强烈谴责fps格式内嵌katex-html，div和stylesheet的行为

packages/html2md/lib.ts

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+import 'hydrooj';
+import TurndownService from 'turndown';
+import { JSDOM } from 'jsdom';
+
+const turndownService = new TurndownService();
+
+export function convertHTML(html: string) {
+    const DOM = new JSDOM(html);
+    const eles = DOM.window.document.querySelectorAll('span.katex-mathml');
+    eles.forEach((ele) => {
+        const MathML = ele.innerHTML;
+        ele.parentElement.replaceWith(MathML);
+    });
+    return turndownService.turndown(DOM.serialize());
+}
+
+global.Hydro.lib.convertHTML = convertHTML;

packages/html2md/package.json

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+{
+    "name": "@hydrooj/html2md",
+    "version": "1.0.0",
+    "description": "turn html into markdown",
+    "main": "package.json",
+    "repository": "https://github.com/hydro-dev/Hydro.git",
+    "author": "undefined <masnn0@outlook.com>",
+    "license": "AGPL-3.0-only",
+    "dependencies": {
+        "hydrooj": "^2.12.22",
+        "jsdom": "^16.4.0",
+        "turndown": "^6.0.0"
+    },
+    "devDependencies": {
+        "@types/jsdom": "^16.2.3",
+        "@types/turndown": "^5.0.0"
+    },
+    "scripts": {
+        "build": "tsc",
+        "lint": "eslint . --ext ts --fix"
+    }
+}

packages/html2md/tsconfig.json

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+{
+    "compilerOptions": {
+        "target": "es2019",
+        "module": "commonjs",
+        "esModuleInterop": true,
+        "moduleResolution": "node",
+        "declaration": true,
+        "sourceMap": true,
+        "composite": true,
+        "strictBindCallApply": true,
+        "experimentalDecorators": true,
+        "outDir": ".",
+        "rootDir": "."
+    },
+    "include": [
+        "*.ts"
+    ],
+    "exclude": []
+}