(a.gzhead.hcrc&&a.pending>i&&(t.adler=H(t.adler,a.pending_buf,a.pending-i,i)),xt(t),0!==a.pending)return a.last_flush=-1,tt;i=0}e=a.gzindex<a.gzhead.comment.length?255&a.gzhead.comment.charCodeAt(a.gzindex++):0,At(a,e)}while(0!==e);a.gzhead.hcrc&&a.pending>i&&(t.adler=H(t.adler,a.pending_buf,a.pending-i,i))}a.status=103}if(103===a.status){if(a.gzhead.hcrc){if(a.pending+2>a.pending_buf_size&&(xt(t),0!==a.pending))return a.last_flush=-1,tt;At(a,255&t.adler),At(a,t.adler>>8&255),t.adler=0}if(a.status=mt,xt(t),0!==a.pending)return a.last_flush=-1,tt}if(0!==t.avail_in||0!==a.lookahead||e!==q&&a.status!==bt){let i=0===a.level?St(a,e):a.strategy===ot?((t,e)=>{let a;for(;;){if(0===t.lookahead&&(Ut(t),0===t.lookahead)){if(e===q)return 1;break}if(t.match_length=0,a=X(t,0,t.window[t.strstart]),t.lookahead--,t.strstart++,a&&(zt(t,!1),0===t.strm.avail_out))return 1}return 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a=qe.inflateInit2(this.strm,e.windowBits);if(a!==ta)throw new Error(j[a]);if(this.header=new Je,qe.inflateGetHeader(this.strm,this.header),e.dictionary&&("string"==typeof e.dictionary?e.dictionary=Gt(e.dictionary):"[object ArrayBuffer]"===Qe.call(e.dictionary)&&(e.dictionary=new Uint8Array(e.dictionary)),e.raw&&(a=qe.inflateSetDictionary(this.strm,e.dictionary),a!==ta)))throw new Error(j[a])}function oa(t,e){const a=new ra(e);if(a.push(t),a.err)throw a.msg||j[a.err];return a.result}ra.prototype.push=function(t,e){const a=this.strm,i=this.options.chunkSize,n=this.options.dictionary;let s,r,o;if(this.ended)return!1;for(r=e===~~e?e:!0===e?$e:Ve,"[object ArrayBuffer]"===Qe.call(t)?a.input=new Uint8Array(t):a.input=t,a.next_in=0,a.avail_in=a.input.length;;){for(0===a.avail_out&&(a.output=new Uint8Array(i),a.next_out=0,a.avail_out=i),s=qe.inflate(a,r),s===aa&&n&&(s=qe.inflateSetDictionary(a,n),s===ta?s=qe.inflate(a,r):s===na&&(s=aa));a.avail_in>0&&s===ea&&a.state.wrap>0&&0!==t[a.next_in];)qe.inflateReset(a),s=qe.inflate(a,r);switch(s){case ia:case na:case aa:case sa:return this.onEnd(s),this.ended=!0,!1}if(o=a.avail_out,a.next_out&&(0===a.avail_out||s===ea))if("string"===this.options.to){let t=Wt(a.output,a.next_out),e=a.next_out-t,n=Xt(a.output,t);a.next_out=e,a.avail_out=i-e,e&&a.output.set(a.output.subarray(t,t+e),0),this.onData(n)}else this.onData(a.output.length===a.next_out?a.output:a.output.subarray(0,a.next_out));if(s!==ta||0!==o){if(s===ea)return s=qe.inflateEnd(this.strm),this.onEnd(s),this.ended=!0,!0;if(0===a.avail_in)break}}return!0},ra.prototype.onData=function(t){this.chunks.push(t)},ra.prototype.onEnd=function(t){t===ta&&("string"===this.options.to?this.result=this.chunks.join(""):this.result=Kt(this.chunks)),this.chunks=[],this.err=t,this.msg=this.strm.msg};var la={Inflate:ra,inflate:oa,inflateRaw:function(t,e){return(e=e||{}).raw=!0,oa(t,e)},ungzip:oa,constants:K};const{Deflate:ha,deflate:da,deflateRaw:_a,gzip:fa}=le,{Inflate:ca,inflate:ua,inflateRaw:wa,ungzip:ma}=la;var ba=ha,ga=da,pa=_a,ka=fa,va=ca,ya=ua,xa=wa,za=ma,Aa=K,Ea={Deflate:ba,deflate:ga,deflateRaw:pa,gzip:ka,Inflate:va,inflate:ya,inflateRaw:xa,ungzip:za,constants:Aa};t.Deflate=ba,t.Inflate=va,t.constants=Aa,t.default=Ea,t.deflate=ga,t.deflateRaw=pa,t.gzip=ka,t.inflate=ya,t.inflateRaw=xa,t.ungzip=za,Object.defineProperty(t,"__esModule",{value:!0})}));
diff --git a/cps/static/js/reading/epub-progress.js b/cps/static/js/reading/epub-progress.js
index 61015fc5..350fc896 100644
--- a/cps/static/js/reading/epub-progress.js
+++ b/cps/static/js/reading/epub-progress.js
@@ -6,8 +6,7 @@ class EpubParser {
         this.encoder = new TextEncoder();
     }
 
-
-    getTotalByteLength() { //TODO unrealistic values
+    getTotalByteLength() {
         let size = 0;
         for (let key of Object.keys(this.files)) {
             let file = this.files[key];
@@ -36,7 +35,6 @@ class EpubParser {
         return this.parser.parseFromString(this.decompress(path), "text/xml");
     }
 
-
     getSpine() {
         return Array.from(this.opfXml.getElementsByTagName("spine")[0].children).map(node => node.getAttribute("idref"));
     }
@@ -81,71 +79,32 @@ class EpubParser {
         }
         return bytesize;
     }
+
     getIdRef(filepath){
         return this.opfXml.querySelector(`[href="${filepath}"]`).getAttribute("id");
     }
     /**
      * resolves the given cfi to the xml node it points to
-     * @param {string} cfi epub-cfi string in the form: epubcfi(/6/16[id13]!/4[id2]/4/2[doc12]/1:0)
-     * @return XML Text-Node
+     * @param {string} cfistr epub-cfi string in the form: epubcfi(/6/16[id13]!/4[id2]/4/2[doc12]/1:0)
+     * @return object with attributes "node" and "offset"
      */
-    cfiToXmlNode(cfi) {
-        let cfiPath = cfi.split("(")[1].split(")")[0];
+    cfiToXmlNode(cfistr) {
+        let cfi = new CFI(cfistr);
+        let cfiPath = cfistr.split("(")[1].split(")")[0];
         let fileId = cfiPath.split("!")[0].split("[")[1].split("]")[0];
-        let xml = this.parser.parseFromString(this.decompress(this.resolveIDref(fileId)), "text/xml");
-        let components = cfiPath.split("!")[1].split("/").slice(1);
-        let currentNode = xml.getElementsByTagName("html")[0];
-        for (const component of components) {
-            this.validateChildNodes(currentNode);
-            // console.log(currentNode);
-            // console.log(component);
-            let index = 0;
-            if (component.includes("[")) {
-                index = parseInt(component.split("[")[0]) - 1;
-                currentNode = currentNode.childNodes[index];
-                console.assert(currentNode.getAttribute("id") === component.split("[")[1].split("]")[0], "failed to resolve node");
-            } else if (component.includes(":")) {
-                index = component.split(":")[0] - 1;
-                return currentNode.childNodes[index]; //exit point
-            } else {
-                index = parseInt(component);
-                currentNode = currentNode.childNodes[index - 1];
-            }
-        }
-    }
-
-    /**
-     * inserts missing text/element nodes to keep them alternating
-     * @param {*} parentNode
-     */
-    validateChildNodes(parentNode) {
-        for (let index = 0; index < parentNode.childNodes.length;) {
-            const element = parentNode.childNodes[index];
-            if (index % 2 === 0 && element.nodeType === 1) {
-                element.parentNode.insertBefore(parentNode.ownerDocument.createTextNode(""), element);
-                continue;
-            }
-            if (index % 2 === 1 && element.nodeType === 3) {
-                element.insertBefore(parentNode.ownerDocument.createElement("")); //TODO check
-                continue;
-            }
-            index++;
-        }
-
+        return cfi.resolveLast(this.parser.parseFromString(this.decompress(this.resolveIDref(fileId)),"text/xml"));
     }
 
     /**
      takes the node that the cfi points at and counts the bytes of all nodes before that
      */
     getCurrentFileProgress(CFI) {
-        let size = parseInt(CFI.split(":")[1])//text offset in node
-        let startnode = this.cfiToXmlNode(CFI); //returns text node
+        let parse=this.cfiToXmlNode(CFI);
+        let size=parse.offset;
+        let startnode =  parse.node//returns text node
         let xmlnsLength = startnode.parentNode.namespaceURI.length;
         let prev = startnode.parentNode.previousElementSibling;
         while (prev !== null) {
-            // console.log("size: "+size)
-            // console.log(prev.outerHTML)
-            // console.log(this.encoder.encode(prev.outerHTML).length - xmlnsLength)
             size += this.encoder.encode(prev.outerHTML).length - xmlnsLength;
             prev = prev.previousElementSibling;
         }
@@ -153,9 +112,6 @@ class EpubParser {
         while (parent !== null) {
             let parentPrev = parent.previousElementSibling;
             while (parentPrev !== null) {
-                // console.log(parentPrev.outerHTML)
-                // console.log(this.encoder.encode(parentPrev.outerHTML).length - xmlnsLength)
-
                 size += this.encoder.encode(parentPrev.outerHTML).length - xmlnsLength;
                 parentPrev = parentPrev.previousElementSibling;
             }
@@ -167,7 +123,7 @@ class EpubParser {
     /**
      * @param currentFile filepath
      * @param CFI
-     * @return {number} percentage
+     * @return {number} percentage as decimal
      */
     getProgress(currentFile, CFI) {
         let percentage = (this.getPreviousFilesSize(currentFile) + this.getCurrentFileProgress(CFI))/this.getTotalByteLength();
@@ -181,6 +137,8 @@ class EpubParser {
         }
     }
 }
+
+//wait until variable is assigned a value
 function waitFor(variable, callback) {
   const interval = setInterval(function() {
     if (variable!==undefined) {
@@ -198,14 +156,9 @@ function calculateProgress(){
     let data=reader.rendition.currentLocation().end;
     return Math.round(epubParser.getProgress(data.href,data.cfi)*100);
 }
-var epubParser;
-waitFor(reader.book,()=>{
-    epubParser = new EpubParser(reader.book.archive.zip.files);
-});
-/*
-register new event emitter locationchange that fires on urlchange
-source: https://stackoverflow.com/a/52809105/21941129
-*/
+
+// register new event emitter locationchange that fires on urlchange
+// source: https://stackoverflow.com/a/52809105/21941129
 (() => {
     let oldPushState = history.pushState;
     history.pushState = function pushState() {
@@ -225,10 +178,14 @@ source: https://stackoverflow.com/a/52809105/21941129
         window.dispatchEvent(new Event('locationchange'));
     });
 })();
+
+var epubParser;
+waitFor(reader.book,()=>{
+    epubParser = new EpubParser(reader.book.archive.zip.files);
+});
 let progressDiv=document.getElementById("progress");
+
 window.addEventListener('locationchange',()=>{
     let newPos=calculateProgress();
-    console.log(newPos);
     progressDiv.textContent=newPos+"%";
-    //getelement set element value
 });
diff --git a/cps/templates/read.html b/cps/templates/read.html
index cf34249e..20e6d3df 100644
--- a/cps/templates/read.html
+++ b/cps/templates/read.html
@@ -154,5 +154,6 @@
 <script src="{{ url_for('static', filename='js/reading/epub.js') }}"></script>
 <script src="{{ url_for('static', filename='js/reading/epub-progress.js') }}"></script>
 <script src="{{ url_for('static', filename='js/libs/pako.min.js') }}"></script>
+<script src="{{ url_for('static', filename='js/libs/epub-cfi-resolver.js') }}"></script>
 </body>
 </html>