[Web] Add auto-formatting to HTML files.

Uses html-eslint for HTML file and eslint-plugin-html for inline
JavaScript.

Use HTML5 (not XHTML), remove CDATA and trailing slashes for self
closing tags.

Add format checks to CI.

3 files changed, 322 insertions, 39 deletions

diff --git a/platform/web/.eslintrc.html.js b/platform/web/.eslintrc.html.js
new file mode 100644
index 0000000000..5cb8de360a
--- /dev/null
+++ b/platform/web/.eslintrc.html.js
@@ -0,0 +1,19 @@
+module.exports = {
+	"plugins": [
+		"html",
+		"@html-eslint",
+	],
+	"parser": "@html-eslint/parser",
+	"extends": ["plugin:@html-eslint/recommended", "./.eslintrc.js"],
+	"rules": {
+		"no-alert": "off",
+		"no-console": "off",
+		"@html-eslint/require-closing-tags": ["error", { "selfClosing": "never" }],
+		"@html-eslint/indent": ["error", "tab"],
+	},
+	"globals": {
+		"Godot": true,
+		"Engine": true,
+		"$GODOT_CONFIG": true,
+	},
+};
diff --git a/platform/web/package-lock.json b/platform/web/package-lock.json
index 9a7d871c64..4c12c8602d 100644
--- a/platform/web/package-lock.json
+++ b/platform/web/package-lock.json
@@ -8,8 +8,13 @@
       "name": "godot",
       "version": "1.0.0",
       "license": "MIT",
+      "dependencies": {
+        "eslint-plugin-html": "^7.1.0"
+      },
       "devDependencies": {
-        "eslint": "^7.28.0",
+        "@html-eslint/eslint-plugin": "^0.15.0",
+        "@html-eslint/parser": "^0.15.0",
+        "eslint": "^7.32.0",
         "eslint-config-airbnb-base": "^14.2.1",
         "eslint-plugin-import": "^2.23.4",
         "jsdoc": "^3.6.7"
@@ -83,9 +88,9 @@
       }
     },
     "node_modules/@eslint/eslintrc": {
-      "version": "0.4.2",
-      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.4.2.tgz",
-      "integrity": "sha512-8nmGq/4ycLpIwzvhI4tNDmQztZ8sp+hI7cyG8i1nQDhkAbRzHpXPidRAHlNvCZQpJTKw5ItIpMw9RSToGF00mg==",
+      "version": "0.4.3",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.4.3.tgz",
+      "integrity": "sha512-J6KFFz5QCYUJq3pf0mjEcCJVERbzv71PUIDczuh9JkwGEzced6CO5ADLHB1rbf/+oPBtoPfMYNOpGDzCANlbXw==",
       "dev": true,
       "dependencies": {
         "ajv": "^6.12.4",
@@ -102,6 +107,47 @@
         "node": "^10.12.0 || >=12.0.0"
       }
     },
+    "node_modules/@html-eslint/eslint-plugin": {
+      "version": "0.15.0",
+      "resolved": "https://registry.npmjs.org/@html-eslint/eslint-plugin/-/eslint-plugin-0.15.0.tgz",
+      "integrity": "sha512-6DUb2ZN1PUlzlNzNj4aBhoObBp3Kl/+YbZ6CnkgFAsQSW0tSFAu7p8WwESkz9RZLZZN9gCUlcaYKJnQjTkmnDA==",
+      "dev": true,
+      "engines": {
+        "node": ">=8.10.0"
+      }
+    },
+    "node_modules/@html-eslint/parser": {
+      "version": "0.15.0",
+      "resolved": "https://registry.npmjs.org/@html-eslint/parser/-/parser-0.15.0.tgz",
+      "integrity": "sha512-fA+HQtWnODhOIK6j1p4XWqltINx7hM0WNNTM2RvlH/2glzeRDCcYq3vEmeQhnytvGocidu4ofTzNk80cLnnyiw==",
+      "dev": true,
+      "dependencies": {
+        "es-html-parser": "^0.0.8"
+      },
+      "engines": {
+        "node": ">=8.10.0"
+      }
+    },
+    "node_modules/@humanwhocodes/config-array": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/config-array/-/config-array-0.5.0.tgz",
+      "integrity": "sha512-FagtKFz74XrTl7y6HCzQpwDfXP0yhxe9lHLD1UZxjvZIcbyRz8zTFF/yYNfSfzU414eDwZ1SrO0Qvtyf+wFMQg==",
+      "dev": true,
+      "dependencies": {
+        "@humanwhocodes/object-schema": "^1.2.0",
+        "debug": "^4.1.1",
+        "minimatch": "^3.0.4"
+      },
+      "engines": {
+        "node": ">=10.10.0"
+      }
+    },
+    "node_modules/@humanwhocodes/object-schema": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/object-schema/-/object-schema-1.2.1.tgz",
+      "integrity": "sha512-ZnQMnLV4e7hDlUvw8H+U8ASL02SS2Gn6+9Ac3wGGLIe7+je2AeAOxPY+izIPJDfFDb7eDjev0Us8MO1iFRN8hA==",
+      "dev": true
+    },
     "node_modules/@types/json5": {
       "version": "0.0.29",
       "resolved": "https://registry.npmjs.org/@types/json5/-/json5-0.0.29.tgz",
@@ -143,9 +189,9 @@
       }
     },
     "node_modules/acorn-jsx": {
-      "version": "5.3.1",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.1.tgz",
-      "integrity": "sha512-K0Ptm/47OKfQRpNQ2J/oIN/3QYiK6FwW+eJbILhsdxh2WTLdl+30o8aGdTbm5JbffpFFAg/g+zi1E+jvJha5ng==",
+      "version": "5.3.2",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.2.tgz",
+      "integrity": "sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==",
       "dev": true,
       "peerDependencies": {
         "acorn": "^6.0.0 || ^7.0.0 || ^8.0.0"
@@ -419,9 +465,9 @@
       }
     },
     "node_modules/debug": {
-      "version": "4.3.1",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.1.tgz",
-      "integrity": "sha512-doEwdvm4PCeK4K3RQN2ZC2BYUBaxwLARCqZmMjtF8a51J2Rb0xpVloFRnCODwqjpwnAoao4pelN8l3RJdv3gRQ==",
+      "version": "4.3.4",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
+      "integrity": "sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==",
       "dev": true,
       "dependencies": {
         "ms": "2.1.2"
@@ -465,6 +511,68 @@
         "node": ">=6.0.0"
       }
     },
+    "node_modules/dom-serializer": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-2.0.0.tgz",
+      "integrity": "sha512-wIkAryiqt/nV5EQKqQpo3SToSOV9J0DnbJqwK7Wv/Trc92zIAYZ4FlMu+JPFW1DfGFt81ZTCGgDEabffXeLyJg==",
+      "dependencies": {
+        "domelementtype": "^2.3.0",
+        "domhandler": "^5.0.2",
+        "entities": "^4.2.0"
+      },
+      "funding": {
+        "url": "https://github.com/cheeriojs/dom-serializer?sponsor=1"
+      }
+    },
+    "node_modules/dom-serializer/node_modules/entities": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-4.4.0.tgz",
+      "integrity": "sha512-oYp7156SP8LkeGD0GF85ad1X9Ai79WtRsZ2gxJqtBuzH+98YUV6jkHEKlZkMbcrjJjIVJNIDP/3WL9wQkoPbWA==",
+      "engines": {
+        "node": ">=0.12"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
+    "node_modules/domelementtype": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-2.3.0.tgz",
+      "integrity": "sha512-OLETBj6w0OsagBwdXnPdN0cnMfF9opN69co+7ZrbfPGrdpPVNBUj02spi6B1N7wChLQiPn4CSH/zJvXw56gmHw==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fb55"
+        }
+      ]
+    },
+    "node_modules/domhandler": {
+      "version": "5.0.3",
+      "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-5.0.3.tgz",
+      "integrity": "sha512-cgwlv/1iFQiFnU96XXgROh8xTeetsnJiDsTc7TYCLFd9+/WNkIqPTxiM/8pSd8VIrhXGTf1Ny1q1hquVqDJB5w==",
+      "dependencies": {
+        "domelementtype": "^2.3.0"
+      },
+      "engines": {
+        "node": ">= 4"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/domhandler?sponsor=1"
+      }
+    },
+    "node_modules/domutils": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/domutils/-/domutils-3.0.1.tgz",
+      "integrity": "sha512-z08c1l761iKhDFtfXO04C7kTdPBLi41zwOZl00WS8b5eiaebNpY00HKbztwBq+e3vyqWNwWF3mP9YLUeqIrF+Q==",
+      "dependencies": {
+        "dom-serializer": "^2.0.0",
+        "domelementtype": "^2.3.0",
+        "domhandler": "^5.0.1"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/domutils?sponsor=1"
+      }
+    },
     "node_modules/emoji-regex": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
@@ -531,6 +639,12 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/es-html-parser": {
+      "version": "0.0.8",
+      "resolved": "https://registry.npmjs.org/es-html-parser/-/es-html-parser-0.0.8.tgz",
+      "integrity": "sha512-kjMH23xhvTBw/7Ve1Dtb/7yZdFajfvwOpdsgRHmnyt8yvTsDJnkFjUgEEaMZFW+e1OhN/eoZrvF9wehq+waTGg==",
+      "dev": true
+    },
     "node_modules/es-to-primitive": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.1.tgz",
@@ -561,13 +675,14 @@
       }
     },
     "node_modules/eslint": {
-      "version": "7.28.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.28.0.tgz",
-      "integrity": "sha512-UMfH0VSjP0G4p3EWirscJEQ/cHqnT/iuH6oNZOB94nBjWbMnhGEPxsZm1eyIW0C/9jLI0Fow4W5DXLjEI7mn1g==",
+      "version": "7.32.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.32.0.tgz",
+      "integrity": "sha512-VHZ8gX+EDfz+97jGcgyGCyRia/dPOd6Xh9yPv8Bl1+SoaIwD+a/vlrOmGRUyOYu7MwUhc7CxqeaDZU13S4+EpA==",
       "dev": true,
       "dependencies": {
         "@babel/code-frame": "7.12.11",
-        "@eslint/eslintrc": "^0.4.2",
+        "@eslint/eslintrc": "^0.4.3",
+        "@humanwhocodes/config-array": "^0.5.0",
         "ajv": "^6.10.0",
         "chalk": "^4.0.0",
         "cross-spawn": "^7.0.2",
@@ -681,6 +796,14 @@
         "ms": "^2.1.1"
       }
     },
+    "node_modules/eslint-plugin-html": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-html/-/eslint-plugin-html-7.1.0.tgz",
+      "integrity": "sha512-fNLRraV/e6j8e3XYOC9xgND4j+U7b1Rq+OygMlLcMg+wI/IpVbF+ubQa3R78EjKB9njT6TQOlcK5rFKBVVtdfg==",
+      "dependencies": {
+        "htmlparser2": "^8.0.1"
+      }
+    },
     "node_modules/eslint-plugin-import": {
       "version": "2.23.4",
       "resolved": "https://registry.npmjs.org/eslint-plugin-import/-/eslint-plugin-import-2.23.4.tgz",
@@ -1005,9 +1128,9 @@
       }
     },
     "node_modules/globals": {
-      "version": "13.9.0",
-      "resolved": "https://registry.npmjs.org/globals/-/globals-13.9.0.tgz",
-      "integrity": "sha512-74/FduwI/JaIrr1H8e71UbDE+5x7pIPs1C2rrwC52SszOo043CsWOZEMW7o2Y58xwm9b+0RBKDxY5n2sUpEFxA==",
+      "version": "13.17.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-13.17.0.tgz",
+      "integrity": "sha512-1C+6nQRb1GwGMKm2dH/E7enFAMxGTmGI7/dEdhy/DNelv85w9B72t3uc5frtMNXIbzrarJJ/lTCjcaZwbLJmyw==",
       "dev": true,
       "dependencies": {
         "type-fest": "^0.20.2"
@@ -1073,6 +1196,35 @@
       "integrity": "sha512-mxIDAb9Lsm6DoOJ7xH+5+X4y1LU/4Hi50L9C5sIswK3JzULS4bwk1FvjdBgvYR4bzT4tuUQiC15FE2f5HbLvYw==",
       "dev": true
     },
+    "node_modules/htmlparser2": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/htmlparser2/-/htmlparser2-8.0.1.tgz",
+      "integrity": "sha512-4lVbmc1diZC7GUJQtRQ5yBAeUCL1exyMwmForWkRLnwyzWBFxN633SALPMGYaWZvKe9j1pRZJpauvmxENSp/EA==",
+      "funding": [
+        "https://github.com/fb55/htmlparser2?sponsor=1",
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/fb55"
+        }
+      ],
+      "dependencies": {
+        "domelementtype": "^2.3.0",
+        "domhandler": "^5.0.2",
+        "domutils": "^3.0.1",
+        "entities": "^4.3.0"
+      }
+    },
+    "node_modules/htmlparser2/node_modules/entities": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-4.4.0.tgz",
+      "integrity": "sha512-oYp7156SP8LkeGD0GF85ad1X9Ai79WtRsZ2gxJqtBuzH+98YUV6jkHEKlZkMbcrjJjIVJNIDP/3WL9wQkoPbWA==",
+      "engines": {
+        "node": ">=0.12"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
     "node_modules/ignore": {
       "version": "4.0.6",
       "resolved": "https://registry.npmjs.org/ignore/-/ignore-4.0.6.tgz",
@@ -2067,7 +2219,7 @@
     "node_modules/sprintf-js": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
-      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
+      "integrity": "sha512-D9cPgkvLlV3t3IzL0D0YLvGA9Ahk4PcvVwUbN0dSGr1aP0Nrt4AEnTUbuGvquEC0mA64Gqt1fzirlRs5ibXx8g==",
       "dev": true
     },
     "node_modules/string-width": {
@@ -2406,9 +2558,9 @@
       "dev": true
     },
     "@eslint/eslintrc": {
-      "version": "0.4.2",
-      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.4.2.tgz",
-      "integrity": "sha512-8nmGq/4ycLpIwzvhI4tNDmQztZ8sp+hI7cyG8i1nQDhkAbRzHpXPidRAHlNvCZQpJTKw5ItIpMw9RSToGF00mg==",
+      "version": "0.4.3",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.4.3.tgz",
+      "integrity": "sha512-J6KFFz5QCYUJq3pf0mjEcCJVERbzv71PUIDczuh9JkwGEzced6CO5ADLHB1rbf/+oPBtoPfMYNOpGDzCANlbXw==",
       "dev": true,
       "requires": {
         "ajv": "^6.12.4",
@@ -2422,6 +2574,38 @@
         "strip-json-comments": "^3.1.1"
       }
     },
+    "@html-eslint/eslint-plugin": {
+      "version": "0.15.0",
+      "resolved": "https://registry.npmjs.org/@html-eslint/eslint-plugin/-/eslint-plugin-0.15.0.tgz",
+      "integrity": "sha512-6DUb2ZN1PUlzlNzNj4aBhoObBp3Kl/+YbZ6CnkgFAsQSW0tSFAu7p8WwESkz9RZLZZN9gCUlcaYKJnQjTkmnDA==",
+      "dev": true
+    },
+    "@html-eslint/parser": {
+      "version": "0.15.0",
+      "resolved": "https://registry.npmjs.org/@html-eslint/parser/-/parser-0.15.0.tgz",
+      "integrity": "sha512-fA+HQtWnODhOIK6j1p4XWqltINx7hM0WNNTM2RvlH/2glzeRDCcYq3vEmeQhnytvGocidu4ofTzNk80cLnnyiw==",
+      "dev": true,
+      "requires": {
+        "es-html-parser": "^0.0.8"
+      }
+    },
+    "@humanwhocodes/config-array": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/config-array/-/config-array-0.5.0.tgz",
+      "integrity": "sha512-FagtKFz74XrTl7y6HCzQpwDfXP0yhxe9lHLD1UZxjvZIcbyRz8zTFF/yYNfSfzU414eDwZ1SrO0Qvtyf+wFMQg==",
+      "dev": true,
+      "requires": {
+        "@humanwhocodes/object-schema": "^1.2.0",
+        "debug": "^4.1.1",
+        "minimatch": "^3.0.4"
+      }
+    },
+    "@humanwhocodes/object-schema": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/object-schema/-/object-schema-1.2.1.tgz",
+      "integrity": "sha512-ZnQMnLV4e7hDlUvw8H+U8ASL02SS2Gn6+9Ac3wGGLIe7+je2AeAOxPY+izIPJDfFDb7eDjev0Us8MO1iFRN8hA==",
+      "dev": true
+    },
     "@types/json5": {
       "version": "0.0.29",
       "resolved": "https://registry.npmjs.org/@types/json5/-/json5-0.0.29.tgz",
@@ -2457,9 +2641,9 @@
       "dev": true
     },
     "acorn-jsx": {
-      "version": "5.3.1",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.1.tgz",
-      "integrity": "sha512-K0Ptm/47OKfQRpNQ2J/oIN/3QYiK6FwW+eJbILhsdxh2WTLdl+30o8aGdTbm5JbffpFFAg/g+zi1E+jvJha5ng==",
+      "version": "5.3.2",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.2.tgz",
+      "integrity": "sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==",
       "dev": true,
       "requires": {}
     },
@@ -2672,9 +2856,9 @@
       }
     },
     "debug": {
-      "version": "4.3.1",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.1.tgz",
-      "integrity": "sha512-doEwdvm4PCeK4K3RQN2ZC2BYUBaxwLARCqZmMjtF8a51J2Rb0xpVloFRnCODwqjpwnAoao4pelN8l3RJdv3gRQ==",
+      "version": "4.3.4",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
+      "integrity": "sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==",
       "dev": true,
       "requires": {
         "ms": "2.1.2"
@@ -2704,6 +2888,46 @@
         "esutils": "^2.0.2"
       }
     },
+    "dom-serializer": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-2.0.0.tgz",
+      "integrity": "sha512-wIkAryiqt/nV5EQKqQpo3SToSOV9J0DnbJqwK7Wv/Trc92zIAYZ4FlMu+JPFW1DfGFt81ZTCGgDEabffXeLyJg==",
+      "requires": {
+        "domelementtype": "^2.3.0",
+        "domhandler": "^5.0.2",
+        "entities": "^4.2.0"
+      },
+      "dependencies": {
+        "entities": {
+          "version": "4.4.0",
+          "resolved": "https://registry.npmjs.org/entities/-/entities-4.4.0.tgz",
+          "integrity": "sha512-oYp7156SP8LkeGD0GF85ad1X9Ai79WtRsZ2gxJqtBuzH+98YUV6jkHEKlZkMbcrjJjIVJNIDP/3WL9wQkoPbWA=="
+        }
+      }
+    },
+    "domelementtype": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-2.3.0.tgz",
+      "integrity": "sha512-OLETBj6w0OsagBwdXnPdN0cnMfF9opN69co+7ZrbfPGrdpPVNBUj02spi6B1N7wChLQiPn4CSH/zJvXw56gmHw=="
+    },
+    "domhandler": {
+      "version": "5.0.3",
+      "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-5.0.3.tgz",
+      "integrity": "sha512-cgwlv/1iFQiFnU96XXgROh8xTeetsnJiDsTc7TYCLFd9+/WNkIqPTxiM/8pSd8VIrhXGTf1Ny1q1hquVqDJB5w==",
+      "requires": {
+        "domelementtype": "^2.3.0"
+      }
+    },
+    "domutils": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/domutils/-/domutils-3.0.1.tgz",
+      "integrity": "sha512-z08c1l761iKhDFtfXO04C7kTdPBLi41zwOZl00WS8b5eiaebNpY00HKbztwBq+e3vyqWNwWF3mP9YLUeqIrF+Q==",
+      "requires": {
+        "dom-serializer": "^2.0.0",
+        "domelementtype": "^2.3.0",
+        "domhandler": "^5.0.1"
+      }
+    },
     "emoji-regex": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
@@ -2758,6 +2982,12 @@
         "unbox-primitive": "^1.0.1"
       }
     },
+    "es-html-parser": {
+      "version": "0.0.8",
+      "resolved": "https://registry.npmjs.org/es-html-parser/-/es-html-parser-0.0.8.tgz",
+      "integrity": "sha512-kjMH23xhvTBw/7Ve1Dtb/7yZdFajfvwOpdsgRHmnyt8yvTsDJnkFjUgEEaMZFW+e1OhN/eoZrvF9wehq+waTGg==",
+      "dev": true
+    },
     "es-to-primitive": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.1.tgz",
@@ -2776,13 +3006,14 @@
       "dev": true
     },
     "eslint": {
-      "version": "7.28.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.28.0.tgz",
-      "integrity": "sha512-UMfH0VSjP0G4p3EWirscJEQ/cHqnT/iuH6oNZOB94nBjWbMnhGEPxsZm1eyIW0C/9jLI0Fow4W5DXLjEI7mn1g==",
+      "version": "7.32.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.32.0.tgz",
+      "integrity": "sha512-VHZ8gX+EDfz+97jGcgyGCyRia/dPOd6Xh9yPv8Bl1+SoaIwD+a/vlrOmGRUyOYu7MwUhc7CxqeaDZU13S4+EpA==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "7.12.11",
-        "@eslint/eslintrc": "^0.4.2",
+        "@eslint/eslintrc": "^0.4.3",
+        "@humanwhocodes/config-array": "^0.5.0",
         "ajv": "^6.10.0",
         "chalk": "^4.0.0",
         "cross-spawn": "^7.0.2",
@@ -2881,6 +3112,14 @@
         }
       }
     },
+    "eslint-plugin-html": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-html/-/eslint-plugin-html-7.1.0.tgz",
+      "integrity": "sha512-fNLRraV/e6j8e3XYOC9xgND4j+U7b1Rq+OygMlLcMg+wI/IpVbF+ubQa3R78EjKB9njT6TQOlcK5rFKBVVtdfg==",
+      "requires": {
+        "htmlparser2": "^8.0.1"
+      }
+    },
     "eslint-plugin-import": {
       "version": "2.23.4",
       "resolved": "https://registry.npmjs.org/eslint-plugin-import/-/eslint-plugin-import-2.23.4.tgz",
@@ -3139,9 +3378,9 @@
       }
     },
     "globals": {
-      "version": "13.9.0",
-      "resolved": "https://registry.npmjs.org/globals/-/globals-13.9.0.tgz",
-      "integrity": "sha512-74/FduwI/JaIrr1H8e71UbDE+5x7pIPs1C2rrwC52SszOo043CsWOZEMW7o2Y58xwm9b+0RBKDxY5n2sUpEFxA==",
+      "version": "13.17.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-13.17.0.tgz",
+      "integrity": "sha512-1C+6nQRb1GwGMKm2dH/E7enFAMxGTmGI7/dEdhy/DNelv85w9B72t3uc5frtMNXIbzrarJJ/lTCjcaZwbLJmyw==",
       "dev": true,
       "requires": {
         "type-fest": "^0.20.2"
@@ -3186,6 +3425,24 @@
       "integrity": "sha512-mxIDAb9Lsm6DoOJ7xH+5+X4y1LU/4Hi50L9C5sIswK3JzULS4bwk1FvjdBgvYR4bzT4tuUQiC15FE2f5HbLvYw==",
       "dev": true
     },
+    "htmlparser2": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/htmlparser2/-/htmlparser2-8.0.1.tgz",
+      "integrity": "sha512-4lVbmc1diZC7GUJQtRQ5yBAeUCL1exyMwmForWkRLnwyzWBFxN633SALPMGYaWZvKe9j1pRZJpauvmxENSp/EA==",
+      "requires": {
+        "domelementtype": "^2.3.0",
+        "domhandler": "^5.0.2",
+        "domutils": "^3.0.1",
+        "entities": "^4.3.0"
+      },
+      "dependencies": {
+        "entities": {
+          "version": "4.4.0",
+          "resolved": "https://registry.npmjs.org/entities/-/entities-4.4.0.tgz",
+          "integrity": "sha512-oYp7156SP8LkeGD0GF85ad1X9Ai79WtRsZ2gxJqtBuzH+98YUV6jkHEKlZkMbcrjJjIVJNIDP/3WL9wQkoPbWA=="
+        }
+      }
+    },
     "ignore": {
       "version": "4.0.6",
       "resolved": "https://registry.npmjs.org/ignore/-/ignore-4.0.6.tgz",
@@ -3936,7 +4193,7 @@
     "sprintf-js": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
-      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
+      "integrity": "sha512-D9cPgkvLlV3t3IzL0D0YLvGA9Ahk4PcvVwUbN0dSGr1aP0Nrt4AEnTUbuGvquEC0mA64Gqt1fzirlRs5ibXx8g==",
       "dev": true
     },
     "string-width": {
diff --git a/platform/web/package.json b/platform/web/package.json
index 8d4983663b..e1dd7b1a22 100644
--- a/platform/web/package.json
+++ b/platform/web/package.json
@@ -5,23 +5,30 @@
   "description": "Development and linting setup for Godot's Web platform code",
   "scripts": {
     "docs": "jsdoc --template js/jsdoc2rst/ js/engine/engine.js js/engine/config.js js/engine/features.js --destination ''",
-    "lint": "npm run lint:engine && npm run lint:libs && npm run lint:modules && npm run lint:tools",
+    "lint": "npm run lint:engine && npm run lint:libs && npm run lint:modules && npm run lint:tools && npm run lint:html",
     "lint:engine": "eslint \"js/engine/*.js\" --no-eslintrc -c .eslintrc.engine.js",
     "lint:libs": "eslint \"js/libs/*.js\" --no-eslintrc -c .eslintrc.libs.js",
     "lint:modules": "eslint \"../../modules/**/*.js\" --no-eslintrc -c .eslintrc.libs.js",
     "lint:tools": "eslint \"js/jsdoc2rst/**/*.js\" --no-eslintrc -c .eslintrc.engine.js",
-    "format": "npm run format:engine && npm run format:libs && npm run format:modules && npm run format:tools",
+    "lint:html": "eslint \"../../misc/dist/html/*.html\" --no-eslintrc -c .eslintrc.html.js",
+    "format": "npm run format:engine && npm run format:libs && npm run format:modules && npm run format:tools && npm run format:html",
     "format:engine": "npm run lint:engine -- --fix",
     "format:libs": "npm run lint:libs -- --fix",
     "format:modules": "npm run lint:modules -- --fix",
-    "format:tools": "npm run lint:tools -- --fix"
+    "format:tools": "npm run lint:tools -- --fix",
+    "format:html": "npm run lint:html -- --fix"
   },
   "author": "Godot Engine contributors",
   "license": "MIT",
   "devDependencies": {
-    "eslint": "^7.28.0",
+    "@html-eslint/eslint-plugin": "^0.15.0",
+    "@html-eslint/parser": "^0.15.0",
+    "eslint": "^7.32.0",
     "eslint-config-airbnb-base": "^14.2.1",
     "eslint-plugin-import": "^2.23.4",
     "jsdoc": "^3.6.7"
+  },
+  "dependencies": {
+    "eslint-plugin-html": "^7.1.0"
   }
 }