UNCONFIRMED111580
execCommand("justifycenter") will remove classes and data- attributes, and use the elements computed style as an inline style 
https://bugs.webkit.org/show_bug.cgi?id=111580
Summary execCommand("justifycenter") will remove classes and data- attributes, and us...
Thomas Jones
Reported 2013-03-06 07:41:33 PST
This is an issue with commandidentifiers justifycenter, justifyleft (when the content is not by default left-justified), justifyright, justifyfull, insertorderedlist, and insertunorderedlist Repro: http://jsfiddle.net/tomprogramming/mV9E4/ If you make a selection containing the first line (level1) and apply "justifycenter" to it, the class of level1 goes away, along with any data- attributes on the element, and the computed style of the element is inlined in the style attribute. If an element is already wrapped inside a <div> tag, this does not occur, but the first element inside a contenteditable tag seems to never be wrapped in a div. If you delete everything in the editable box and start typing, the tags that appear (if any) is just either a text node, or a <span>.
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