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You cannot do this with html *instruction* pages (i.e., <htmlpage>). You can do this using standard <trial> elements displaying a <html> stimulus. Your buttons then would be just standard <text> elements displayed by the <trial> and clickable via the mouse (/inputdevice = mouse; /valdidresponse = (button1, button2, button3); etc.).
The agree to participate vs. decline to participate logic then would be accomplished via /branch, /skip and/or /stop attributes.
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