[Feature Request] Change content in Shadow DOM

Hi, 

Does demo monkey support changing text within shadow DOM elements? 

Looks like the shadow DOM elements do not allow me to change any text on the screen.

For example:
```
<div id="grid section 1">
  #shadow-root (open)
  <span id="span_1">This is span 1</span>
  <span id="span_2">This is span 2</span>
</div>
```

Thanks.