diff --git a/docs/_data/supporters.js b/docs/_data/supporters.js
index 6ee9c712db..d31bebd524 100755
--- a/docs/_data/supporters.js
+++ b/docs/_data/supporters.js
@@ -17,6 +17,7 @@
 
 'use strict';
 
+const {loadImage} = require('canvas');
 const {writeFile, mkdir, rm} = require('fs').promises;
 const {resolve} = require('path');
 const debug = require('debug')('mocha:docs:data:supporters');
@@ -114,6 +115,13 @@ const fetchImage = process.env.MOCHA_DOCS_SKIP_IMAGE_DOWNLOAD
           );
         }
         debug('fetched %s', url);
+        const canvasImage = await loadImage(imageBuf);
+        debug('ok %s', url);
+        supporter.dimensions = {
+          width: canvasImage.width,
+          height: canvasImage.height
+        };
+        // debug('dimensions %s %dw %dh', url, canvasImage.width, canvasImage.height);
         const filePath = resolve(SUPPORTER_IMAGE_PATH, supporter.id + '.png');
         await writeFile(filePath, imageBuf);
         debug('wrote %s', filePath);
diff --git a/docs/_includes/supporters.md b/docs/_includes/supporters.md
index bdc2ee99eb..9ee2b520fe 100644
--- a/docs/_includes/supporters.md
+++ b/docs/_includes/supporters.md
@@ -8,7 +8,7 @@ Use Mocha at Work? Ask your manager or marketing team if they'd help [support](h
     {%- if supporter.website -%}
     <a href="{{ supporter.website }}" target="_blank" rel="noopener">
     {%- endif -%}
-      <div class="sponsor" title="{{ supporter.name }}" style="background-image: url(/images/supporters/{{ supporter.id }}.png?sprite=sponsors)"></div>
+      <div class="sponsor" title="{{ supporter.name }}" style="width: {{ supporter.dimensions.width }}px; background-image: url(/images/supporters/{{ supporter.id }}.png?sprite=sponsors)"></div>
     {%- if supporter.website -%}
     </a>
     {%- endif -%}
diff --git a/docs/css/supporters.css b/docs/css/supporters.css
index b6be634765..42cdbe7adb 100644
--- a/docs/css/supporters.css
+++ b/docs/css/supporters.css
@@ -9,9 +9,6 @@
   -sprite-location: url(/images/sprite-backers.png?pngquant);
   -sprite-image-format: png;
   -sprite-padding: 0 10;
-  background-position: center;
-  background-repeat: no-repeat;
-  background-size: contain;
   width: 32px;
   height: 32px;
 }
diff --git a/package-lock.json b/package-lock.json
index d598a962d7..f69412b755 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -43,7 +43,9 @@
         "@rollup/plugin-json": "^4.1.0",
         "@rollup/plugin-multi-entry": "^4.0.1",
         "@rollup/plugin-node-resolve": "^13.1.3",
+        "assetgraph-builder": "^9.0.0",
         "autoprefixer": "^9.8.6",
+        "canvas": "^2.11.2",
         "chai": "^4.3.4",
         "coffeescript": "^2.6.1",
         "coveralls": "^3.1.1",
@@ -1029,8 +1031,6 @@
       "resolved": "https://registry.npmjs.org/@mapbox/node-pre-gyp/-/node-pre-gyp-1.0.10.tgz",
       "integrity": "sha512-4ySo4CjzStuprMwk35H5pPbkymjv1SF3jGLj6rAHp/xT/RF7TL7bd9CTm1xDY49K2qF7jmR/g7k+SkLETP6opA==",
       "dev": true,
-      "optional": true,
-      "peer": true,
       "dependencies": {
         "detect-libc": "^2.0.0",
         "https-proxy-agent": "^5.0.0",
@@ -2306,9 +2306,7 @@
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/aproba/-/aproba-2.0.0.tgz",
       "integrity": "sha512-lYe4Gx7QT+MKGbDsA+Z+he/Wtef0BiwDOlK/XkBrdfsh9J/jPPXbX0tE9x9cl27Tmu5gg3QUbUrQYa/y+KOHPQ==",
-      "dev": true,
-      "optional": true,
-      "peer": true
+      "dev": true
     },
     "node_modules/arch": {
       "version": "2.2.0",
@@ -2508,8 +2506,6 @@
       "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-2.0.0.tgz",
       "integrity": "sha512-Ci/qENmwHnsYo9xKIcUJN5LeDKdJ6R1Z1j9V/J5wyq8nh/mYPEpIKJbBZXtZjG04HiK7zV/p6Vs9952MrMeUIw==",
       "dev": true,
-      "optional": true,
-      "peer": true,
       "dependencies": {
         "delegates": "^1.0.0",
         "readable-stream": "^3.6.0"
@@ -2523,8 +2519,6 @@
       "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
       "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
       "dev": true,
-      "optional": true,
-      "peer": true,
       "dependencies": {
         "inherits": "^2.0.3",
         "string_decoder": "^1.1.1",
@@ -2588,6 +2582,27 @@
         "node": ">=8"
       }
     },
+    "node_modules/array-find-index": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/array-find-index/-/array-find-index-1.0.2.tgz",
+      "integrity": "sha512-M1HQyIXcBGtVywBt8WVdim+lrNaK7VHp99Qt5pSNziXznKHViIBbXWtfRTpEFpF/c4FdfxNAsCCwPp5phBYJtw==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/array-parallel": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/array-parallel/-/array-parallel-0.1.3.tgz",
+      "integrity": "sha512-TDPTwSWW5E4oiFiKmz6RGJ/a80Y91GuLgUYuLd49+XBS75tYo8PNgaT2K/OxuQYqkoI852MDGBorg9OcUSTQ8w==",
+      "dev": true
+    },
+    "node_modules/array-series": {
+      "version": "0.1.5",
+      "resolved": "https://registry.npmjs.org/array-series/-/array-series-0.1.5.tgz",
+      "integrity": "sha512-L0XlBwfx9QetHOsbLDrE/vh2t018w9462HM3iaFfxRiK83aJjAt/Ja3NMkOW7FICwWTlQBa3ZbL5FKhuQWkDrg==",
+      "dev": true
+    },
     "node_modules/array-union": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/array-union/-/array-union-2.1.0.tgz",
@@ -2774,6 +2789,93 @@
         "workbox-build": "^4.3.1"
       }
     },
+    "node_modules/assetgraph-builder": {
+      "version": "9.2.0",
+      "resolved": "https://registry.npmjs.org/assetgraph-builder/-/assetgraph-builder-9.2.0.tgz",
+      "integrity": "sha512-Vzd5uK8SGIvlh5iwVMxd5lSvvCCSDamLI6LzXCrXqjQQeqTpbsDLISaYkLgxZ4rNmH9l5o2n61TL3i3hpjpXEQ==",
+      "dev": true,
+      "dependencies": {
+        "assetgraph": "7.8.0",
+        "assetgraph-hashfiles": "^1.0.1",
+        "assetgraph-sprite": "^3.2.0",
+        "browserslist": "^4.4.2",
+        "chalk": "^4.0.0",
+        "esanimate": "^2.0.0",
+        "estraverse": "^5.0.0",
+        "extend": "^3.0.0",
+        "gm-papandreou": "^1.23.0-patch1",
+        "impro": "~0.13.0",
+        "jpegtran": "^2.0.0",
+        "lodash": "^4.14.1",
+        "memoizesync": "^1.1.1",
+        "optipng": "^4.1.0",
+        "p-map": "^4.0.0",
+        "passerror": "^1.1.1",
+        "pngcrush": "^3.0.0",
+        "pngquant": "^4.0.0",
+        "urltools": "^0.4.1",
+        "yargs": "^17.1.1"
+      },
+      "bin": {
+        "addIntegrityToForeignRelations": "bin/addIntegrityToForeignRelations",
+        "buildProduction": "bin/buildProduction",
+        "findUnusedSelectors": "bin/findUnusedSelectors",
+        "optimizeImage": "bin/optimizeImage"
+      },
+      "engines": {
+        "node": ">= 4"
+      }
+    },
+    "node_modules/assetgraph-builder/node_modules/cliui": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-8.0.1.tgz",
+      "integrity": "sha512-BSeNnyus75C4//NQ9gQt1/csTXyo/8Sb+afLAkzAptFuMsod9HFokGNudZpi/oQV73hnVK+sR+5PVRMd+Dr7YQ==",
+      "dev": true,
+      "dependencies": {
+        "string-width": "^4.2.0",
+        "strip-ansi": "^6.0.1",
+        "wrap-ansi": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/assetgraph-builder/node_modules/yargs": {
+      "version": "17.7.1",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.1.tgz",
+      "integrity": "sha512-cwiTb08Xuv5fqF4AovYacTFNxk62th7LKJ6BL9IGUpTJrWoU7/7WdQGTP2SjKf1dUNBGzDd28p/Yfs/GI6JrLw==",
+      "dev": true,
+      "dependencies": {
+        "cliui": "^8.0.1",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
+        "require-directory": "^2.1.1",
+        "string-width": "^4.2.3",
+        "y18n": "^5.0.5",
+        "yargs-parser": "^21.1.1"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/assetgraph-builder/node_modules/yargs-parser": {
+      "version": "21.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.1.1.tgz",
+      "integrity": "sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==",
+      "dev": true,
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/assetgraph-hashfiles": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/assetgraph-hashfiles/-/assetgraph-hashfiles-1.1.1.tgz",
+      "integrity": "sha512-VXmY6rxIWXb3h7iTZZGD+0WWfDglxtiIYVjavVBbwpCxPzx88gr4NRbHSyeJtCmd27PzVet59+bDVDvzB7IsSQ==",
+      "dev": true,
+      "dependencies": {
+        "urltools": "^0.4.1"
+      }
+    },
     "node_modules/assetgraph-plugin-sitemap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assetgraph-plugin-sitemap/-/assetgraph-plugin-sitemap-1.0.0.tgz",
@@ -2783,6 +2885,15 @@
         "assetgraph": "^7.0.0"
       }
     },
+    "node_modules/assetgraph-sprite": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/assetgraph-sprite/-/assetgraph-sprite-3.2.1.tgz",
+      "integrity": "sha512-oyL1D3GBe/zrKwDGNap/yTadoMnE+dMTMnjco9BXFJkudPd1Wp16WeiW5e9jURreqcfdzKZctgi3t65RNmgFZA==",
+      "dev": true,
+      "dependencies": {
+        "canvas": "^2.3.1"
+      }
+    },
     "node_modules/assetgraph/node_modules/ansi-styles": {
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
@@ -3186,6 +3297,22 @@
         "tweetnacl": "^0.14.3"
       }
     },
+    "node_modules/bin-build": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/bin-build/-/bin-build-3.0.0.tgz",
+      "integrity": "sha512-jcUOof71/TNAI2uM5uoUaDq2ePcVBQ3R/qhxAz1rX7UfvduAL/RXD3jXzvn8cVcDJdGVkiR1shal3OH0ImpuhA==",
+      "dev": true,
+      "dependencies": {
+        "decompress": "^4.0.0",
+        "download": "^6.2.2",
+        "execa": "^0.7.0",
+        "p-map-series": "^1.0.0",
+        "tempfile": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/bin-check": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/bin-check/-/bin-check-4.1.0.tgz",
@@ -4225,6 +4352,28 @@
         "node": ">=6"
       }
     },
+    "node_modules/camelcase-keys": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/camelcase-keys/-/camelcase-keys-2.1.0.tgz",
+      "integrity": "sha512-bA/Z/DERHKqoEOrp+qeGKw1QlvEQkGZSc0XaY6VnTxZr+Kv1G5zFwttpjv8qxZ/sBPT4nthwZaAcsAZTJlSKXQ==",
+      "dev": true,
+      "dependencies": {
+        "camelcase": "^2.0.0",
+        "map-obj": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/camelcase-keys/node_modules/camelcase": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-2.1.1.tgz",
+      "integrity": "sha512-DLIsRzJVBQu72meAKPkWQOLcujdXT32hwdfnkI1frSiSRMK1MofjKHf+MEx0SB6fjEFXL8fBDv1dKymBlOp4Qw==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/caniuse-api": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/caniuse-api/-/caniuse-api-3.0.0.tgz",
@@ -4263,8 +4412,6 @@
       "integrity": "sha512-ItanGBMrmRV7Py2Z+Xhs7cT+FNt5K0vPL4p9EZ/UX/Mu7hFbkxSjKF2KVtPwX7UYWp7dRKnrTvReflgrItJbdw==",
       "dev": true,
       "hasInstallScript": true,
-      "optional": true,
-      "peer": true,
       "dependencies": {
         "@mapbox/node-pre-gyp": "^1.0.0",
         "nan": "^2.17.0",
@@ -4499,8 +4646,6 @@
       "resolved": "https://registry.npmjs.org/chownr/-/chownr-2.0.0.tgz",
       "integrity": "sha512-bIomtDF5KGpdogkLd9VspvFzk9KfpyyGlS8YFVZl7TGPBHL5snIOnxeshwVgPteQ9b4Eydl+pVbIyE1DcvCWgQ==",
       "dev": true,
-      "optional": true,
-      "peer": true,
       "engines": {
         "node": ">=10"
       }
@@ -4793,8 +4938,6 @@
       "resolved": "https://registry.npmjs.org/color-support/-/color-support-1.1.3.tgz",
       "integrity": "sha512-qiBjkpbMLO/HL68y+lh4q0/O1MZFj2RX6X/KmMa3+gJD3z+WwI1ZzDHysvqHGS3mP6mznPckpXmw1nI9cJjyRg==",
       "dev": true,
-      "optional": true,
-      "peer": true,
       "bin": {
         "color-support": "bin.js"
       }
@@ -5029,9 +5172,13 @@
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
       "integrity": "sha512-ty/fTekppD2fIwRvnZAVdeOiGd1c7YXEixbgJTNzqcxJWKQnjJ/V1bNEEE6hygpM3WjwHFUVK6HTjWSzV4a8sQ==",
-      "dev": true,
-      "optional": true,
-      "peer": true
+      "dev": true
+    },
+    "node_modules/console-stream": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/console-stream/-/console-stream-0.1.1.tgz",
+      "integrity": "sha512-QC/8l9e6ofi6nqZ5PawlDgzmMw3OxIXtvolBzap/F4UDBJlDaZRSNbL/lb41C29FcbSJncBFlJFj2WJoNyZRfQ==",
+      "dev": true
     },
     "node_modules/constant-case": {
       "version": "3.0.4",
@@ -5632,6 +5779,18 @@
       "integrity": "sha512-b0tGHbfegbhPJpxpiBPU2sCkigAqtM9O121le6bbOlgyV+NyGyCmVfJ6QW9eRjz8CpNfWEOYBIMIGRYkLwsIYg==",
       "dev": true
     },
+    "node_modules/currently-unhandled": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/currently-unhandled/-/currently-unhandled-0.4.1.tgz",
+      "integrity": "sha512-/fITjgjGU50vjQ4FH6eUoYu+iUoUKIXws2hL15JJpIR+BbTxaXQsMuuyjtNh2WqsSBS5nsaZHFsFecyw5CCAng==",
+      "dev": true,
+      "dependencies": {
+        "array-find-index": "^1.0.1"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/custom-event": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/custom-event/-/custom-event-1.0.1.tgz",
@@ -5985,9 +6144,7 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
       "integrity": "sha512-bd2L678uiWATM6m5Z1VzNCErI3jiGzt6HGY8OVICs40JQq/HALfbyNJmp0UDakEY4pMMaN0Ly5om/B1VI/+xfQ==",
-      "dev": true,
-      "optional": true,
-      "peer": true
+      "dev": true
     },
     "node_modules/depd": {
       "version": "2.0.0",
@@ -6067,8 +6224,6 @@
       "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-2.0.1.tgz",
       "integrity": "sha512-463v3ZeIrcWtdgIg6vI6XUncguvr2TnGl4SzDXinkt9mSLpBJKXT3mW6xT3VQdDN11+WVs29pgvivTc4Lp8v+w==",
       "dev": true,
-      "optional": true,
-      "peer": true,
       "engines": {
         "node": ">=8"
       }
@@ -6560,6 +6715,58 @@
         "node": ">=8"
       }
     },
+    "node_modules/download": {
+      "version": "6.2.5",
+      "resolved": "https://registry.npmjs.org/download/-/download-6.2.5.tgz",
+      "integrity": "sha512-DpO9K1sXAST8Cpzb7kmEhogJxymyVUd5qz/vCOSyvwtp2Klj2XcDt5YUuasgxka44SxF0q5RriKIwJmQHG2AuA==",
+      "dev": true,
+      "dependencies": {
+        "caw": "^2.0.0",
+        "content-disposition": "^0.5.2",
+        "decompress": "^4.0.0",
+        "ext-name": "^5.0.0",
+        "file-type": "5.2.0",
+        "filenamify": "^2.0.0",
+        "get-stream": "^3.0.0",
+        "got": "^7.0.0",
+        "make-dir": "^1.0.0",
+        "p-event": "^1.0.0",
+        "pify": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/download/node_modules/get-stream": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
+      "integrity": "sha512-GlhdIUuVakc8SJ6kK0zAFbiGzRFzNnY4jUuEbV9UROo4Y+0Ny4fjvcZFVTeDA4odpFyOQzaw6hXukJSq/f28sQ==",
+      "dev": true,
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/download/node_modules/make-dir": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-1.3.0.tgz",
+      "integrity": "sha512-2w31R7SJtieJJnQtGc7RVL2StM2vGYVfqUOvUDxH6bC6aJTxPxTF0GnIgCyu7tjockiUWAYQRbxa7vKn34s5sQ==",
+      "dev": true,
+      "dependencies": {
+        "pify": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/download/node_modules/pify": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
+      "integrity": "sha512-C3FsVNH1udSEX48gGX1xfvwTWfsYWj5U+8/uK15BGzIGrKoUpghX8hWZwa/OFnakBiiVNmBvemTJR5mcy7iPcg==",
+      "dev": true,
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/duplexer": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/duplexer/-/duplexer-0.1.2.tgz",
@@ -6982,6 +7189,16 @@
       "integrity": "sha512-Um/+FxMr9CISWh0bi5Zv0iOD+4cFh5qLeks1qhAopKVAJw3drgKbKySikp7wGhDL0HPeaja0P5ULZrxLkniUVg==",
       "dev": true
     },
+    "node_modules/esanimate": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/esanimate/-/esanimate-2.0.0.tgz",
+      "integrity": "sha512-hUHz2espscjRLQfcpGQuqYY4uDG17/cIddNkbLQw+NROlvgrP39vgXqzKUQBbwvEemnwoQo/Lmhu0msxEHQ+rw==",
+      "dev": true,
+      "dependencies": {
+        "escodegen": "^2.0.0",
+        "esprima": "^4.0.1"
+      }
+    },
     "node_modules/escalade": {
       "version": "3.1.1",
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@@ -7456,6 +7673,12 @@
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-      "dev": true,
-      "optional": true,
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-          "dev": true,
-          "optional": true,
-          "peer": true
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+    "squeak": {
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+      "resolved": "https://registry.npmjs.org/squeak/-/squeak-1.3.0.tgz",
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+        "console-stream": "^0.1.1",
+        "lpad-align": "^1.0.1"
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+        "ansi-styles": {
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+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
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+          "dev": true
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+        "chalk": {
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+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
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+          "requires": {
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+            "escape-string-regexp": "^1.0.2",
+            "has-ansi": "^2.0.0",
+            "strip-ansi": "^3.0.0",
+            "supports-color": "^2.0.0"
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+        "escape-string-regexp": {
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+          "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
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+          "dev": true
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha512-VhumSSbBqDTP8p2ZLKj40UjBCV4+v8bUSEpUb4KjRgWk9pbqGF4REFj6KEagidb2f/M6AzC0EmFyDNGaw9OCzg==",
+          "dev": true,
+          "requires": {
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+        "supports-color": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
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+        }
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       "dev": true
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+    "strip-indent": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-1.0.1.tgz",
+      "integrity": "sha512-I5iQq6aFMM62fBEAIB/hXzwJD6EEZ0xEGCX2t7oXqaKPIRgt4WruAQ285BISgdkP+HLGWyeGmNJcpIwFeRYRUA==",
+      "dev": true,
+      "requires": {
+        "get-stdin": "^4.0.1"
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+      "dependencies": {
+        "get-stdin": {
+          "version": "4.0.1",
+          "resolved": "https://registry.npmjs.org/get-stdin/-/get-stdin-4.0.1.tgz",
+          "integrity": "sha512-F5aQMywwJ2n85s4hJPTT9RPxGmubonuB10MNYo17/xph174n2MIR33HRguhzVag10O/npM7SPk73LMZNP+FaWw==",
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+        }
+      }
+    },
     "strip-json-comments": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.1.tgz",
@@ -35871,8 +37792,6 @@
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@@ -35886,17 +37805,13 @@
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-          "dev": true,
-          "optional": true,
-          "peer": true
+          "dev": true
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         "yallist": {
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-          "dev": true,
-          "optional": true,
-          "peer": true
+          "dev": true
         }
       }
     },
@@ -36026,6 +37941,30 @@
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       }
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+    "temp-dir": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/temp-dir/-/temp-dir-1.0.0.tgz",
+      "integrity": "sha512-xZFXEGbG7SNC3itwBzI3RYjq/cEhBkx2hJuKGIUOcEULmkQExXiHat2z/qkISYsuR+IKumhEfKKbV5qXmhICFQ==",
+      "dev": true
+    },
+    "tempfile": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/tempfile/-/tempfile-2.0.0.tgz",
+      "integrity": "sha512-ZOn6nJUgvgC09+doCEF3oB+r3ag7kUvlsXEGX069QRD60p+P3uP7XG9N2/at+EyIRGSN//ZY3LyEotA1YpmjuA==",
+      "dev": true,
+      "requires": {
+        "temp-dir": "^1.0.0",
+        "uuid": "^3.0.1"
+      },
+      "dependencies": {
+        "uuid": {
+          "version": "3.4.0",
+          "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
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+          "dev": true
+        }
+      }
+    },
     "term-size": {
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       "resolved": "https://registry.npmjs.org/term-size/-/term-size-2.2.1.tgz",
@@ -36297,6 +38236,12 @@
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+    "trim-newlines": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-1.0.0.tgz",
+      "integrity": "sha512-Nm4cF79FhSTzrLKGDMi3I4utBtFv8qKy4sq1enftf2gMdpqI8oVQTAfySkTz5r49giVzDj88SVZXP4CeYQwjaw==",
+      "dev": true
+    },
     "trim-repeated": {
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       "resolved": "https://registry.npmjs.org/trim-repeated/-/trim-repeated-1.0.0.tgz",
@@ -36765,6 +38710,15 @@
         "requires-port": "^1.0.0"
       }
     },
+    "url-parse-lax": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/url-parse-lax/-/url-parse-lax-1.0.0.tgz",
+      "integrity": "sha512-BVA4lR5PIviy2PMseNd2jbFQ+jwSwQGdJejf5ctd1rEXt0Ypd7yanUK9+lYechVlN5VaTJGsu2U/3MDDu6KgBA==",
+      "dev": true,
+      "requires": {
+        "prepend-http": "^1.0.1"
+      }
+    },
     "url-to-options": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/url-to-options/-/url-to-options-1.0.1.tgz",
@@ -37377,8 +39331,6 @@
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       "dev": true,
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-      "peer": true,
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diff --git a/package.json b/package.json
index b9ea327469..1408b8715c 100644
--- a/package.json
+++ b/package.json
@@ -81,7 +81,9 @@
     "@rollup/plugin-json": "^4.1.0",
     "@rollup/plugin-multi-entry": "^4.0.1",
     "@rollup/plugin-node-resolve": "^13.1.3",
+    "assetgraph-builder": "^9.0.0",
     "autoprefixer": "^9.8.6",
+    "canvas": "^2.11.2",
     "chai": "^4.3.4",
     "coffeescript": "^2.6.1",
     "coveralls": "^3.1.1",