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<!DOCTYPE html> <html> <body> <h1>The input popovertargetaction Attribute</h1> <h1 popover id="myheader">Hello</h1> <input type="button" popovertarget="myheader" popovertargetaction="show" value="Show popover"> <p>Click the button and it will show the popover element.</p> </body> </html>
