This incompatibility is pointed by W3C's Editing API WG:
https://github.com/w3c/editing/issues/171
Gecko has some specific editing UI of HTML editor.
1. Resiziers of <img>, <table>, absolute positioned elements.
2. Adding new table row/column from buttons.
3. Removing existing table row/column from buttons.
4. Grabber to move absolute positioned element.
Currently, all of those UIs are not implemented by the other browsers.
However, they are available in Gecko by default.
Therefore, web app developers need to disable those features with:
document.execCommand("enableObjectResizing",
false, false); // #1
document.execCommand("enableInlineTableEditing",
false, false); // #2 and #3
So, if web apps don't call them, only Firefox users can modify <img> or
<table> elements as unexpected for their developers.
Additionally, web apps cannot disable only #4.
So, for solving this incompatibility issue, we should:
* Disable those UI by default
* But allow to enable those UI for backward compatibility
* Add new command "enableAbsolutePositionEditing" command for allowing
to enable #4
I'm working on this incompatibility issue in:
https://bugzilla.mozilla.org/show_bug.cgi?id=1449564
--
Masayuki Nakano <masay...@d-toybox.com>
Software Engineer, Mozilla
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