In forms 10.1 I have a form with a "check all" or "clear all" for a section of checkboxes that worked perfectly; however, I'm testing it in our DEV environment and the copied form's buttons are not showing now - only the html code.
<p><button onclick="checkAll()" type="button">Check All</button>&nbsp;&nbsp;&nbsp;<button onclick="clearAll()" type="button">Clear All</button>.<br></p>
Same in both environments