diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -187,7 +187,7 @@
     'rsrc/css/sprite-login.css' => '07052ee0',
     'rsrc/css/sprite-tokens.css' => 'f1896dc5',
     'rsrc/css/syntax/syntax-default.css' => 'c0307dc6',
-    'rsrc/externals/d3/d3.min.js' => '9d068042',
+    'rsrc/externals/d3/d3.min.js' => 'e97b4b78',
     'rsrc/externals/font/fontawesome/fontawesome-webfont.eot' => '23f8c698',
     'rsrc/externals/font/fontawesome/fontawesome-webfont.ttf' => '70983df0',
     'rsrc/externals/font/fontawesome/fontawesome-webfont.woff' => 'cd02f93b',
@@ -558,7 +558,7 @@
     'conpherence-participant-pane-css' => '69e0058a',
     'conpherence-thread-manager' => 'aec8e38c',
     'conpherence-transaction-css' => '3a3f5e7e',
-    'd3' => '9d068042',
+    'd3' => 'e97b4b78',
     'diff-tree-view-css' => 'e2d3e222',
     'differential-changeset-view-css' => '1b0476bc',
     'differential-core-view-css' => '7300a73e',
diff --git a/webroot/rsrc/externals/d3/LICENSE b/webroot/rsrc/externals/d3/LICENSE
--- a/webroot/rsrc/externals/d3/LICENSE
+++ b/webroot/rsrc/externals/d3/LICENSE
@@ -1,4 +1,4 @@
-Copyright 2010-2017 Mike Bostock
+Copyright 2010-2020 Mike Bostock
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification,
diff --git a/webroot/rsrc/externals/d3/README.md b/webroot/rsrc/externals/d3/README.md
--- a/webroot/rsrc/externals/d3/README.md
+++ b/webroot/rsrc/externals/d3/README.md
@@ -6,10 +6,10 @@
 
 ## Resources
 
+* [Introduction](https://observablehq.com/@d3/learn-d3)
 * [API Reference](https://github.com/d3/d3/blob/master/API.md)
-* [Release Notes](https://github.com/d3/d3/releases)
-* [Gallery](https://github.com/d3/d3/wiki/Gallery)
-* [Examples](https://bl.ocks.org/mbostock)
+* [Releases](https://github.com/d3/d3/releases)
+* [Examples](https://observablehq.com/@d3/gallery)
 * [Wiki](https://github.com/d3/d3/wiki)
 
 ## Installing
@@ -17,19 +17,19 @@
 If you use npm, `npm install d3`. Otherwise, download the [latest release](https://github.com/d3/d3/releases/latest). The released bundle supports anonymous AMD, CommonJS, and vanilla environments. You can load directly from [d3js.org](https://d3js.org), [CDNJS](https://cdnjs.com/libraries/d3), or [unpkg](https://unpkg.com/d3/). For example:
 
 ```html
-<script src="https://d3js.org/d3.v5.js"></script>
+<script src="https://d3js.org/d3.v6.js"></script>
 ```
 
 For the minified version:
 
 ```html
-<script src="https://d3js.org/d3.v5.min.js"></script>
+<script src="https://d3js.org/d3.v6.min.js"></script>
 ```
 
 You can also use the standalone D3 microlibraries. For example, [d3-selection](https://github.com/d3/d3-selection):
 
 ```html
-<script src="https://d3js.org/d3-selection.v1.js"></script>
+<script src="https://d3js.org/d3-selection.v2.js"></script>
 ```
 
 D3 is written using [ES2015 modules](http://www.2ality.com/2014/09/es6-modules-final.html). Create a [custom bundle using Rollup](https://bl.ocks.org/mbostock/bb09af4c39c79cffcde4), Webpack, or your preferred bundler. To import D3 into an ES2015 application, either import specific symbols from specific D3 modules:
@@ -47,11 +47,11 @@
 In Node:
 
 ```js
-var d3 = require("d3");
+const d3 = require("d3");
 ```
 
 You can also require individual modules and combine them into a `d3` object using [Object.assign](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign):
 
 ```js
-var d3 = Object.assign({}, require("d3-format"), require("d3-geo"), require("d3-geo-projection"));
+const d3 = Object.assign({}, require("d3-format"), require("d3-geo"), require("d3-geo-projection"));
 ```
diff --git a/webroot/rsrc/externals/d3/d3.min.js b/webroot/rsrc/externals/d3/d3.min.js
--- a/webroot/rsrc/externals/d3/d3.min.js
+++ b/webroot/rsrc/externals/d3/d3.min.js
@@ -2,5 +2,5 @@
  * @provides d3
  * @do-not-minify
  */
-// https://d3js.org v5.9.2 Copyright 2019 Mike Bostock
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e=t/(Math.abs(t)+Math.abs(n));return(n>0?3-e:1+e)/4}(t-this._cx,n-this._cy)*this._hashSize)%this._hashSize}_legalize(t){const{_triangles:n,_halfedges:e,coords:r}=this;let i=0,o=0;for(;;){const a=e[t],u=t-t%3;if(o=u+(t+2)%3,-1===a){if(0===i)break;t=Ra[--i];continue}const c=a-a%3,f=u+(t+1)%3,s=c+(a+2)%3,l=n[o],h=n[t],d=n[f],p=n[s];if(Ba(r[2*l],r[2*l+1],r[2*h],r[2*h+1],r[2*d],r[2*d+1],r[2*p],r[2*p+1])){n[t]=p,n[a]=l;const r=e[s];if(-1===r){let n=this._hullStart;do{if(this._hullTri[n]===s){this._hullTri[n]=t;break}n=this._hullPrev[n]}while(n!==this._hullStart)}this._link(t,r),this._link(a,e[o]),this._link(o,s);const u=c+(a+1)%3;i<Ra.length&&(Ra[i++]=u)}else{if(0===i)break;t=Ra[--i]}}return o}_link(t,n){this._halfedges[t]=n,-1!==n&&(this._halfedges[n]=t)}_addTriangle(t,n,e,r,i,o){const a=this.trianglesLen;return this._triangles[a]=t,this._triangles[a+1]=n,this._triangles[a+2]=e,this._link(a,r),this._link(a+1,i),this._link(a+2,o),this.trianglesLen+=3,a}}function Oa(t,n,e,r){const 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Wa{constructor(t,[n,e,r,i]=[0,0,960,500]){if(!((r=+r)>=(n=+n)&&(i=+i)>=(e=+e)))throw new Error("invalid bounds");this.delaunay=t,this._circumcenters=new Float64Array(2*t.points.length),this.vectors=new Float64Array(2*t.points.length),this.xmax=r,this.xmin=n,this.ymax=i,this.ymin=e,this._init()}update(){return this.delaunay.update(),this._init(),this}_init(){const{delaunay:{points:t,hull:n,triangles:e},vectors:r}=this,i=this.circumcenters=this._circumcenters.subarray(0,e.length/3*2);for(let n,r,o=0,a=0,u=e.length;o<u;o+=3,a+=2){const u=2*e[o],c=2*e[o+1],f=2*e[o+2],s=t[u],l=t[u+1],h=t[c],d=t[c+1],p=t[f],g=t[f+1],y=h-s,v=d-l,_=p-s,b=g-l,m=y*y+v*v,x=_*_+b*b,w=2*(y*b-v*_);if(w)if(Math.abs(w)<1e-8)n=(s+p)/2,r=(l+g)/2;else{const t=1/w;n=s+(b*m-v*x)*t,r=l+(y*x-_*m)*t}else n=(s+p)/2-1e8*b,r=(l+g)/2+1e8*_;i[a]=n,i[a+1]=r}let o,a,u,c=n[n.length-1],f=4*c,s=t[2*c],l=t[2*c+1];r.fill(0);for(let 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u=o;do{const e=Math.floor(u/3);if(a.push(n[2*e],n[2*e+1]),u=u%3==2?u-2:u+1,i[u]!==t)break;u=r[u]}while(u!==o&&-1!==u);return a}_clip(t){if(0===t&&1===this.delaunay.hull.length)return[this.xmax,this.ymin,this.xmax,this.ymax,this.xmin,this.ymax,this.xmin,this.ymin];const n=this._cell(t);if(null===n)return null;const{vectors:e}=this,r=4*t;return e[r]||e[r+1]?this._clipInfinite(t,n,e[r],e[r+1],e[r+2],e[r+3]):this._clipFinite(t,n)}_clipFinite(t,n){const e=n.length;let r,i,o,a,u,c=null,f=n[e-2],s=n[e-1],l=this._regioncode(f,s);for(let h=0;h<e;h+=2)if(r=f,i=s,f=n[h],s=n[h+1],o=l,l=this._regioncode(f,s),0===o&&0===l)a=u,u=0,c?c.push(f,s):c=[f,s];else{let n,e,h,d,p;if(0===o){if(null===(n=this._clipSegment(r,i,f,s,o,l)))continue;[e,h,d,p]=n}else{if(null===(n=this._clipSegment(f,s,r,i,l,o)))continue;[d,p,e,h]=n,a=u,u=this._edgecode(e,h),a&&u&&this._edge(t,a,u,c,c.length),c?c.push(e,h):c=[e,h]}a=u,u=this._edgecode(d,p),a&&u&&this._edge(t,a,u,c,c.length),c?c.push(d,p):c=[d,p]}if(c)a=u,u=this._edgecode(c[0],c[1]),a&&u&&this._edge(t,a,u,c,c.length);else if(this.contains(t,(this.xmin+this.xmax)/2,(this.ymin+this.ymax)/2))return[this.xmax,this.ymin,this.xmax,this.ymax,this.xmin,this.ymax,this.xmin,this.ymin];return c}_clipSegment(t,n,e,r,i,o){for(;;){if(0===i&&0===o)return[t,n,e,r];if(i&o)return null;let a,u,c=i||o;8&c?(a=t+(e-t)*(this.ymax-n)/(r-n),u=this.ymax):4&c?(a=t+(e-t)*(this.ymin-n)/(r-n),u=this.ymin):2&c?(u=n+(r-n)*(this.xmax-t)/(e-t),a=this.xmax):(u=n+(r-n)*(this.xmin-t)/(e-t),a=this.xmin),i?(t=a,n=u,i=this._regioncode(t,n)):(e=a,r=u,o=this._regioncode(e,r))}}_clipInfinite(t,n,e,r,i,o){let a,u=Array.from(n);if((a=this._project(u[0],u[1],e,r))&&u.unshift(a[0],a[1]),(a=this._project(u[u.length-2],u[u.length-1],i,o))&&u.push(a[0],a[1]),u=this._clipFinite(t,u))for(let n,e=0,r=u.length,i=this._edgecode(u[r-2],u[r-1]);e<r;e+=2)n=i,i=this._edgecode(u[e],u[e+1]),n&&i&&(e=this._edge(t,n,i,u,e),r=u.length);else this.contains(t,(this.xmin+this.xmax)/2,(this.ymin+this.ymax)/2)&&(u=[this.xmin,this.ymin,this.xmax,this.ymin,this.xmax,this.ymax,this.xmin,this.ymax]);return u}_edge(t,n,e,r,i){for(;n!==e;){let e,o;switch(n){case 5:n=4;continue;case 4:n=6,e=this.xmax,o=this.ymin;break;case 6:n=2;continue;case 2:n=10,e=this.xmax,o=this.ymax;break;case 10:n=8;continue;case 8:n=9,e=this.xmin,o=this.ymax;break;case 9:n=1;continue;case 1:n=5,e=this.xmin,o=this.ymin}r[i]===e&&r[i+1]===o||!this.contains(t,e,o)||(r.splice(i,0,e,o),i+=2)}if(r.length>4)for(let t=0;t<r.length;t+=2){const n=(t+2)%r.length,e=(t+4)%r.length;(r[t]===r[n]&&r[n]===r[e]||r[t+1]===r[n+1]&&r[n+1]===r[e+1])&&(r.splice(n,2),t-=2)}return i}_project(t,n,e,r){let i,o,a,u=1/0;if(r<0){if(n<=this.ymin)return null;(i=(this.ymin-n)/r)<u&&(a=this.ymin,o=t+(u=i)*e)}else if(r>0){if(n>=this.ymax)return null;(i=(this.ymax-n)/r)<u&&(a=this.ymax,o=t+(u=i)*e)}if(e>0){if(t>=this.xmax)return null;(i=(this.xmax-t)/e)<u&&(o=this.xmax,a=n+(u=i)*r)}else if(e<0){if(t<=this.xmin)return null;(i=(this.xmin-t)/e)<u&&(o=this.xmin,a=n+(u=i)*r)}return[o,a]}_edgecode(t,n){return(t===this.xmin?1:t===this.xmax?2:0)|(n===this.ymin?4:n===this.ymax?8:0)}_regioncode(t,n){return(t<this.xmin?1:t>this.xmax?2:0)|(n<this.ymin?4:n>this.ymax?8:0)}}const Za=2*Math.PI,Ka=Math.pow;function Qa(t){return t[0]}function Ja(t){return t[1]}function tu(t,n,e){return[t+Math.sin(t+n)*e,n+Math.cos(t-n)*e]}class nu{static from(t,n=Qa,e=Ja,r){return new nu("length"in t?function(t,n,e,r){const i=t.length,o=new Float64Array(2*i);for(let a=0;a<i;++a){const 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o=Bb(n,e),a=Bb(n,e=(e+i)/2),u=Bb(r,e),c=Bb(r,i);t.moveTo(o[0],o[1]),t.bezierCurveTo(a[0],a[1],u[0],u[1],c[0],c[1])}Rb.prototype={areaStart:function(){this._curve.areaStart()},areaEnd:function(){this._curve.areaEnd()},lineStart:function(){this._curve.lineStart()},lineEnd:function(){this._curve.lineEnd()},point:function(t,n){this._curve.point(n*Math.sin(t),n*-Math.cos(t))}};var Vb={draw:function(t,n){var e=Math.sqrt(n/hb);t.moveTo(e,0),t.arc(0,0,e,0,pb)}},$b={draw:function(t,n){var e=Math.sqrt(n/5)/2;t.moveTo(-3*e,-e),t.lineTo(-e,-e),t.lineTo(-e,-3*e),t.lineTo(e,-3*e),t.lineTo(e,-e),t.lineTo(3*e,-e),t.lineTo(3*e,e),t.lineTo(e,e),t.lineTo(e,3*e),t.lineTo(-e,3*e),t.lineTo(-e,e),t.lineTo(-3*e,e),t.closePath()}},Wb=Math.sqrt(1/3),Zb=2*Wb,Kb={draw:function(t,n){var e=Math.sqrt(n/Zb),r=e*Wb;t.moveTo(0,-e),t.lineTo(r,0),t.lineTo(0,e),t.lineTo(-r,0),t.closePath()}},Qb=Math.sin(hb/10)/Math.sin(7*hb/10),Jb=Math.sin(pb/10)*Qb,tm=-Math.cos(pb/10)*Qb,nm={draw:function(t,n){var e=Math.sqrt(.8908130915292852*n),r=Jb*e,i=tm*e;t.moveTo(0,-e),t.lineTo(r,i);for(var o=1;o<5;++o){var a=pb*o/5,u=Math.cos(a),c=Math.sin(a);t.lineTo(c*e,-u*e),t.lineTo(u*r-c*i,c*r+u*i)}t.closePath()}},em={draw:function(t,n){var e=Math.sqrt(n),r=-e/2;t.rect(r,r,e,e)}},rm=Math.sqrt(3),im={draw:function(t,n){var e=-Math.sqrt(n/(3*rm));t.moveTo(0,2*e),t.lineTo(-rm*e,-e),t.lineTo(rm*e,-e),t.closePath()}},om=-.5,am=Math.sqrt(3)/2,um=1/Math.sqrt(12),cm=3*(um/2+1),fm={draw:function(t,n){var e=Math.sqrt(n/cm),r=e/2,i=e*um,o=r,a=e*um+e,u=-o,c=a;t.moveTo(r,i),t.lineTo(o,a),t.lineTo(u,c),t.lineTo(om*r-am*i,am*r+om*i),t.lineTo(om*o-am*a,am*o+om*a),t.lineTo(om*u-am*c,am*u+om*c),t.lineTo(om*r+am*i,om*i-am*r),t.lineTo(om*o+am*a,om*a-am*o),t.lineTo(om*u+am*c,om*c-am*u),t.closePath()}},sm=[Vb,$b,Kb,em,nm,im,fm];function lm(){}function hm(t,n,e){t._context.bezierCurveTo((2*t._x0+t._x1)/3,(2*t._y0+t._y1)/3,(t._x0+2*t._x1)/3,(t._y0+2*t._y1)/3,(t._x0+4*t._x1+n)/6,(t._y0+4*t._y1+e)/6)}function dm(t){this._context=t}function pm(t){this._context=t}function gm(t){this._context=t}dm.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._x0=this._x1=this._y0=this._y1=NaN,this._point=0},lineEnd:function(){switch(this._point){case 3:hm(this,this._x1,this._y1);case 2:this._context.lineTo(this._x1,this._y1)}(this._line||0!==this._line&&1===this._point)&&this._context.closePath(),this._line=1-this._line},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1,this._line?this._context.lineTo(t,n):this._context.moveTo(t,n);break;case 1:this._point=2;break;case 2:this._point=3,this._context.lineTo((5*this._x0+this._x1)/6,(5*this._y0+this._y1)/6);default:hm(this,t,n)}this._x0=this._x1,this._x1=t,this._y0=this._y1,this._y1=n}},pm.prototype={areaStart:lm,areaEnd:lm,lineStart:function(){this._x0=this._x1=this._x2=this._x3=this._x4=this._y0=this._y1=this._y2=this._y3=this._y4=NaN,this._point=0},lineEnd:function(){switch(this._point){case 1:this._context.moveTo(this._x2,this._y2),this._context.closePath();break;case 2:this._context.moveTo((this._x2+2*this._x3)/3,(this._y2+2*this._y3)/3),this._context.lineTo((this._x3+2*this._x2)/3,(this._y3+2*this._y2)/3),this._context.closePath();break;case 3:this.point(this._x2,this._y2),this.point(this._x3,this._y3),this.point(this._x4,this._y4)}},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1,this._x2=t,this._y2=n;break;case 1:this._point=2,this._x3=t,this._y3=n;break;case 2:this._point=3,this._x4=t,this._y4=n,this._context.moveTo((this._x0+4*this._x1+t)/6,(this._y0+4*this._y1+n)/6);break;default:hm(this,t,n)}this._x0=this._x1,this._x1=t,this._y0=this._y1,this._y1=n}},gm.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._x0=this._x1=this._y0=this._y1=NaN,this._point=0},lineEnd:function(){(this._line||0!==this._line&&3===this._point)&&this._context.closePath(),this._line=1-this._line},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1;break;case 1:this._point=2;break;case 2:this._point=3;var e=(this._x0+4*this._x1+t)/6,r=(this._y0+4*this._y1+n)/6;this._line?this._context.lineTo(e,r):this._context.moveTo(e,r);break;case 3:this._point=4;default:hm(this,t,n)}this._x0=this._x1,this._x1=t,this._y0=this._y1,this._y1=n}};class 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3:this.point(this._x3,this._y3),this.point(this._x4,this._y4),this.point(this._x5,this._y5)}},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1,this._x3=t,this._y3=n;break;case 1:this._point=2,this._context.moveTo(this._x4=t,this._y4=n);break;case 2:this._point=3,this._x5=t,this._y5=n;break;default:bm(this,t,n)}this._x0=this._x1,this._x1=this._x2,this._x2=t,this._y0=this._y1,this._y1=this._y2,this._y2=n}};var Mm=function t(n){function e(t){return new wm(t,n)}return e.tension=function(n){return t(+n)},e}(0);function Am(t,n){this._context=t,this._k=(1-n)/6}Am.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._x0=this._x1=this._x2=this._y0=this._y1=this._y2=NaN,this._point=0},lineEnd:function(){(this._line||0!==this._line&&3===this._point)&&this._context.closePath(),this._line=1-this._line},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1;break;case 1:this._point=2;break;case 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Em(t,n){this._context=t,this._alpha=n}Em.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._x0=this._x1=this._x2=this._y0=this._y1=this._y2=NaN,this._l01_a=this._l12_a=this._l23_a=this._l01_2a=this._l12_2a=this._l23_2a=this._point=0},lineEnd:function(){switch(this._point){case 2:this._context.lineTo(this._x2,this._y2);break;case 3:this.point(this._x2,this._y2)}(this._line||0!==this._line&&1===this._point)&&this._context.closePath(),this._line=1-this._line},point:function(t,n){if(t=+t,n=+n,this._point){var e=this._x2-t,r=this._y2-n;this._l23_a=Math.sqrt(this._l23_2a=Math.pow(e*e+r*r,this._alpha))}switch(this._point){case 0:this._point=1,this._line?this._context.lineTo(t,n):this._context.moveTo(t,n);break;case 1:this._point=2;break;case 2:this._point=3;default:Sm(this,t,n)}this._l01_a=this._l12_a,this._l12_a=this._l23_a,this._l01_2a=this._l12_2a,this._l12_2a=this._l23_2a,this._x0=this._x1,this._x1=this._x2,this._x2=t,this._y0=this._y1,this._y1=this._y2,this._y2=n}};var km=function t(n){function e(t){return n?new Em(t,n):new mm(t,0)}return e.alpha=function(n){return t(+n)},e}(.5);function Nm(t,n){this._context=t,this._alpha=n}Nm.prototype={areaStart:lm,areaEnd:lm,lineStart:function(){this._x0=this._x1=this._x2=this._x3=this._x4=this._x5=this._y0=this._y1=this._y2=this._y3=this._y4=this._y5=NaN,this._l01_a=this._l12_a=this._l23_a=this._l01_2a=this._l12_2a=this._l23_2a=this._point=0},lineEnd:function(){switch(this._point){case 1:this._context.moveTo(this._x3,this._y3),this._context.closePath();break;case 2:this._context.lineTo(this._x3,this._y3),this._context.closePath();break;case 3:this.point(this._x3,this._y3),this.point(this._x4,this._y4),this.point(this._x5,this._y5)}},point:function(t,n){if(t=+t,n=+n,this._point){var e=this._x2-t,r=this._y2-n;this._l23_a=Math.sqrt(this._l23_2a=Math.pow(e*e+r*r,this._alpha))}switch(this._point){case 0:this._point=1,this._x3=t,this._y3=n;break;case 1:this._point=2,this._context.moveTo(this._x4=t,this._y4=n);break;case 2:this._point=3,this._x5=t,this._y5=n;break;default:Sm(this,t,n)}this._l01_a=this._l12_a,this._l12_a=this._l23_a,this._l01_2a=this._l12_2a,this._l12_2a=this._l23_2a,this._x0=this._x1,this._x1=this._x2,this._x2=t,this._y0=this._y1,this._y1=this._y2,this._y2=n}};var Cm=function t(n){function e(t){return n?new Nm(t,n):new wm(t,0)}return e.alpha=function(n){return t(+n)},e}(.5);function 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Jm(t,{sourceEvent:this.sourceEvent,target:y,type:t,transform:this.that.__zoom,dispatch:h}),n)}},y.wheelDelta=function(t){return arguments.length?(a="function"==typeof t?t:Qm(+t),y):a},y.filter=function(t){return arguments.length?(r="function"==typeof t?t:Qm(!!t),y):r},y.touchable=function(t){return arguments.length?(u="function"==typeof t?t:Qm(!!t),y):u},y.extent=function(t){return arguments.length?(i="function"==typeof t?t:Qm([[+t[0][0],+t[0][1]],[+t[1][0],+t[1][1]]]),y):i},y.scaleExtent=function(t){return arguments.length?(c[0]=+t[0],c[1]=+t[1],y):[c[0],c[1]]},y.translateExtent=function(t){return arguments.length?(f[0][0]=+t[0][0],f[1][0]=+t[1][0],f[0][1]=+t[0][1],f[1][1]=+t[1][1],y):[[f[0][0],f[0][1]],[f[1][0],f[1][1]]]},y.constrain=function(t){return arguments.length?(o=t,y):o},y.duration=function(t){return arguments.length?(s=+t,y):s},y.interpolate=function(t){return arguments.length?(l=t,y):l},y.on=function(){var t=h.on.apply(h,arguments);return t===h?y:t},y.clickDistance=function(t){return arguments.length?(p=(t=+t)*t,y):Math.sqrt(p)},y.tapDistance=function(t){return arguments.length?(g=+t,y):g},y},t.zoomIdentity=nx,t.zoomTransform=ex,Object.defineProperty(t,"__esModule",{value:!0})}));
diff --git a/webroot/rsrc/js/application/fact/Chart.js b/webroot/rsrc/js/application/fact/Chart.js
--- a/webroot/rsrc/js/application/fact/Chart.js
+++ b/webroot/rsrc/js/application/fact/Chart.js
@@ -188,7 +188,7 @@
           .attr('r', 3)
           .attr('cx', function(d) { return x(to_date(d.x)); })
           .attr('cy', function(d) { return y(d.y1); })
-          .on('mouseover', function(d) {
+          .on('mouseover', function(event, d) {
             var dd = to_date(d.x);
 
             var d_y = dd.getFullYear();
@@ -215,8 +215,8 @@
             div
               .html(view)
               .style('opacity', 0.9)
-              .style('left', (d3.event.pageX - 60) + 'px')
-              .style('top', (d3.event.pageY - 38) + 'px');
+              .style('left', (event.pageX - 60) + 'px')
+              .style('top', (event.pageY - 38) + 'px');
             })
           .on('mouseout', function() {
             div.style('opacity', 0);