Fix removing one <title> renders all previous <title>s

Author: yume-chan

package.json

@@ -40,6 +40,7 @@
     "@babel/preset-env": "7.14.4",
     "@babel/preset-typescript": "7.13.0",
     "@types/jest": "^26.0.23",
+    "babel-jest": "^26.6.3",
     "babel-preset-solid": "^1.8.4",
     "jest": "^26.6.3",
     "rimraf": "^3.0.2",