Allow native spell check correction of words

I came up with a hack that could possibly be used to enable native spell check for browsers that support it: http://codepen.io/csuwldcat/pen/mEzGmP?editors=0010

I noticed that clicks are still registered on the spans of words, so I figured I could clone the word on double click and make the clone contenteditable with spellchecking turned on. From there I mask the original, allow the user to right click the misspelled word, then reflect the change on the original text by copying the corrected text to it.

Start by reviewing the linked CodePen and the editor behavior around word spans, double-clicks, and native contenteditable spell checking. Done means browsers with native spell-check support can offer corrections on a misspelled word and the corrected text is reflected in the original content without disrupting existing clicks.

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