Re: [whatwg/dom] Proposal: new API to get text content across shadowRoot (Issue #1395)

woody-li left a comment (whatwg/dom#1395)

@rniwa Yeah, it is.

This proposal is meant to resolve how to get text content across shadowRoot.
Both `innerText` and `textContent` cannot get text across shadow DOM.

For example:
```HTML
<div id="box">
  // some other elements.
  <my-element>
    #shadow-fragment
        <span>Some test content</span>
  </my-element>
</div>
```

In some cases, I want to get the real text content of the box element.
I have to query every element, check whether it's a custom element, and collect its inner elements again and again.
Then, use all elements to map a list of text content.

----

This proposal is meant to create a new API like `getTextContent`, using it to get the real text content.
And I think it should contain an options object argument.
One option for deciding whether to get text across shadowRoot.
One option is to get `innerText` or `textContent`.

----

This is my first proposal here.
Please let me know if there's any problem.
Thanks.


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