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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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/* toggless.js                                      Frank Lübeck   */

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/* this file contains two functions:

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   mergeSideTOCHooks:  this changes div.ContSect elements to the class

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                       ContSectClosed and includes a hook to toggle between

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                       ContSectClosed and ContSectOpen. 

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   openclosetoc:       this function does the toggling, the rest is done by

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                       CSS

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*/

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closedTOCMarker = "▶ ";

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openTOCMarker = "▼ ";

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noTOCMarker = "  ";

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/* merge hooks into side toc for opening/closing subsections

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   with openclosetoc   */

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function mergeSideTOCHooks() {

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  var hlist = document.getElementsByTagName("div");

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  for (var i = 0; i < hlist.length; i++) {

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     if (hlist[i].className == "ContSect") {

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       var chlds = hlist[i].childNodes;

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       var el = document.createElement("span");

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       var oncl = document.createAttribute("class");

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       oncl.nodeValue = "toctoggle";

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       el.setAttributeNode(oncl);

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       var cont;

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       if (chlds.length > 2) {

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         var oncl = document.createAttribute("onclick");

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         oncl.nodeValue = "openclosetoc(event)";

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         el.setAttributeNode(oncl);

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         cont = document.createTextNode(closedTOCMarker);

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       } else {

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         cont = document.createTextNode(noTOCMarker);

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       }

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       el.appendChild(cont);

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       hlist[i].firstChild.insertBefore(el, hlist[i].firstChild.firstChild);

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       hlist[i].className = "ContSectClosed";

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     }

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  }

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}

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function openclosetoc (event) {

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  /* first two steps to make it work in most browsers */

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  var evt=window.event || event;

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  if (!evt.target) 

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    evt.target=evt.srcElement;

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  var markClosed = document.createTextNode(closedTOCMarker);

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  var markOpen = document.createTextNode(openTOCMarker);

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  var par = evt.target.parentNode.parentNode;

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  if (par.className == "ContSectOpen") {

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    par.className = "ContSectClosed";

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    evt.target.replaceChild(markClosed, evt.target.firstChild);

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  }

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  else if (par.className == "ContSectClosed") {

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    par.className = "ContSectOpen";

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    evt.target.replaceChild(markOpen, evt.target.firstChild);

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  }

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}

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/* adjust jscontent which is called onload */

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jscontentfuncs.push(mergeSideTOCHooks);

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