I sorry that I missing some words

I am using StandardDialog 

and I trace the porblem of chrom because of running "editor.ExecCommand('new')" before "editor.ExecCommand('InsertDocument')"

How to solve by chrom if not running "editor.ExecCommand('new')" to empty the content before running other command?

and I cannot trace the problem of IE

It still has error "Object doesn't support property or method 'addEventListener'".