You can insert things like Netscape Resize Fix and Faded text.
Scans the document for broken links and incorrect HTML such as combinable tags and invalidly nested tags, missing titles, missing tags, etc. and displays information. Statistics dialog shows document statistics (words, sentences, paragraphs, etc). CSS Editor that edits CSS files and EVERY BIT of information is neatly displayed! Colour Fader that fades the text you put in between the colours of your choice. Properties dialog lets you see and edit common BODY attributes, background information, META tags and background sounds and scripting settings. You can add or remove browsers and use the one you want for previewing.

CUSTOM FONT! Install to your fonts folder and set WonderHTML to display it in the dialogs!
Reports window can be resized.
Ability to highlight specific files.
AWESOME splash screen and about box.
ScriptMate - with in-built preview of scripts and insert with a single click.
Complete reporting. Shows files in the web with info, status of broken or unknown links in all pages, large files (you can set the size limit) and media-related files in the web.
Nice and useful tip of the day dialog.
Nice looking splash screen, small filesize, light graphics.

Load file from Remote Server! You can load files from remote servers, simultaneously view them in a browser window, and what not. You can import files from other folders, including subfolders! Comes with in-built templates that you can use for creating webs. Current templates include Personal Web, Corporate web, blank web and so on. Custom Help Viewer Integrated into the app. Awesome look! IMPORT FILES! You can import files from other locations (with subfolders) into the current web. ScriptMate complete script manager, lists all the functions in your specified favourite script files and allows you to insert the function body or call in the current document. Helps to maintain a method of storing quickly accessible scripts in an hierarchal manner. Buttons in the HTML toolbar, insert specified text on click.

OPEN FILE FROM CURRENT LINE! The program analyzes the current line to find if it contains a href or src attribute, and if any, opens the document referenced. src attributes are opened in the editor, and href attributes are ShellExecuted!
Auto line indent from previous line's indentation level.
Go to line (w/ all sorts of options).
Configure editors to handle specific file types.
Open a file with the editor you want - *from within WHTML*.
AWESOME file properties window.
Generates list of files in the web - *with subfolders*.
AWESOME TASK MANAGEMENT! *cool*.
LOTS of options, keyboard macros!
Insert date & time (automatically updates on open/save!).
Full find in files feature (with subfolders).
Printing and Print Preview *with headers & footers*.
Useful feature: Goto Last position *upto 25-pos memory*.
Can convert plain URLs to functional links *automatically!*.
Multiple undo-redo buffer can hold 100 actions.
Custom zoom level can be applied to images.
Fast conversion and document outlining.

[Everything according to Sushant S. Pandurangi 2002]