Re: [selection-api] Selection.toString is under specified (#7)

```
<table><tr><td>11</td><td>12</td></tr><tr><td>21</td><td>22</td></tr></table>
```

`selection.toString()` produces:
```
11 12
21 22
```

`selection.getRangeAt(0).toString()` produces: 
```
11122122
```


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https://github.com/w3c/selection-api/issues/7#issuecomment-81850280