element-spacing

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "element-spacing",
  "description": "page css ruler;page measure tools;Get page's/element's size/margin/padding/spacing info",
  "version": "1.0",
  "manifest_version": 3,
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./spacing.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "permissions": [],
  "action": {
    "default_title": "element spacing",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/images/icon_16.png",
      "32": "/images/icon_32.png",
      "48": "/images/icon_64.png",
      "128": "/images/icon_128.png"
    }
  }
}