contentEditable doesn't wrap elements around content until after the first line

• Component: HTML Editing
• Status: NEW ---

[Tim McConnell]

For a new contentEditable region, only the second line will be wrapped in a container element (e.g. div or p).

Repro steps:
1) Navigate to http://www.mozilla.org/editor/midasdemo/
2) Click into the CE region and type a line
3) Hit enter and type another line
4) Click "View HTML Source"

Actual: You will see that the first line is not contained in the relevant line element.

Expected: The first line, like the second line, has been wrapped in the editor's line element.

Problem: Because content is not uniformly wrapped, operations that should apply to the current line/block will fail on the first line. Any attempt to walk the DOM to find the parent will reach the contentEditable root.

[Aryeh Gregor]

I specced IE/Opera's behavior, which is to wrap every line in a <p>, including the current one as soon as the user hits enter:

http://aryeh.name/spec/editing/editing.html#the-insertparagraph-command

The relevant case is "If container is not editable or not in the same editing host as node or is not a single-line container:".  This basically wraps the current line in a <p>, although admittedly that's unlikely to be clear on a casual read.

I specced it this way because I agree that it's useful for every line to have a wrapper, so that they can be handled consistently.