Edit fiddle - JSFiddle - React, Tailwind, and code Playground

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HTML

<form action="../" onsubmit="if(document.getElementById('agree').checked) { return true; } else { alert('please agree'); return false; }">
    <input type="checkbox" name="checkbox" value="check" id="agree" />
    <input type="submit" name="email_submit" value="submit" />
</form>

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JSFiddle - React, Tailwind, and code Playground

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Join the 4+ million users, and keep the JSFiddle dream alive.

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Use pre-released features

Fiddle collections

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Console