Re: [w3c/selection-api] Add beforeselectionchange event (#56)

For example, when the caret is already after the last character in the editor, if the user still presses the "move-forward" arrow(Say, right/down arrow in a horizontal-tb or vertical-lr editor; or left/down arrow in a vertical-rl editor) to continue moving forward, it will fail, but the developer may sometimes want to be informed of the user's failed attempt. Only then the event can be triggered.

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