HTML style guide?

Is there a style guide for HTML?

Specifically, I'm interested to know if it's acceptible to print
"Trademarked phrase"TM instead of changing the TM to superscript, which 
will make that line in the paragraph space differently than others.

Also, I need to make my client understand the trade-off between a scaled 
table (say, width="85%" ) versus a fixed table...because he wants the 
scalable table but doesn't want his text to scroll when a window becomes 
narrow...

Thanks in advance,
Collette

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