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diff --git a/src/fossil.bootstrap.js b/src/fossil.bootstrap.js
new file mode 100644
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+++ b/src/fossil.bootstrap.js
@@ -0,0 +1,327 @@
+"use strict";
+(function () {
+  /* CustomEvent polyfill, courtesy of Mozilla:
+     https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent/CustomEvent
+  */
+  if(typeof window.CustomEvent === "function") return false;
+  window.CustomEvent = function(event, params) {
+    if(!params) params = {bubbles: false, cancelable: false, detail: null};
+    const evt = document.createEvent('CustomEvent');
+    evt.initCustomEvent( event, !!params.bubbles, !!params.cancelable, params.detail );
+    return evt;
+  };
+})();
+(function(global){
+  /* Bootstrapping bits for the global.fossil object. Must be loaded
+     after style.c:builtin_emit_script_fossil_bootstrap() has
+     initialized that object.
+  */
+
+  const F = global.fossil;
+
+  /** Creates a prototype-less plain object with properties derived
+      from all of its object-type arguments. */
+  F.nu = (...obj)=>Object.assign(Object.create(null),...obj);
+
+  /**
+     Returns the current time in something approximating
+     ISO-8601 format.
+  */
+  const timestring = function f(){
+    if(!f.rx1){
+      f.rx1 = /\.\d+Z$/;
+    }
+    const d = new Date();
+    return d.toISOString().replace(f.rx1,'').split('T').join(' ');
+  };
+
+  /** Returns the local time string of Date object d, defaulting
+      to the current time. */
+  const localTimeString = function ff(d){
+    if(!ff.pad){
+      ff.pad = (x)=>(''+x).length>1 ? x : '0'+x;
+    }
+    d || (d = new Date());
+    return [
+      d.getFullYear(),'-',ff.pad(d.getMonth()+1/*sigh*/),
+      '-',ff.pad(d.getDate()),
+      ' ',ff.pad(d.getHours()),':',ff.pad(d.getMinutes()),
+      ':',ff.pad(d.getSeconds())
+    ].join('');
+  };
+
+  /*
+  ** By default fossil.message() sends its arguments console.debug(). If
+  ** fossil.message.targetElement is set, it is assumed to be a DOM
+  ** element, its innerText gets assigned to the concatenation of all
+  ** arguments (with a space between each), and the CSS 'error' class is
+  ** removed from the object. Pass it a falsy value to clear the target
+  ** element.
+  **
+  ** Returns this object.
+  */
+  F.message = function f(){
+    const args = Array.prototype.slice.call(arguments,0);
+    const tgt = f.targetElement;
+    if(args.length) args.unshift(
+      localTimeString()+':'
+      //timestring(),'UTC:'
+    );
+    if(tgt){
+      tgt.classList.remove('error');
+      tgt.innerText = args.join(' ');
+    }
+    else{
+      if(args.length){
+        args.unshift('Fossil status:');
+        console.debug.apply(console,args);
+      }
+    }
+    return this;
+  };
+  /*
+  ** Set default message.targetElement to #fossil-status-bar, if found.
+  */
+  F.message.targetElement =
+    document.querySelector('#fossil-status-bar');
+  if(F.message.targetElement){
+    F.message.targetElement.addEventListener(
+      'dblclick', ()=>F.message(), false
+    );
+  }
+  /*
+  ** By default fossil.error() sends all arguments to
+  ** console.error(). If fossil.message.targetElement (yes,
+  ** fossil.message) is set, it adds the 'error' CSS class to
+  ** that element and sets its content as defined for message().
+  **
+  ** Returns this object.
+  */
+  F.error = function f(){
+    const args = Array.prototype.slice.call(arguments,0);
+    const tgt = F.message.targetElement;
+    args.unshift(timestring(),'UTC:');
+    if(tgt){
+      tgt.classList.add('error');
+      tgt.innerText = args.join(' ');
+    }else{
+      args.unshift('Fossil error:');
+      console.error.apply(console,args);
+    }
+    return this;
+  };
+
+  /**
+     For each property in the given object, its key/value are encoded
+     for use as URL parameters and the combined string is
+     returned. e.g. {a:1,b:2} encodes to "a=1&b=2".
+
+     If the 2nd argument is an array, each encoded element is appended
+     to that array and tgtArray is returned. The above object would be
+     appended as ['a','=','1','&','b','=','2']. This form is used for
+     building up parameter lists before join('')ing the array to create
+     the result string.
+
+     If passed a truthy 3rd argument, it does not really encode each
+     component - it simply concatenates them together.
+  */
+  F.encodeUrlArgs = function(obj,tgtArray,fakeEncode){
+    if(!obj) return '';
+    const a = (tgtArray instanceof Array) ? tgtArray : [],
+          enc = fakeEncode ? (x)=>x : encodeURIComponent;
+    let k, i = 0;
+    for( k in obj ){
+      if(i++) a.push('&');
+      a.push(enc(k),'=',enc(obj[k]));
+    }
+    return a===tgtArray ? a : a.join('');
+  };
+  /**
+     repoUrl( repoRelativePath [,urlParams] )
+
+     Creates a URL by prepending this.rootPath to the given path
+     (which must be relative from the top of the site, without a
+     leading slash). If urlParams is a string, it must be
+     parameters encoded in the form "key=val&key2=val2..." WITHOUT
+     a leading '?'. If it's an object, all of its properties get
+     appended to the URL in that form.
+  */
+  F.repoUrl = function(path,urlParams){
+    if(!urlParams) return this.rootPath+path;
+    const url=[this.rootPath,path];
+    url.push('?');
+    if('string'===typeof urlParams) url.push(urlParams);
+    else if(urlParams && 'object'===typeof urlParams){
+      this.encodeUrlArgs(urlParams, url);
+    }
+    return url.join('');
+  };
+
+  /**
+     Returns true if v appears to be a plain object.
+  */
+  F.isObject = function(v){
+    return v &&
+      (v instanceof Object) &&
+      ('[object Object]' === Object.prototype.toString.apply(v) );
+  };
+
+  /**
+     For each object argument, this function combines their properties,
+     using a last-one-wins policy, and returns a new object with the
+     combined properties. If passed a single object, it effectively
+     shallowly clones that object.
+  */
+  F.mergeLastWins = function(){
+    var k, o, i;
+    const n = arguments.length, rc={};
+    for(i = 0; i < n; ++i){
+      if(!F.isObject(o = arguments[i])) continue;
+      for( k in o ){
+        if(o.hasOwnProperty(k)) rc[k] = o[k];
+      }
+    }
+    return rc;
+  };
+
+  /**
+     Expects to be passed as hash code as its first argument. It
+     returns a "shortened" form of hash, with a length which depends
+     on the 2nd argument: truthy = fossil.config.hashDigitsUrl, falsy
+     = fossil.config.hashDigits, number == that many digits. The
+     fossil.config values are derived from the 'hash-digits'
+     repo-level config setting or the
+     FOSSIL_HASH_DIGITS_URL/FOSSIL_HASH_DIGITS compile-time options.
+
+     If its first arugment is a non-string, that value is returned
+     as-is.
+  */
+  F.hashDigits = function(hash,forUrl){
+    const n = ('number'===typeof forUrl)
+          ? forUrl : F.config[forUrl ? 'hashDigitsUrl' : 'hashDigits'];
+    return ('string'==typeof hash ? hash.substr(
+      0, n
+    ) : hash);
+  };
+
+  /**
+     Convenience wrapper which adds an onload event listener to the
+     window object. Returns this.
+  */
+  F.onPageLoad = function(callback){
+    window.addEventListener('load', callback, false);
+    return this;
+  };
+
+  /**
+     Convenience wrapper which adds a DOMContentLoadedevent listener
+     to the window object. Returns this.
+  */
+  F.onDOMContentLoaded = function(callback){
+    window.addEventListener('DOMContentLoaded', callback, false);
+    return this;
+  };
+
+  /**
+     Assuming name is a repo-style filename, this function returns
+     a shortened form of that name:
+
+     .../LastDirectoryPart/FilenamePart
+
+     If the name has 0-1 directory parts, it is returned as-is.
+
+     Design note: in practice it is generally not helpful to elide the
+     *last* directory part because embedded docs (in particular) often
+     include x/y/index.md and x/z/index.md, both of which would be
+     shortened to something like x/.../index.md.
+  */
+  F.shortenFilename = function(name){
+    const a = name.split('/');
+    if(a.length<=2) return name;
+    while(a.length>2) a.shift();
+    return '.../'+a.join('/');
+  };
+
+  /**
+     Adds a listener for fossil-level custom events. Events are
+     delivered to their callbacks as CustomEvent objects with a
+     'detail' property holding the event's app-level data.
+
+     The exact events fired differ by page, and not all pages trigger
+     events.
+
+     Pedantic sidebar: the custom event's 'target' property is an
+     unspecified DOM element. Clients must not rely on its value being
+     anything specific or useful.
+
+     Returns this object.
+  */
+  F.page.addEventListener = function f(eventName, callback){
+    if(!f.proxy){
+      f.proxy = document.createElement('span');
+    }
+    f.proxy.addEventListener(eventName, callback, false);
+    return this;
+  };
+
+  /**
+     Internal. Dispatches a new CustomEvent to all listeners
+     registered for the given eventName via
+     fossil.page.addEventListener(), passing on a new CustomEvent with
+     a 'detail' property equal to the 2nd argument. Returns this
+     object.
+  */
+  F.page.dispatchEvent = function(eventName, eventDetail){
+    if(this.addEventListener.proxy){
+      try{
+        this.addEventListener.proxy.dispatchEvent(
+          new CustomEvent(eventName,{detail: eventDetail})
+        );
+      }catch(e){
+        console.error(eventName,"event listener threw:",e);
+      }
+    }
+    return this;
+  };
+
+  /**
+     Sets the innerText of the page's TITLE tag to
+     the given text and returns this object.
+   */
+  F.page.setPageTitle = function(title){
+    const t = document.querySelector('title');
+    if(t) t.innerText = title;
+    return this;
+  };
+
+  /**
+     Returns a function, that, as long as it continues to be invoked,
+     will not be triggered. The function will be called after it stops
+     being called for N milliseconds. If `immediate` is passed, call
+     the callback immediately and hinder future invocations until at
+     least the given time has passed.
+
+     If passed only 1 argument, or passed a falsy 2nd argument,
+     the default wait time set in this function's $defaultDelay
+     property is used.
+
+     Inspiration: underscore.js, by way of https://davidwalsh.name/javascript-debounce-function
+  */
+  F.debounce = function f(func, waitMs, immediate) {
+    var timeoutId;
+    if(!waitMs) waitMs = f.$defaultDelay;
+    return function() {
+      const context = this, args = Array.prototype.slice.call(arguments);
+      const later = function() {
+        timeoutId = undefined;
+        if(!immediate) func.apply(context, args);
+      };
+      const callNow = immediate && !timeoutId;
+      clearTimeout(timeoutId);
+      timeoutId = setTimeout(later, waitMs);
+      if(callNow) func.apply(context, args);
+    };
+  };
+  F.debounce.$defaultDelay = 500 /*arbitrary*/;
+
+})(window);