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

```
Test case:
<input type="text" value="input" /><img src="http://www.w3.org/html/logo/badge/html5-badge-h-solo.png" alt="HTML5 Powered"/><div style="display:none;">display:none</div><div style="visibility:hidden;">visibility:hidden</div><table><caption>caption</caption><tr><td>1</td><td>2</td></tr><tr><td>3</td><td>4</td></tr></table><ol><li>item 1</li><li>item 2</li></ol><p>paragraph 1</p><p>paragraph 2</p>

All browsers:
element.textContent:  "display:nonevisibility:hiddencaption1234item 1item 2paragraph 1paragraph 2"

Chrome 41
selection.toString(): "\ncaption\n1\t2\n3\t4\nitem 1\nitem 2\nparagraph 1\n\nparagraph 2"
element.innerText:    "\ncaption\n1\t2\n3\t4\nitem 1\nitem 2\nparagraph 1\n\nparagraph 2"
clipboardData:        "HTML5 Powered\r\ncaption\r\n1\t2\r\n3\t4\r\nitem 1\r\nitem 2\r\nparagraph 1\r\n\r\nparagraph 2"
dataTransfer:         "HTML5 Powered\r\ncaption\r\n1\t2\r\n3\t4\r\nitem 1\r\nitem 2\r\nparagraph 1\r\n\r\nparagraph 2"
Firefox 37
selection.toString(): "HTML5 Powered\r\ncaption1\t2\r\n3\t4\r\n\r\n    item 1\r\n    item 2\r\n\r\nparagraph 1\r\n\r\nparagraph 2"
element.innerText:    undefined
clipboardData:        "\nHTML5 Powered\ncaption1\t2\n3\t4\n\n    item 1\n    item 2\n\nparagraph 1\n\nparagraph 2"
dataTransfer:         "\r\nHTML5 Powered\r\ncaption1\t2\r\n3\t4\r\n\r\n    item 1\r\n    item 2\r\n\r\nparagraph 1\r\n\r\nparagraph 2"
IE 11
selection.toString(): "display:nonevisibility:hiddencaption1234item 1item 2paragraph 1paragraph 2"
element.innerText:    "display:none\r\n\r\nvisibility:hidden\r\n\r\ncaption\r\n\r\n12\r\n34\r\nitem 1\r\nitem 2\r\n\r\nparagraph 1\r\n\r\nparagraph 2"
clipboardData:        "HTML5 Powered\r\n\r\n\r\n\r\n\r\ncaption\r\n\r\n1 2 \r\n3 4 \r\n1.item 1\r\n2.item 2\r\n\r\nparagraph 1\r\n\r\nparagraph 2\r\n"
dataTransfer:         "HTML5 Powered\r\n\r\n\r\n\r\n\r\ncaption\r\n\r\n1 2 \r\n3 4 \r\nitem 1\r\nitem 2\r\n\r\nparagraph 1\r\n\r\nparagraph 2\r\n"
Opera 12
selection.toString(): "display:nonevisibility:hiddencaption1234item 1item 2paragraph 1paragraph 2"
element.innerText:    "display:nonevisibility:hiddencaption1234item 1item 2paragraph 1paragraph 2"
clipboardData:        "\r\ncaption1\t2\r\n3\t4\r\n\r\nitem 1\r\nitem 2\r\n\r\nparagraph 1\r\n\r\nparagraph 2"
dataTransfer:         "\ncaption1\t2\n3\t4\n\nitem 1\nitem 2\n\nparagraph 1\n\nparagraph 2"

```


---
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https://github.com/w3c/selection-api/issues/7#issuecomment-83945870