chromium/chrome/common/extensions/api/dom.json

// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

[
  {
    "namespace": "dom",
    "description": "Use the <code>chrome.dom</code> API to access special DOM APIs for Extensions",
    "functions": [
      {
        "name": "openOrClosedShadowRoot",
        "description": "Gets the open shadow root or the closed shadow root hosted by the specified element. If the element doesn't attach the shadow root, it will return null.",
        "type": "function",
        "parameters": [
          {
            "name": "element",
            "type": "object",
            "isInstanceOf": "HTMLElement",
            "additionalProperties": { "type": "any" }
          }
        ],
        "returns": {
          "name": "shadowRoot",
          "description": "See <a href='https://developer.mozilla.org/en-US/docs/Web/API/ShadowRoot'>https://developer.mozilla.org/en-US/docs/Web/API/ShadowRoot</a>",
          "type": "object",
          "additionalProperties": { "type": "any" }
        }
      }
    ]
  }
]