[selection-api] Make caret displayable before, after and in-between stub-elements as well as non-editable elements within editable contexts (#47)

Different browsers currently have different issues with this. The only stub element that they all seem to be able to navigate around are IMGs. Others, such as SVGs or Canvas-elements are only handled correctly in some browsers and not in others. Also, carets should be able to be displayed before, after and in-between non-editable elements  and non-editable elements with editable islands. 

See also https://bugzilla.mozilla.org/show_bug.cgi?id=873883

And discussion starting in https://github.com/w3c/editing/issues/58#issuecomment-108652046

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Reply to this email directly or view it on GitHub:
https://github.com/w3c/selection-api/issues/47