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There is a newer version: 24.5.4
{
  "$schema": "https://json.schemastore.org/web-types",
  "name": "@vaadin/menu-bar",
  "version": "24.4.7",
  "description-markup": "markdown",
  "framework": "lit",
  "framework-config": {
    "enable-when": {
      "node-packages": [
        "lit"
      ]
    }
  },
  "contributions": {
    "html": {
      "elements": [
        {
          "name": "vaadin-menu-bar",
          "description": "`` is a Web Component providing a set of horizontally stacked buttons offering\nthe user quick access to a consistent set of commands. Each button can toggle a submenu with\nsupport for additional levels of nested menus.\n\nTo create the menu bar, first add the component to the page:\n\n```\n\n```\n\nAnd then use [`items`](https://cdn.vaadin.com/vaadin-web-components/24.4.7/#/elements/vaadin-menu-bar#property-items) property to initialize the structure:\n\n```\ndocument.querySelector('vaadin-menu-bar').items = [{text: 'File'}, {text: 'Edit'}];\n```\n\n### Styling\n\nThe following shadow DOM parts are exposed for styling:\n\nPart name         | Description\n------------------|----------------\n`container`       | The container wrapping menu bar buttons.\n\nThe following state attributes are available for styling:\n\nAttribute           | Description\n--------------------|----------------------------------\n`disabled`          | Set when the menu bar is disabled\n`has-single-button` | Set when there is only one button visible\n\nSee [Styling Components](https://vaadin.com/docs/latest/styling/styling-components) documentation.\n\n### Internal components\n\nIn addition to `` itself, the following internal\ncomponents are themable:\n\n- `` - has the same API as [``](https://cdn.vaadin.com/vaadin-web-components/24.4.7/#/elements/vaadin-button).\n- `` - has the same API as [``](https://cdn.vaadin.com/vaadin-web-components/24.4.7/#/elements/vaadin-item).\n- `` - has the same API as [``](https://cdn.vaadin.com/vaadin-web-components/24.4.7/#/elements/vaadin-list-box).\n- `` - has the same API as [``](https://cdn.vaadin.com/vaadin-web-components/24.4.7/#/elements/vaadin-overlay).",
          "extension": true,
          "attributes": [
            {
              "name": "?disabled",
              "description": "If true, the user cannot interact with this element.",
              "value": {
                "kind": "expression"
              }
            },
            {
              "name": "?openOnHover",
              "description": "If true, the submenu will open on hover (mouseover) instead of click.",
              "value": {
                "kind": "expression"
              }
            },
            {
              "name": "?reverseCollapse",
              "description": "If true, the buttons will be collapsed into the overflow menu\nstarting from the \"start\" end of the bar instead of the \"end\".",
              "value": {
                "kind": "expression"
              }
            },
            {
              "name": ".items",
              "description": "Defines a hierarchical structure, where root level items represent menu bar buttons,\nand `children` property configures a submenu with items to be opened below\nthe button on click, Enter, Space, Up and Down arrow keys.\n\n#### Example\n\n```js\nmenubar.items = [\n  {\n    text: 'File',\n    className: 'file',\n    children: [\n      {text: 'Open', className: 'file open'}\n      {text: 'Auto Save', checked: true},\n    ]\n  },\n  {component: 'hr'},\n  {\n    text: 'Edit',\n    children: [\n      {text: 'Undo', disabled: true},\n      {text: 'Redo'}\n    ]\n  },\n  {text: 'Help'}\n];\n```",
              "value": {
                "kind": "expression"
              }
            },
            {
              "name": ".i18n",
              "description": "The object used to localize this component.\nTo change the default localization, replace the entire\n`i18n` object with a custom one.\n\nTo update individual properties, extend the existing i18n object like so:\n```\nmenuBar.i18n = {\n  ...menuBar.i18n,\n  moreOptions: 'More options'\n}\n```\n\nThe object has the following JSON structure and default values:\n```\n{\n  moreOptions: 'More options'\n}\n```",
              "value": {
                "kind": "expression"
              }
            },
            {
              "name": ".overlayClass",
              "description": "A space-delimited list of CSS class names\nto set on each sub-menu overlay element.",
              "value": {
                "kind": "expression"
              }
            },
            {
              "name": "@item-selected",
              "description": "Fired when either a submenu item or menu bar button without nested children is clicked.",
              "value": {
                "kind": "expression"
              }
            }
          ]
        }
      ]
    }
  }
}