VisualEditor/Browser issues

This is a list of issues, by browser, that the VisualEditor team would like to see the browser manufacturers correct. It's sort of a mix of feature requests and bug reports. Include JSFiddles when possible.

Internet Explorer

 * Base64 encoded 1x1 transparent GIF renders red in IE10 when used as img src (used in phantoms)
 * Contenteditable="false" within Contenteditable="true" is still editable. JSFiddle

Mobile Safari

 * Shake to undo
 * No way to prevent (should be able to prevent)
 * No events fired (if shake to undo is not prevented, the undo event should be present and hijackable)
 * No way to disable spellcheck or autocorrect in Contenteditable (works in form fields with proper attributes)