HTML FRAGMENT EDITOR
HTML Fragment Editor allows you to edit HTML fragments of the file loaded to the main Book Designer window. Also it permits to insert new HTML fragments to the loaded file. New fragments can be either typed by yourself or copied from some other html source file.
To edit an existed fragment, select it by the mouse in the main Book Designer window and run HTML Fragment Editor .  Make desired corrections (both the text and the html tags as well can be edited) and press apply. If you want to edit another fragment, you do not need to close HTML Fragment Editor window: just select a new fragment, click on the HTML Fragment Editor window, and the html text of the new fragment will appear in the HTML Fragment Editor window.
To insert a new fragment, click on a point in the main Book Designer window where you want to insert a new fragment and press . Type the html text of new fragment in the HTML Fragment Editor window (or paste it from another html file) and press apply.
BUTTONS
apply: insert the html fragment from HTML Fragment Editor window to the main Book Designer window.
undo: restore previous text in the main Book Designer window.
find: find/replace a text in the HTML Fragment Editor window.
color: refresh colored html syntax in the HTML Fragment Editor window.