Re: [w3ctag/design-reviews] Request for TAG review of Input Events level 1 (#160)

@cynthia Thanks for the detailed feedback!

> Just out of curiosity, there is a specific unusual operation that touches transposing the last two characters which were entered - is this a common OS level primitive operation? It would be interesting to know the use case and rationale behind this is. It feels a bit out of place compared to the other generic operations.

@cynthia We investigated what editing operations are supported by browsers already. We then tried to be consistent in what operations we added [1]. For these first versions of the spec we did not add new editing operations not found in any of the major browsers on any platfform. The transpose example mentioned here is supported in Chrome and Safari on MacOS [2]. Whether this operation really is used and/or useful is a debate that we have chosen not to engage in for the moment. 

The points mention all seem to make sense. I agree that there doesn't need to be a second issue for level 2 as the difference are really minor (the main difference is level 1 doesn't guarantee that a larger number of beforeinput types are cancelable and that level 2 guarantees more input before/input events during IME composition).

[1] For example: if there is a way to delete from caret position to the end of the paragraph, there probably should also be one to delete from caret position to the start of the paragraph.

[2] https://github.com/w3c/editing/issues/148#issue-172992127

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