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→Use cases for each of the methods
* For a simple virtual keyboard action (send a character and key events w/ each user action), use <code>sendKey()</code>. TODO: should we allow backspace key to be sent from the method? If not, how do send these non-printable characters and it's effect with key events?
**[yxl] I perfer to allowing non-printable character, such as backspace key, to be sent, if there is no security issue. This* would give the IME more flexibility.
* For spellcheck, autocomplete etc, use surrounding text methods.
* For cursor moment helper features, use <code>setSelectionRange()</code> and related attributes.
