Copies the left text field's content without changes into the right text field; this will replace existing text (UNDO possible).
4.3.2 html
Copies the left text field's content into the right text field and converts special characters into html-entities (2). If there already is text in the right text field, it will be replaced.
4.3.3 html formatted
Copies the left text field's content into the right text field and converts special characters into html-entities (2); additional to this, whitespaces, tabulators, and line-breaks are converted to html.
4.3.4 xhtml formatted
Copies the left text field's content into the right text field and converts special characters into html-entities (2); additional to this, whitespaces, tabulators, and line-breaks are converted to xhtml.
The source code will be unformatted afterwards.
Clearing the source code's formatting using xhtml formatted is no mistake: web-browsers accept simple formatting in html as well as in xhtml (independent of the document's declaration): so you can choose freely between html formatted and xhtml formatted. Your decision should depend upon the question whether you want to send the formatted text directly or using a command (i.e. 'document write').
