[VE][108] Error Message Feedback

Hello,

When validating my index.html page containing a frameset definition, I receive the following error message:
 
Line 26, column 23: there is no attribute "FRAMESPACING"

<frameset framespacing="0" rows="95,*">



But how can this be? I know this attribute exists since I see the difference when I erase it.

Can you please tell me why this is detected as an error?



Thank you