"x-use-null-cells" argument in HTML table tag?

["Polashek, Emil" <polashek -at- ugs -dot- com>]

Please tell me, if you can, something about the "x-use-null-cells"
argument for an HTML <table> tag. 

I am interested in learning what effect, if any, the bit of code
"x-use-null-cells" has, as it appears in every table tag generated by
the RoboHelp editor. My experimentation and searching have been
fruitless so far.

---Background--- 

I ran into some compressed HTML issues with table formats. I've worked
out a set of things that occur when compressing an HTML file created in
the RoboHelp HTML WYSIWYG editor into a CHM file: 

- Comments are removed 

- Meta tags specific to RoboHelp are removed 

- An embedded "hcp" style sheet is created with styles for any "style="
formatting. 

- "style=" formatting is replaced with with "class=" styles. 

I'm also a little curious about whether this behavior is specific to a
RoboHelp compressor, or is part of Microsoft's HTML Help Workshop
compiler. 


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