FF: You can't delete placeholder using backspace key

[Jakub Ś]

To reproduce:

1. Open placeholder plugin sample
2. Put cursor behind placeholder and try to delete it.

Result: you can't.

This is actually how Firefox works. It does not allow for removing non-editable elements with backspace key
Insert the below code in HTML page, open it in Firefox and try to delete placeholder.

<div contenteditable="true" style="margin-bottom:25px; border:3px solid black;">
<p>This is a <span contenteditable="false" data-cke-placeholder="1" class="cke_placeholder">[[sample placeholder]]</span>. You are using <a data-cke-saved-href="http://ckeditor.com/" href="http://ckeditor.com/">CKEditor</a>.</p>
<div>

Perhaps CKEditor might introduce some code working around this issue

[Jakub Ś]

Btw. Delete key works fine.

[Piotrek Koszuliński]

Fixed in CKEditor 4.3 beta by using widget system to implement placeholder.